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Файл: concrete5.7.5.6/concrete/vendor/doctrine/orm/lib/Doctrine/ORM/UnitOfWork.php
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<?php
/*
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the MIT license. For more information, see
 * <http://www.doctrine-project.org>.
 */

namespace DoctrineORM;

use 
Exception;
use 
InvalidArgumentException;
use 
UnexpectedValueException;

use 
DoctrineCommonCollectionsArrayCollection;
use 
DoctrineCommonCollectionsCollection;
use 
DoctrineCommonNotifyPropertyChanged;
use 
DoctrineCommonPropertyChangedListener;
use 
DoctrineCommonPersistenceObjectManagerAware;
use 
DoctrineORMMappingClassMetadata;
use 
DoctrineORMProxyProxy;

use 
DoctrineORMEventLifecycleEventArgs;
use 
DoctrineORMEventPreUpdateEventArgs;
use 
DoctrineORMEventPreFlushEventArgs;
use 
DoctrineORMEventOnFlushEventArgs;
use 
DoctrineORMEventPostFlushEventArgs;
use 
DoctrineORMEventListenersInvoker;

/**
 * The UnitOfWork is responsible for tracking changes to objects during an
 * "object-level" transaction and for writing out changes to the database
 * in the correct order.
 *
 * @since       2.0
 * @author      Benjamin Eberlei <kontakt@beberlei.de>
 * @author      Guilherme Blanco <guilhermeblanco@hotmail.com>
 * @author      Jonathan Wage <jonwage@gmail.com>
 * @author      Roman Borschel <roman@code-factory.org>
 * @internal    This class contains highly performance-sensitive code.
 */
class UnitOfWork implements PropertyChangedListener
{
    
/**
     * An entity is in MANAGED state when its persistence is managed by an EntityManager.
     */
    
const STATE_MANAGED 1;

    
/**
     * An entity is new if it has just been instantiated (i.e. using the "new" operator)
     * and is not (yet) managed by an EntityManager.
     */
    
const STATE_NEW 2;

    
/**
     * A detached entity is an instance with persistent state and identity that is not
     * (or no longer) associated with an EntityManager (and a UnitOfWork).
     */
    
const STATE_DETACHED 3;

    
/**
     * A removed entity instance is an instance with a persistent identity,
     * associated with an EntityManager, whose persistent state will be deleted
     * on commit.
     */
    
const STATE_REMOVED 4;

    
/**
     * Hint used to collect all primary keys of associated entities during hydration
     * and execute it in a dedicated query afterwards
     * @see https://doctrine-orm.readthedocs.org/en/latest/reference/dql-doctrine-query-language.html?highlight=eager#temporarily-change-fetch-mode-in-dql
     */
    
const HINT_DEFEREAGERLOAD 'deferEagerLoad';

    
/**
     * The identity map that holds references to all managed entities that have
     * an identity. The entities are grouped by their class name.
     * Since all classes in a hierarchy must share the same identifier set,
     * we always take the root class name of the hierarchy.
     *
     * @var array
     */
    
private $identityMap = array();

    
/**
     * Map of all identifiers of managed entities.
     * Keys are object ids (spl_object_hash).
     *
     * @var array
     */
    
private $entityIdentifiers = array();

    
/**
     * Map of the original entity data of managed entities.
     * Keys are object ids (spl_object_hash). This is used for calculating changesets
     * at commit time.
     *
     * @var array
     * @internal Note that PHPs "copy-on-write" behavior helps a lot with memory usage.
     *           A value will only really be copied if the value in the entity is modified
     *           by the user.
     */
    
private $originalEntityData = array();

    
/**
     * Map of entity changes. Keys are object ids (spl_object_hash).
     * Filled at the beginning of a commit of the UnitOfWork and cleaned at the end.
     *
     * @var array
     */
    
private $entityChangeSets = array();

    
/**
     * The (cached) states of any known entities.
     * Keys are object ids (spl_object_hash).
     *
     * @var array
     */
    
private $entityStates = array();

    
/**
     * Map of entities that are scheduled for dirty checking at commit time.
     * This is only used for entities with a change tracking policy of DEFERRED_EXPLICIT.
     * Keys are object ids (spl_object_hash).
     *
     * @var array
     * @todo rename: scheduledForSynchronization
     */
    
private $scheduledForDirtyCheck = array();

    
/**
     * A list of all pending entity insertions.
     *
     * @var array
     */
    
private $entityInsertions = array();

    
/**
     * A list of all pending entity updates.
     *
     * @var array
     */
    
private $entityUpdates = array();

    
/**
     * Any pending extra updates that have been scheduled by persisters.
     *
     * @var array
     */
    
private $extraUpdates = array();

    
/**
     * A list of all pending entity deletions.
     *
     * @var array
     */
    
private $entityDeletions = array();

    
/**
     * All pending collection deletions.
     *
     * @var array
     */
    
private $collectionDeletions = array();

    
/**
     * All pending collection updates.
     *
     * @var array
     */
    
private $collectionUpdates = array();

    
/**
     * List of collections visited during changeset calculation on a commit-phase of a UnitOfWork.
     * At the end of the UnitOfWork all these collections will make new snapshots
     * of their data.
     *
     * @var array
     */
    
private $visitedCollections = array();

    
/**
     * The EntityManager that "owns" this UnitOfWork instance.
     *
     * @var DoctrineORMEntityManager
     */
    
private $em;

    
/**
     * The calculator used to calculate the order in which changes to
     * entities need to be written to the database.
     *
     * @var DoctrineORMInternalCommitOrderCalculator
     */
    
private $commitOrderCalculator;

    
/**
     * The entity persister instances used to persist entity instances.
     *
     * @var array
     */
    
private $persisters = array();

    
/**
     * The collection persister instances used to persist collections.
     *
     * @var array
     */
    
private $collectionPersisters = array();

    
/**
     * The EventManager used for dispatching events.
     *
     * @var DoctrineCommonEventManager
     */
    
private $evm;

    
/**
     * The ListenersInvoker used for dispatching events.
     *
     * @var DoctrineORMEventListenersInvoker
     */
    
private $listenersInvoker;

    
/**
     * Orphaned entities that are scheduled for removal.
     *
     * @var array
     */
    
private $orphanRemovals = array();

    
/**
     * Read-Only objects are never evaluated
     *
     * @var array
     */
    
private $readOnlyObjects = array();

    
/**
     * Map of Entity Class-Names and corresponding IDs that should eager loaded when requested.
     *
     * @var array
     */
    
private $eagerLoadingEntities = array();

    
/**
     * Initializes a new UnitOfWork instance, bound to the given EntityManager.
     *
     * @param DoctrineORMEntityManager $em
     */
    
public function __construct(EntityManager $em)
    {
        
$this->em               $em;
        
$this->evm              $em->getEventManager();
        
$this->listenersInvoker = new ListenersInvoker($em);
    }

    
/**
     * Commits the UnitOfWork, executing all operations that have been postponed
     * up to this point. The state of all managed entities will be synchronized with
     * the database.
     *
     * The operations are executed in the following order:
     *
     * 1) All entity insertions
     * 2) All entity updates
     * 3) All collection deletions
     * 4) All collection updates
     * 5) All entity deletions
     *
     * @param null|object|array $entity
     *
     * @return void
     *
     * @throws Exception
     */
    
public function commit($entity null)
    {
        
// Raise preFlush
        
if ($this->evm->hasListeners(Events::preFlush)) {
            
$this->evm->dispatchEvent(Events::preFlush, new PreFlushEventArgs($this->em));
        }

        
// Compute changes done since last commit.
        
if ($entity === null) {
            
$this->computeChangeSets();
        } elseif (
is_object($entity)) {
            
$this->computeSingleEntityChangeSet($entity);
        } elseif (
is_array($entity)) {
            foreach (
$entity as $object) {
                
$this->computeSingleEntityChangeSet($object);
            }
        }

        if ( ! (
$this->entityInsertions ||
                
$this->entityDeletions ||
                
$this->entityUpdates ||
                
$this->collectionUpdates ||
                
$this->collectionDeletions ||
                
$this->orphanRemovals)) {
            
$this->dispatchOnFlushEvent();
            
$this->dispatchPostFlushEvent();

            return; 
// Nothing to do.
        
}

        if (
$this->orphanRemovals) {
            foreach (
$this->orphanRemovals as $orphan) {
                
$this->remove($orphan);
            }
        }

        
$this->dispatchOnFlushEvent();

        
// Now we need a commit order to maintain referential integrity
        
$commitOrder $this->getCommitOrder();

        
$conn $this->em->getConnection();
        
$conn->beginTransaction();

        try {
            if (
$this->entityInsertions) {
                foreach (
$commitOrder as $class) {
                    
$this->executeInserts($class);
                }
            }

            if (
$this->entityUpdates) {
                foreach (
$commitOrder as $class) {
                    
$this->executeUpdates($class);
                }
            }

            
// Extra updates that were requested by persisters.
            
if ($this->extraUpdates) {
                
$this->executeExtraUpdates();
            }

            
// Collection deletions (deletions of complete collections)
            
foreach ($this->collectionDeletions as $collectionToDelete) {
                
$this->getCollectionPersister($collectionToDelete->getMapping())->delete($collectionToDelete);
            }
            
// Collection updates (deleteRows, updateRows, insertRows)
            
foreach ($this->collectionUpdates as $collectionToUpdate) {
                
$this->getCollectionPersister($collectionToUpdate->getMapping())->update($collectionToUpdate);
            }

            
// Entity deletions come last and need to be in reverse commit order
            
if ($this->entityDeletions) {
                for (
$count count($commitOrder), $i $count 1$i >= 0; --$i) {
                    
$this->executeDeletions($commitOrder[$i]);
                }
            }

            
$conn->commit();
        } catch (
Exception $e) {
            
$this->em->close();
            
$conn->rollback();

            throw 
$e;
        }

        
// Take new snapshots from visited collections
        
foreach ($this->visitedCollections as $coll) {
            
$coll->takeSnapshot();
        }

        
$this->dispatchPostFlushEvent();

        
// Clear up
        
$this->entityInsertions =
        
$this->entityUpdates =
        
$this->entityDeletions =
        
$this->extraUpdates =
        
$this->entityChangeSets =
        
$this->collectionUpdates =
        
$this->collectionDeletions =
        
$this->visitedCollections =
        
$this->scheduledForDirtyCheck =
        
$this->orphanRemovals = array();
    }

    
/**
     * Computes the changesets of all entities scheduled for insertion.
     *
     * @return void
     */
    
private function computeScheduleInsertsChangeSets()
    {
        foreach (
$this->entityInsertions as $entity) {
            
$class $this->em->getClassMetadata(get_class($entity));

            
$this->computeChangeSet($class$entity);
        }
    }

    
/**
     * Only flushes the given entity according to a ruleset that keeps the UoW consistent.
     *
     * 1. All entities scheduled for insertion, (orphan) removals and changes in collections are processed as well!
     * 2. Read Only entities are skipped.
     * 3. Proxies are skipped.
     * 4. Only if entity is properly managed.
     *
     * @param object $entity
     *
     * @return void
     *
     * @throws InvalidArgumentException
     */
    
private function computeSingleEntityChangeSet($entity)
    {
        
$state $this->getEntityState($entity);

        if (
$state !== self::STATE_MANAGED && $state !== self::STATE_REMOVED) {
            throw new 
InvalidArgumentException("Entity has to be managed or scheduled for removal for single computation " self::objToStr($entity));
        }

        
$class $this->em->getClassMetadata(get_class($entity));

        if (
$state === self::STATE_MANAGED && $class->isChangeTrackingDeferredImplicit()) {
            
$this->persist($entity);
        }

        
// Compute changes for INSERTed entities first. This must always happen even in this case.
        
$this->computeScheduleInsertsChangeSets();

        if (
$class->isReadOnly) {
            return;
        }

        
// Ignore uninitialized proxy objects
        
if ($entity instanceof Proxy && ! $entity->__isInitialized__) {
            return;
        }

        
// Only MANAGED entities that are NOT SCHEDULED FOR INSERTION are processed here.
        
$oid spl_object_hash($entity);

        if ( ! isset(
$this->entityInsertions[$oid]) && isset($this->entityStates[$oid])) {
            
$this->computeChangeSet($class$entity);
        }
    }

    
/**
     * Executes any extra updates that have been scheduled.
     */
    
private function executeExtraUpdates()
    {
        foreach (
$this->extraUpdates as $oid => $update) {
            list (
$entity$changeset) = $update;

            
$this->entityChangeSets[$oid] = $changeset;
            
$this->getEntityPersister(get_class($entity))->update($entity);
        }
    }

    
/**
     * Gets the changeset for an entity.
     *
     * @param object $entity
     *
     * @return array
     */
    
public function getEntityChangeSet($entity)
    {
        
$oid spl_object_hash($entity);

        if (isset(
$this->entityChangeSets[$oid])) {
            return 
$this->entityChangeSets[$oid];
        }

        return array();
    }

    
/**
     * Computes the changes that happened to a single entity.
     *
     * Modifies/populates the following properties:
     *
     * {@link _originalEntityData}
     * If the entity is NEW or MANAGED but not yet fully persisted (only has an id)
     * then it was not fetched from the database and therefore we have no original
     * entity data yet. All of the current entity data is stored as the original entity data.
     *
     * {@link _entityChangeSets}
     * The changes detected on all properties of the entity are stored there.
     * A change is a tuple array where the first entry is the old value and the second
     * entry is the new value of the property. Changesets are used by persisters
     * to INSERT/UPDATE the persistent entity state.
     *
     * {@link _entityUpdates}
     * If the entity is already fully MANAGED (has been fetched from the database before)
     * and any changes to its properties are detected, then a reference to the entity is stored
     * there to mark it for an update.
     *
     * {@link _collectionDeletions}
     * If a PersistentCollection has been de-referenced in a fully MANAGED entity,
     * then this collection is marked for deletion.
     *
     * @ignore
     *
     * @internal Don't call from the outside.
     *
     * @param ClassMetadata $class The class descriptor of the entity.
     * @param object $entity The entity for which to compute the changes.
     *
     * @return void
     */
    
public function computeChangeSet(ClassMetadata $class$entity)
    {
        
$oid spl_object_hash($entity);

        if (isset(
$this->readOnlyObjects[$oid])) {
            return;
        }

        if ( ! 
$class->isInheritanceTypeNone()) {
            
$class $this->em->getClassMetadata(get_class($entity));
        }

        
$invoke $this->listenersInvoker->getSubscribedSystems($classEvents::preFlush) & ~ListenersInvoker::INVOKE_MANAGER;

        if (
$invoke !== ListenersInvoker::INVOKE_NONE) {
            
$this->listenersInvoker->invoke($classEvents::preFlush$entity, new PreFlushEventArgs($this->em), $invoke);
        }

        
$actualData = array();

        foreach (
$class->reflFields as $name => $refProp) {
            
$value $refProp->getValue($entity);

            if (
$class->isCollectionValuedAssociation($name) && $value !== null) {
                if (
$value instanceof PersistentCollection) {
                    if (
$value->getOwner() === $entity) {
                        continue;
                    }

                    
$value = new ArrayCollection($value->getValues());
                }

                
// If $value is not a Collection then use an ArrayCollection.
                
if ( ! $value instanceof Collection) {
                    
$value = new ArrayCollection($value);
                }

                
$assoc $class->associationMappings[$name];

                
// Inject PersistentCollection
                
$value = new PersistentCollection(
                    
$this->em$this->em->getClassMetadata($assoc['targetEntity']), $value
                
);
                
$value->setOwner($entity$assoc);
                
$value->setDirty( ! $value->isEmpty());

                
$class->reflFields[$name]->setValue($entity$value);

                
$actualData[$name] = $value;

                continue;
            }

            if (( ! 
$class->isIdentifier($name) || ! $class->isIdGeneratorIdentity()) && ($name !== $class->versionField)) {
                
$actualData[$name] = $value;
            }
        }

        if ( ! isset(
$this->originalEntityData[$oid])) {
            
// Entity is either NEW or MANAGED but not yet fully persisted (only has an id).
            // These result in an INSERT.
            
$this->originalEntityData[$oid] = $actualData;
            
$changeSet = array();

            foreach (
$actualData as $propName => $actualValue) {
                if ( ! isset(
$class->associationMappings[$propName])) {
                    
$changeSet[$propName] = array(null$actualValue);

                    continue;
                }

                
$assoc $class->associationMappings[$propName];

                if (
$assoc['isOwningSide'] && $assoc['type'] & ClassMetadata::TO_ONE) {
                    
$changeSet[$propName] = array(null$actualValue);
                }
            }

            
$this->entityChangeSets[$oid] = $changeSet;
        } else {
            
// Entity is "fully" MANAGED: it was already fully persisted before
            // and we have a copy of the original data
            
$originalData           $this->originalEntityData[$oid];
            
$isChangeTrackingNotify $class->isChangeTrackingNotify();
            
$changeSet              = ($isChangeTrackingNotify && isset($this->entityChangeSets[$oid]))
                ? 
$this->entityChangeSets[$oid]
                : array();

            foreach (
$actualData as $propName => $actualValue) {
                
// skip field, its a partially omitted one!
                
if ( ! (isset($originalData[$propName]) || array_key_exists($propName$originalData))) {
                    continue;
                }

                
$orgValue $originalData[$propName];

                
// skip if value haven't changed
                
if ($orgValue === $actualValue) {
                    continue;
                }

                
// if regular field
                
if ( ! isset($class->associationMappings[$propName])) {
                    if (
$isChangeTrackingNotify) {
                        continue;
                    }

                    
$changeSet[$propName] = array($orgValue$actualValue);

                    continue;
                }

                
$assoc $class->associationMappings[$propName];

                
// Persistent collection was exchanged with the "originally"
                // created one. This can only mean it was cloned and replaced
                // on another entity.
                
if ($actualValue instanceof PersistentCollection) {
                    
$owner $actualValue->getOwner();
                    if (
$owner === null) { // cloned
                        
$actualValue->setOwner($entity$assoc);
                    } else if (
$owner !== $entity) { // no clone, we have to fix
                        
if (!$actualValue->isInitialized()) {
                            
$actualValue->initialize(); // we have to do this otherwise the cols share state
                        
}
                        
$newValue = clone $actualValue;
                        
$newValue->setOwner($entity$assoc);
                        
$class->reflFields[$propName]->setValue($entity$newValue);
                    }
                }

                if (
$orgValue instanceof PersistentCollection) {
                    
// A PersistentCollection was de-referenced, so delete it.
                    
$coid spl_object_hash($orgValue);

                    if (isset(
$this->collectionDeletions[$coid])) {
                        continue;
                    }

                    
$this->collectionDeletions[$coid] = $orgValue;
                    
$changeSet[$propName] = $orgValue// Signal changeset, to-many assocs will be ignored.

                    
continue;
                }

                if (
$assoc['type'] & ClassMetadata::TO_ONE) {
                    if (
$assoc['isOwningSide']) {
                        
$changeSet[$propName] = array($orgValue$actualValue);
                    }

                    if (
$orgValue !== null && $assoc['orphanRemoval']) {
                        
$this->scheduleOrphanRemoval($orgValue);
                    }
                }
            }

            if (
$changeSet) {
                
$this->entityChangeSets[$oid]   = $changeSet;
                
$this->originalEntityData[$oid] = $actualData;
                
$this->entityUpdates[$oid]      = $entity;
            }
        }

        
// Look for changes in associations of the entity
        
foreach ($class->associationMappings as $field => $assoc) {
            if ((
$val $class->reflFields[$field]->getValue($entity)) !== null) {
                
$this->computeAssociationChanges($assoc$val);
                if (!isset(
$this->entityChangeSets[$oid]) &&
                    
$assoc['isOwningSide'] &&
                    
$assoc['type'] == ClassMetadata::MANY_TO_MANY &&
                    
$val instanceof PersistentCollection &&
                    
$val->isDirty()) {
                    
$this->entityChangeSets[$oid]   = array();
                    
$this->originalEntityData[$oid] = $actualData;
                    
$this->entityUpdates[$oid]      = $entity;
                }
            }
        }
    }

    
/**
     * Computes all the changes that have been done to entities and collections
     * since the last commit and stores these changes in the _entityChangeSet map
     * temporarily for access by the persisters, until the UoW commit is finished.
     *
     * @return void
     */
    
public function computeChangeSets()
    {
        
// Compute changes for INSERTed entities first. This must always happen.
        
$this->computeScheduleInsertsChangeSets();

        
// Compute changes for other MANAGED entities. Change tracking policies take effect here.
        
foreach ($this->identityMap as $className => $entities) {
            
$class $this->em->getClassMetadata($className);

            
// Skip class if instances are read-only
            
if ($class->isReadOnly) {
                continue;
            }

            
// If change tracking is explicit or happens through notification, then only compute
            // changes on entities of that type that are explicitly marked for synchronization.
            
switch (true) {
                case (
$class->isChangeTrackingDeferredImplicit()):
                    
$entitiesToProcess $entities;
                    break;

                case (isset(
$this->scheduledForDirtyCheck[$className])):
                    
$entitiesToProcess $this->scheduledForDirtyCheck[$className];
                    break;

                default:
                    
$entitiesToProcess = array();

            }

            foreach (
$entitiesToProcess as $entity) {
                
// Ignore uninitialized proxy objects
                
if ($entity instanceof Proxy && ! $entity->__isInitialized__) {
                    continue;
                }

                
// Only MANAGED entities that are NOT SCHEDULED FOR INSERTION are processed here.
                
$oid spl_object_hash($entity);

                if ( ! isset(
$this->entityInsertions[$oid]) && isset($this->entityStates[$oid])) {
                    
$this->computeChangeSet($class$entity);
                }
            }
        }
    }

    
/**
     * Computes the changes of an association.
     *
     * @param array $assoc
     * @param mixed $value The value of the association.
     *
     * @throws ORMInvalidArgumentException
     * @throws ORMException
     *
     * @return void
     */
    
private function computeAssociationChanges($assoc$value)
    {
        if (
$value instanceof Proxy && ! $value->__isInitialized__) {
            return;
        }

        if (
$value instanceof PersistentCollection && $value->isDirty()) {
            
$coid spl_object_hash($value);

            if (
$assoc['isOwningSide']) {
                
$this->collectionUpdates[$coid] = $value;
            }

            
$this->visitedCollections[$coid] = $value;
        }

        
// Look through the entities, and in any of their associations,
        // for transient (new) entities, recursively. ("Persistence by reachability")
        // Unwrap. Uninitialized collections will simply be empty.
        
$unwrappedValue = ($assoc['type'] & ClassMetadata::TO_ONE) ? array($value) : $value->unwrap();
        
$targetClass    $this->em->getClassMetadata($assoc['targetEntity']);

        foreach (
$unwrappedValue as $key => $entry) {
            
$state $this->getEntityState($entryself::STATE_NEW);

            if ( ! (
$entry instanceof $assoc['targetEntity'])) {
                throw new 
ORMException(
                    
sprintf(
                        
'Found entity of type %s on association %s#%s, but expecting %s',
                        
get_class($entry),
                        
$assoc['sourceEntity'],
                        
$assoc['fieldName'],
                        
$targetClass->name
                    
)
                );
            }

            switch (
$state) {
                case 
self::STATE_NEW:
                    if ( ! 
$assoc['isCascadePersist']) {
                        throw 
ORMInvalidArgumentException::newEntityFoundThroughRelationship($assoc$entry);
                    }

                    
$this->persistNew($targetClass$entry);
                    
$this->computeChangeSet($targetClass$entry);
                    break;

                case 
self::STATE_REMOVED:
                    
// Consume the $value as array (it's either an array or an ArrayAccess)
                    // and remove the element from Collection.
                    
if ($assoc['type'] & ClassMetadata::TO_MANY) {
                        unset(
$value[$key]);
                    }
                    break;

                case 
self::STATE_DETACHED:
                    
// Can actually not happen right now as we assume STATE_NEW,
                    // so the exception will be raised from the DBAL layer (constraint violation).
                    
throw ORMInvalidArgumentException::detachedEntityFoundThroughRelationship($assoc$entry);
                    break;

                default:
                    
// MANAGED associated entities are already taken into account
                    // during changeset calculation anyway, since they are in the identity map.
            
}
        }
    }

    
/**
     * @param DoctrineORMMappingClassMetadata $class
     * @param object        $entity
     *
     * @return void
     */
    
private function persistNew($class$entity)
    {
        
$oid    spl_object_hash($entity);
        
$invoke $this->listenersInvoker->getSubscribedSystems($classEvents::prePersist);

        if (
$invoke !== ListenersInvoker::INVOKE_NONE) {
            
$this->listenersInvoker->invoke($classEvents::prePersist$entity, new LifecycleEventArgs($entity$this->em), $invoke);
        }

        
$idGen $class->idGenerator;

        if ( ! 
$idGen->isPostInsertGenerator()) {
            
$idValue $idGen->generate($this->em$entity);

            if ( ! 
$idGen instanceof DoctrineORMIdAssignedGenerator) {
                
$idValue = array($class->identifier[0] => $idValue);

                
$class->setIdentifierValues($entity$idValue);
            }

            
$this->entityIdentifiers[$oid] = $idValue;
        }

        
$this->entityStates[$oid] = self::STATE_MANAGED;

        
$this->scheduleForInsert($entity);
    }

    
/**
     * INTERNAL:
     * Computes the changeset of an individual entity, independently of the
     * computeChangeSets() routine that is used at the beginning of a UnitOfWork#commit().
     *
     * The passed entity must be a managed entity. If the entity already has a change set
     * because this method is invoked during a commit cycle then the change sets are added.
     * whereby changes detected in this method prevail.
     *
     * @ignore
     *
     * @param ClassMetadata $class  The class descriptor of the entity.
     * @param object        $entity The entity for which to (re)calculate the change set.
     *
     * @return void
     *
     * @throws ORMInvalidArgumentException If the passed entity is not MANAGED.
     */
    
public function recomputeSingleEntityChangeSet(ClassMetadata $class$entity)
    {
        
$oid spl_object_hash($entity);

        if ( ! isset(
$this->entityStates[$oid]) || $this->entityStates[$oid] != self::STATE_MANAGED) {
            throw 
ORMInvalidArgumentException::entityNotManaged($entity);
        }

        
// skip if change tracking is "NOTIFY"
        
if ($class->isChangeTrackingNotify()) {
            return;
        }

        if ( ! 
$class->isInheritanceTypeNone()) {
            
$class $this->em->getClassMetadata(get_class($entity));
        }

        
$actualData = array();

        foreach (
$class->reflFields as $name => $refProp) {
            if (( ! 
$class->isIdentifier($name) || ! $class->isIdGeneratorIdentity())
                && (
$name !== $class->versionField)
                && ! 
$class->isCollectionValuedAssociation($name)) {
                
$actualData[$name] = $refProp->getValue($entity);
            }
        }

        if ( ! isset(
$this->originalEntityData[$oid])) {
            throw new 
RuntimeException('Cannot call recomputeSingleEntityChangeSet before computeChangeSet on an entity.');
        }

        
$originalData $this->originalEntityData[$oid];
        
$changeSet = array();

        foreach (
$actualData as $propName => $actualValue) {
            
$orgValue = isset($originalData[$propName]) ? $originalData[$propName] : null;

            if (
$orgValue !== $actualValue) {
                
$changeSet[$propName] = array($orgValue$actualValue);
            }
        }

        if (
$changeSet) {
            if (isset(
$this->entityChangeSets[$oid])) {
                
$this->entityChangeSets[$oid] = array_merge($this->entityChangeSets[$oid], $changeSet);
            } else if ( ! isset(
$this->entityInsertions[$oid])) {
                
$this->entityChangeSets[$oid] = $changeSet;
                
$this->entityUpdates[$oid]    = $entity;
            }
            
$this->originalEntityData[$oid] = $actualData;
        }
    }

    
/**
     * Executes all entity insertions for entities of the specified type.
     *
     * @param DoctrineORMMappingClassMetadata $class
     *
     * @return void
     */
    
private function executeInserts($class)
    {
        
$entities   = array();
        
$className  $class->name;
        
$persister  $this->getEntityPersister($className);
        
$invoke     $this->listenersInvoker->getSubscribedSystems($classEvents::postPersist);

        foreach (
$this->entityInsertions as $oid => $entity) {
            if (
$this->em->getClassMetadata(get_class($entity))->name !== $className) {
                continue;
            }

            
$persister->addInsert($entity);

            unset(
$this->entityInsertions[$oid]);

            if (
$invoke !== ListenersInvoker::INVOKE_NONE) {
                
$entities[] = $entity;
            }
        }

        
$postInsertIds $persister->executeInserts();

        if (
$postInsertIds) {
            
// Persister returned post-insert IDs
            
foreach ($postInsertIds as $id => $entity) {
                
$oid     spl_object_hash($entity);
                
$idField $class->identifier[0];

                
$class->reflFields[$idField]->setValue($entity$id);

                
$this->entityIdentifiers[$oid] = array($idField => $id);
                
$this->entityStates[$oid] = self::STATE_MANAGED;
                
$this->originalEntityData[$oid][$idField] = $id;

                
$this->addToIdentityMap($entity);
            }
        }

        foreach (
$entities as $entity) {
            
$this->listenersInvoker->invoke($classEvents::postPersist$entity, new LifecycleEventArgs($entity$this->em), $invoke);
        }
    }

    
/**
     * Executes all entity updates for entities of the specified type.
     *
     * @param DoctrineORMMappingClassMetadata $class
     *
     * @return void
     */
    
private function executeUpdates($class)
    {
        
$className          $class->name;
        
$persister          $this->getEntityPersister($className);
        
$preUpdateInvoke    $this->listenersInvoker->getSubscribedSystems($classEvents::preUpdate);
        
$postUpdateInvoke   $this->listenersInvoker->getSubscribedSystems($classEvents::postUpdate);

        foreach (
$this->entityUpdates as $oid => $entity) {
            if (
$this->em->getClassMetadata(get_class($entity))->name !== $className) {
                continue;
            }

            if (
$preUpdateInvoke != ListenersInvoker::INVOKE_NONE) {
                
$this->listenersInvoker->invoke($classEvents::preUpdate$entity, new PreUpdateEventArgs($entity$this->em$this->entityChangeSets[$oid]), $preUpdateInvoke);
                
$this->recomputeSingleEntityChangeSet($class$entity);
            }

            if ( ! empty(
$this->entityChangeSets[$oid])) {
                
$persister->update($entity);
            }

            unset(
$this->entityUpdates[$oid]);

            if (
$postUpdateInvoke != ListenersInvoker::INVOKE_NONE) {
                
$this->listenersInvoker->invoke($classEvents::postUpdate$entity, new LifecycleEventArgs($entity$this->em), $postUpdateInvoke);
            }
        }
    }

    
/**
     * Executes all entity deletions for entities of the specified type.
     *
     * @param DoctrineORMMappingClassMetadata $class
     *
     * @return void
     */
    
private function executeDeletions($class)
    {
        
$className  $class->name;
        
$persister  $this->getEntityPersister($className);
        
$invoke     $this->listenersInvoker->getSubscribedSystems($classEvents::postRemove);

        foreach (
$this->entityDeletions as $oid => $entity) {
            if (
$this->em->getClassMetadata(get_class($entity))->name !== $className) {
                continue;
            }

            
$persister->delete($entity);

            unset(
                
$this->entityDeletions[$oid],
                
$this->entityIdentifiers[$oid],
                
$this->originalEntityData[$oid],
                
$this->entityStates[$oid]
            );

            
// Entity with this $oid after deletion treated as NEW, even if the $oid
            // is obtained by a new entity because the old one went out of scope.
            //$this->entityStates[$oid] = self::STATE_NEW;
            
if ( ! $class->isIdentifierNatural()) {
                
$class->reflFields[$class->identifier[0]]->setValue($entitynull);
            }

            if (
$invoke !== ListenersInvoker::INVOKE_NONE) {
                
$this->listenersInvoker->invoke($classEvents::postRemove$entity, new LifecycleEventArgs($entity$this->em), $invoke);
            }
        }
    }

    
/**
     * Gets the commit order.
     *
     * @param array|null $entityChangeSet
     *
     * @return array
     */
    
private function getCommitOrder(array $entityChangeSet null)
    {
        if (
$entityChangeSet === null) {
            
$entityChangeSet array_merge($this->entityInsertions$this->entityUpdates$this->entityDeletions);
        }

        
$calc $this->getCommitOrderCalculator();

        
// See if there are any new classes in the changeset, that are not in the
        // commit order graph yet (don't have a node).
        // We have to inspect changeSet to be able to correctly build dependencies.
        // It is not possible to use IdentityMap here because post inserted ids
        // are not yet available.
        
$newNodes = array();

        foreach (
$entityChangeSet as $entity) {
            
$className $this->em->getClassMetadata(get_class($entity))->name;

            if (
$calc->hasClass($className)) {
                continue;
            }

            
$class $this->em->getClassMetadata($className);
            
$calc->addClass($class);

            
$newNodes[] = $class;
        }

        
// Calculate dependencies for new nodes
        
while ($class array_pop($newNodes)) {
            foreach (
$class->associationMappings as $assoc) {
                if ( ! (
$assoc['isOwningSide'] && $assoc['type'] & ClassMetadata::TO_ONE)) {
                    continue;
                }

                
$targetClass $this->em->getClassMetadata($assoc['targetEntity']);

                if ( ! 
$calc->hasClass($targetClass->name)) {
                    
$calc->addClass($targetClass);

                    
$newNodes[] = $targetClass;
                }

                
$calc->addDependency($targetClass$class);

                
// If the target class has mapped subclasses, these share the same dependency.
                
if ( ! $targetClass->subClasses) {
                    continue;
                }

                foreach (
$targetClass->subClasses as $subClassName) {
                    
$targetSubClass $this->em->getClassMetadata($subClassName);

                    if ( ! 
$calc->hasClass($subClassName)) {
                        
$calc->addClass($targetSubClass);

                        
$newNodes[] = $targetSubClass;
                    }

                    
$calc->addDependency($targetSubClass$class);
                }
            }
        }

        return 
$calc->getCommitOrder();
    }

    
/**
     * Schedules an entity for insertion into the database.
     * If the entity already has an identifier, it will be added to the identity map.
     *
     * @param object $entity The entity to schedule for insertion.
     *
     * @return void
     *
     * @throws ORMInvalidArgumentException
     * @throws InvalidArgumentException
     */
    
public function scheduleForInsert($entity)
    {
        
$oid spl_object_hash($entity);

        if (isset(
$this->entityUpdates[$oid])) {
            throw new 
InvalidArgumentException("Dirty entity can not be scheduled for insertion.");
        }

        if (isset(
$this->entityDeletions[$oid])) {
            throw 
ORMInvalidArgumentException::scheduleInsertForRemovedEntity($entity);
        }
        if (isset(
$this->originalEntityData[$oid]) && ! isset($this->entityInsertions[$oid])) {
            throw 
ORMInvalidArgumentException::scheduleInsertForManagedEntity($entity);
        }

        if (isset(
$this->entityInsertions[$oid])) {
            throw 
ORMInvalidArgumentException::scheduleInsertTwice($entity);
        }

        
$this->entityInsertions[$oid] = $entity;

        if (isset(
$this->entityIdentifiers[$oid])) {
            
$this->addToIdentityMap($entity);
        }

        if (
$entity instanceof NotifyPropertyChanged) {
            
$entity->addPropertyChangedListener($this);
        }
    }

    
/**
     * Checks whether an entity is scheduled for insertion.
     *
     * @param object $entity
     *
     * @return boolean
     */
    
public function isScheduledForInsert($entity)
    {
        return isset(
$this->entityInsertions[spl_object_hash($entity)]);
    }

    
/**
     * Schedules an entity for being updated.
     *
     * @param object $entity The entity to schedule for being updated.
     *
     * @return void
     *
     * @throws ORMInvalidArgumentException
     */
    
public function scheduleForUpdate($entity)
    {
        
$oid spl_object_hash($entity);

        if ( ! isset(
$this->entityIdentifiers[$oid])) {
            throw 
ORMInvalidArgumentException::entityHasNoIdentity($entity"scheduling for update");
        }

        if (isset(
$this->entityDeletions[$oid])) {
            throw 
ORMInvalidArgumentException::entityIsRemoved($entity"schedule for update");
        }

        if ( ! isset(
$this->entityUpdates[$oid]) && ! isset($this->entityInsertions[$oid])) {
            
$this->entityUpdates[$oid] = $entity;
        }
    }

    
/**
     * INTERNAL:
     * Schedules an extra update that will be executed immediately after the
     * regular entity updates within the currently running commit cycle.
     *
     * Extra updates for entities are stored as (entity, changeset) tuples.
     *
     * @ignore
     *
     * @param object $entity    The entity for which to schedule an extra update.
     * @param array  $changeset The changeset of the entity (what to update).
     *
     * @return void
     */
    
public function scheduleExtraUpdate($entity, array $changeset)
    {
        
$oid         spl_object_hash($entity);
        
$extraUpdate = array($entity$changeset);

        if (isset(
$this->extraUpdates[$oid])) {
            list(
$ignored$changeset2) = $this->extraUpdates[$oid];

            
$extraUpdate = array($entity$changeset $changeset2);
        }

        
$this->extraUpdates[$oid] = $extraUpdate;
    }

    
/**
     * Checks whether an entity is registered as dirty in the unit of work.
     * Note: Is not very useful currently as dirty entities are only registered
     * at commit time.
     *
     * @param object $entity
     *
     * @return boolean
     */
    
public function isScheduledForUpdate($entity)
    {
        return isset(
$this->entityUpdates[spl_object_hash($entity)]);
    }

    
/**
     * Checks whether an entity is registered to be checked in the unit of work.
     *
     * @param object $entity
     *
     * @return boolean
     */
    
public function isScheduledForDirtyCheck($entity)
    {
        
$rootEntityName $this->em->getClassMetadata(get_class($entity))->rootEntityName;

        return isset(
$this->scheduledForDirtyCheck[$rootEntityName][spl_object_hash($entity)]);
    }

    
/**
     * INTERNAL:
     * Schedules an entity for deletion.
     *
     * @param object $entity
     *
     * @return void
     */
    
public function scheduleForDelete($entity)
    {
        
$oid spl_object_hash($entity);

        if (isset(
$this->entityInsertions[$oid])) {
            if (
$this->isInIdentityMap($entity)) {
                
$this->removeFromIdentityMap($entity);
            }

            unset(
$this->entityInsertions[$oid], $this->entityStates[$oid]);

            return; 
// entity has not been persisted yet, so nothing more to do.
        
}

        if ( ! 
$this->isInIdentityMap($entity)) {
            return;
        }

        
$this->removeFromIdentityMap($entity);

        if (isset(
$this->entityUpdates[$oid])) {
            unset(
$this->entityUpdates[$oid]);
        }

        if ( ! isset(
$this->entityDeletions[$oid])) {
            
$this->entityDeletions[$oid] = $entity;
            
$this->entityStates[$oid]    = self::STATE_REMOVED;
        }
    }

    
/**
     * Checks whether an entity is registered as removed/deleted with the unit
     * of work.
     *
     * @param object $entity
     *
     * @return boolean
     */
    
public function isScheduledForDelete($entity)
    {
        return isset(
$this->entityDeletions[spl_object_hash($entity)]);
    }

    
/**
     * Checks whether an entity is scheduled for insertion, update or deletion.
     *
     * @param object $entity
     *
     * @return boolean
     */
    
public function isEntityScheduled($entity)
    {
        
$oid spl_object_hash($entity);

        return isset(
$this->entityInsertions[$oid])
            || isset(
$this->entityUpdates[$oid])
            || isset(
$this->entityDeletions[$oid]);
    }

    
/**
     * INTERNAL:
     * Registers an entity in the identity map.
     * Note that entities in a hierarchy are registered with the class name of
     * the root entity.
     *
     * @ignore
     *
     * @param object $entity  The entity to register.
     *
     * @return boolean TRUE if the registration was successful, FALSE if the identity of
     *                 the entity in question is already managed.
     *
     * @throws ORMInvalidArgumentException
     */
    
public function addToIdentityMap($entity)
    {
        
$classMetadata $this->em->getClassMetadata(get_class($entity));
        
$idHash        implode(' '$this->entityIdentifiers[spl_object_hash($entity)]);

        if (
$idHash === '') {
            throw 
ORMInvalidArgumentException::entityWithoutIdentity($classMetadata->name$entity);
        }

        
$className $classMetadata->rootEntityName;

        if (isset(
$this->identityMap[$className][$idHash])) {
            return 
false;
        }

        
$this->identityMap[$className][$idHash] = $entity;

        return 
true;
    }

    
/**
     * Gets the state of an entity with regard to the current unit of work.
     *
     * @param object   $entity
     * @param int|null $assume The state to assume if the state is not yet known (not MANAGED or REMOVED).
     *                         This parameter can be set to improve performance of entity state detection
     *                         by potentially avoiding a database lookup if the distinction between NEW and DETACHED
     *                         is either known or does not matter for the caller of the method.
     *
     * @return int The entity state.
     */
    
public function getEntityState($entity$assume null)
    {
        
$oid spl_object_hash($entity);

        if (isset(
$this->entityStates[$oid])) {
            return 
$this->entityStates[$oid];
        }

        if (
$assume !== null) {
            return 
$assume;
        }

        
// State can only be NEW or DETACHED, because MANAGED/REMOVED states are known.
        // Note that you can not remember the NEW or DETACHED state in _entityStates since
        // the UoW does not hold references to such objects and the object hash can be reused.
        // More generally because the state may "change" between NEW/DETACHED without the UoW being aware of it.
        
$class $this->em->getClassMetadata(get_class($entity));
        
$id    $class->getIdentifierValues($entity);

        if ( ! 
$id) {
            return 
self::STATE_NEW;
        }

        if (
$class->containsForeignIdentifier) {
            
$id $this->flattenIdentifier($class$id);
        }

        switch (
true) {
            case (
$class->isIdentifierNatural());
                
// Check for a version field, if available, to avoid a db lookup.
                
if ($class->isVersioned) {
                    return (
$class->getFieldValue($entity$class->versionField))
                        ? 
self::STATE_DETACHED
                        
self::STATE_NEW;
                }

                
// Last try before db lookup: check the identity map.
                
if ($this->tryGetById($id$class->rootEntityName)) {
                    return 
self::STATE_DETACHED;
                }

                
// db lookup
                
if ($this->getEntityPersister($class->name)->exists($entity)) {
                    return 
self::STATE_DETACHED;
                }

                return 
self::STATE_NEW;

            case ( ! 
$class->idGenerator->isPostInsertGenerator()):
                
// if we have a pre insert generator we can't be sure that having an id
                // really means that the entity exists. We have to verify this through
                // the last resort: a db lookup

                // Last try before db lookup: check the identity map.
                
if ($this->tryGetById($id$class->rootEntityName)) {
                    return 
self::STATE_DETACHED;
                }

                
// db lookup
                
if ($this->getEntityPersister($class->name)->exists($entity)) {
                    return 
self::STATE_DETACHED;
                }

                return 
self::STATE_NEW;

            default:
                return 
self::STATE_DETACHED;
        }
    }

    
/**
     * INTERNAL:
     * Removes an entity from the identity map. This effectively detaches the
     * entity from the persistence management of Doctrine.
     *
     * @ignore
     *
     * @param object $entity
     *
     * @return boolean
     *
     * @throws ORMInvalidArgumentException
     */
    
public function removeFromIdentityMap($entity)
    {
        
$oid           spl_object_hash($entity);
        
$classMetadata $this->em->getClassMetadata(get_class($entity));
        
$idHash        implode(' '$this->entityIdentifiers[$oid]);

        if (
$idHash === '') {
            throw 
ORMInvalidArgumentException::entityHasNoIdentity($entity"remove from identity map");
        }

        
$className $classMetadata->rootEntityName;

        if (isset(
$this->identityMap[$className][$idHash])) {
            unset(
$this->identityMap[$className][$idHash]);
            unset(
$this->readOnlyObjects[$oid]);

            
//$this->entityStates[$oid] = self::STATE_DETACHED;

            
return true;
        }

        return 
false;
    }

    
/**
     * INTERNAL:
     * Gets an entity in the identity map by its identifier hash.
     *
     * @ignore
     *
     * @param string $idHash
     * @param string $rootClassName
     *
     * @return object
     */
    
public function getByIdHash($idHash$rootClassName)
    {
        return 
$this->identityMap[$rootClassName][$idHash];
    }

    
/**
     * INTERNAL:
     * Tries to get an entity by its identifier hash. If no entity is found for
     * the given hash, FALSE is returned.
     *
     * @ignore
     *
     * @param string $idHash
     * @param string $rootClassName
     *
     * @return object|bool The found entity or FALSE.
     */
    
public function tryGetByIdHash($idHash$rootClassName)
    {
        if (isset(
$this->identityMap[$rootClassName][$idHash])) {
            return 
$this->identityMap[$rootClassName][$idHash];
        }

        return 
false;
    }

    
/**
     * Checks whether an entity is registered in the identity map of this UnitOfWork.
     *
     * @param object $entity
     *
     * @return boolean
     */
    
public function isInIdentityMap($entity)
    {
        
$oid spl_object_hash($entity);

        if ( ! isset(
$this->entityIdentifiers[$oid])) {
            return 
false;
        }

        
$classMetadata $this->em->getClassMetadata(get_class($entity));
        
$idHash        implode(' '$this->entityIdentifiers[$oid]);

        if (
$idHash === '') {
            return 
false;
        }

        return isset(
$this->identityMap[$classMetadata->rootEntityName][$idHash]);
    }

    
/**
     * INTERNAL:
     * Checks whether an identifier hash exists in the identity map.
     *
     * @ignore
     *
     * @param string $idHash
     * @param string $rootClassName
     *
     * @return boolean
     */
    
public function containsIdHash($idHash$rootClassName)
    {
        return isset(
$this->identityMap[$rootClassName][$idHash]);
    }

    
/**
     * Persists an entity as part of the current unit of work.
     *
     * @param object $entity The entity to persist.
     *
     * @return void
     */
    
public function persist($entity)
    {
        
$visited = array();

        
$this->doPersist($entity$visited);
    }

    
/**
     * Persists an entity as part of the current unit of work.
     *
     * This method is internally called during persist() cascades as it tracks
     * the already visited entities to prevent infinite recursions.
     *
     * @param object $entity  The entity to persist.
     * @param array  $visited The already visited entities.
     *
     * @return void
     *
     * @throws ORMInvalidArgumentException
     * @throws UnexpectedValueException
     */
    
private function doPersist($entity, array &$visited)
    {
        
$oid spl_object_hash($entity);

        if (isset(
$visited[$oid])) {
            return; 
// Prevent infinite recursion
        
}

        
$visited[$oid] = $entity// Mark visited

        
$class $this->em->getClassMetadata(get_class($entity));

        
// We assume NEW, so DETACHED entities result in an exception on flush (constraint violation).
        // If we would detect DETACHED here we would throw an exception anyway with the same
        // consequences (not recoverable/programming error), so just assuming NEW here
        // lets us avoid some database lookups for entities with natural identifiers.
        
$entityState $this->getEntityState($entityself::STATE_NEW);

        switch (
$entityState) {
            case 
self::STATE_MANAGED:
                
// Nothing to do, except if policy is "deferred explicit"
                
if ($class->isChangeTrackingDeferredExplicit()) {
                    
$this->scheduleForDirtyCheck($entity);
                }
                break;

            case 
self::STATE_NEW:
                
$this->persistNew($class$entity);
                break;

            case 
self::STATE_REMOVED:
                
// Entity becomes managed again
                
unset($this->entityDeletions[$oid]);
                
$this->addToIdentityMap($entity);

                
$this->entityStates[$oid] = self::STATE_MANAGED;
                break;

            case 
self::STATE_DETACHED:
                
// Can actually not happen right now since we assume STATE_NEW.
                
throw ORMInvalidArgumentException::detachedEntityCannot($entity"persisted");

            default:
                throw new 
UnexpectedValueException("Unexpected entity state: $entityState." self::objToStr($entity));
        }

        
$this->cascadePersist($entity$visited);
    }

    
/**
     * Deletes an entity as part of the current unit of work.
     *
     * @param object $entity The entity to remove.
     *
     * @return void
     */
    
public function remove($entity)
    {
        
$visited = array();

        
$this->doRemove($entity$visited);
    }

    
/**
     * Deletes an entity as part of the current unit of work.
     *
     * This method is internally called during delete() cascades as it tracks
     * the already visited entities to prevent infinite recursions.
     *
     * @param object $entity  The entity to delete.
     * @param array  $visited The map of the already visited entities.
     *
     * @return void
     *
     * @throws ORMInvalidArgumentException If the instance is a detached entity.
     * @throws UnexpectedValueException
     */
    
private function doRemove($entity, array &$visited)
    {
        
$oid spl_object_hash($entity);

        if (isset(
$visited[$oid])) {
            return; 
// Prevent infinite recursion
        
}

        
$visited[$oid] = $entity// mark visited

        // Cascade first, because scheduleForDelete() removes the entity from the identity map, which
        // can cause problems when a lazy proxy has to be initialized for the cascade operation.
        
$this->cascadeRemove($entity$visited);

        
$class       $this->em->getClassMetadata(get_class($entity));
        
$entityState $this->getEntityState($entity);

        switch (
$entityState) {
            case 
self::STATE_NEW:
            case 
self::STATE_REMOVED:
                
// nothing to do
                
break;

            case 
self::STATE_MANAGED:
                
$invoke $this->listenersInvoker->getSubscribedSystems($classEvents::preRemove);

                if (
$invoke !== ListenersInvoker::INVOKE_NONE) {
                    
$this->listenersInvoker->invoke($classEvents::preRemove$entity, new LifecycleEventArgs($entity$this->em), $invoke);
                }

                
$this->scheduleForDelete($entity);
                break;

            case 
self::STATE_DETACHED:
                throw 
ORMInvalidArgumentException::detachedEntityCannot($entity"removed");
            default:
                throw new 
UnexpectedValueException("Unexpected entity state: $entityState." self::objToStr($entity));
        }

    }

    
/**
     * Merges the state of the given detached entity into this UnitOfWork.
     *
     * @param object $entity
     *
     * @return object The managed copy of the entity.
     *
     * @throws OptimisticLockException If the entity uses optimistic locking through a version
     *         attribute and the version check against the managed copy fails.
     *
     * @todo Require active transaction!? OptimisticLockException may result in undefined state!?
     */
    
public function merge($entity)
    {
        
$visited = array();

        return 
$this->doMerge($entity$visited);
    }

    
/**
     * convert foreign identifiers into scalar foreign key values to avoid object to string conversion failures.
     *
     * @param ClassMetadata $class
     * @param array $id
     * @return array
     */
    
private function flattenIdentifier($class$id)
    {
        
$flatId = array();

        foreach (
$id as $idField => $idValue) {
            if (isset(
$class->associationMappings[$idField])) {
                
$targetClassMetadata $this->em->getClassMetadata($class->associationMappings[$idField]['targetEntity']);
                
$associatedId        $this->getEntityIdentifier($idValue);

                
$flatId[$idField] = $associatedId[$targetClassMetadata->identifier[0]];
            } else {
                
$flatId[$idField] = $idValue;
            }
        }

        return 
$flatId;
    }

    
/**
     * Executes a merge operation on an entity.
     *
     * @param object      $entity
     * @param array       $visited
     * @param object|null $prevManagedCopy
     * @param array|null  $assoc
     *
     * @return object The managed copy of the entity.
     *
     * @throws OptimisticLockException If the entity uses optimistic locking through a version
     *         attribute and the version check against the managed copy fails.
     * @throws ORMInvalidArgumentException If the entity instance is NEW.
     * @throws EntityNotFoundException
     */
    
private function doMerge($entity, array &$visited$prevManagedCopy null$assoc null)
    {
        
$oid spl_object_hash($entity);

        if (isset(
$visited[$oid])) {
            return 
$visited[$oid]; // Prevent infinite recursion
        
}

        
$visited[$oid] = $entity// mark visited

        
$class $this->em->getClassMetadata(get_class($entity));

        
// First we assume DETACHED, although it can still be NEW but we can avoid
        // an extra db-roundtrip this way. If it is not MANAGED but has an identity,
        // we need to fetch it from the db anyway in order to merge.
        // MANAGED entities are ignored by the merge operation.
        
$managedCopy $entity;

        if (
$this->getEntityState($entityself::STATE_DETACHED) !== self::STATE_MANAGED) {
            if (
$entity instanceof Proxy && ! $entity->__isInitialized()) {
                
$this->em->getProxyFactory()->resetUninitializedProxy($entity);
                
$entity->__load();
            }

            
// Try to look the entity up in the identity map.
            
$id $class->getIdentifierValues($entity);

            
// If there is no ID, it is actually NEW.
            
if ( ! $id) {
                
$managedCopy $this->newInstance($class);

                
$this->persistNew($class$managedCopy);
            } else {
                
$flatId = ($class->containsForeignIdentifier)
                    ? 
$this->flattenIdentifier($class$id)
                    : 
$id;

                
$managedCopy $this->tryGetById($flatId$class->rootEntityName);

                if (
$managedCopy) {
                    
// We have the entity in-memory already, just make sure its not removed.
                    
if ($this->getEntityState($managedCopy) == self::STATE_REMOVED) {
                        throw 
ORMInvalidArgumentException::entityIsRemoved($managedCopy"merge");
                    }
                } else {
                    
// We need to fetch the managed copy in order to merge.
                    
$managedCopy $this->em->find($class->name$flatId);
                }

                if (
$managedCopy === null) {
                    
// If the identifier is ASSIGNED, it is NEW, otherwise an error
                    // since the managed entity was not found.
                    
if ( ! $class->isIdentifierNatural()) {
                        throw new 
EntityNotFoundException;
                    }

                    
$managedCopy $this->newInstance($class);
                    
$class->setIdentifierValues($managedCopy$id);

                    
$this->persistNew($class$managedCopy);
                } else {
                    if (
$managedCopy instanceof Proxy && ! $managedCopy->__isInitialized__) {
                        
$managedCopy->__load();
                    }
                }
            }

            if (
$class->isVersioned) {
                
$reflField          $class->reflFields[$class->versionField];
                
$managedCopyVersion $reflField->getValue($managedCopy);
                
$entityVersion      $reflField->getValue($entity);

                
// Throw exception if versions don't match.
                
if ($managedCopyVersion != $entityVersion) {
                    throw 
OptimisticLockException::lockFailedVersionMismatch($entity$entityVersion$managedCopyVersion);
                }
            }

            
// Merge state of $entity into existing (managed) entity
            
foreach ($class->reflClass->getProperties() as $prop) {
                
$name $prop->name;
                
$prop->setAccessible(true);
                if ( ! isset(
$class->associationMappings[$name])) {
                    if ( ! 
$class->isIdentifier($name)) {
                        
$prop->setValue($managedCopy$prop->getValue($entity));
                    }
                } else {
                    
$assoc2 $class->associationMappings[$name];
                    if (
$assoc2['type'] & ClassMetadata::TO_ONE) {
                        
$other $prop->getValue($entity);
                        if (
$other === null) {
                            
$prop->setValue($managedCopynull);
                        } else if (
$other instanceof Proxy && !$other->__isInitialized__) {
                            
// do not merge fields marked lazy that have not been fetched.
                            
continue;
                        } else if ( ! 
$assoc2['isCascadeMerge']) {
                            if (
$this->getEntityState($other) === self::STATE_DETACHED) {
                                
$targetClass $this->em->getClassMetadata($assoc2['targetEntity']);
                                
$relatedId $targetClass->getIdentifierValues($other);

                                if (
$targetClass->subClasses) {
                                    
$other $this->em->find($targetClass->name$relatedId);
                                } else {
                                    
$other $this->em->getProxyFactory()->getProxy($assoc2['targetEntity'], $relatedId);
                                    
$this->registerManaged($other$relatedId, array());
                                }
                            }

                            
$prop->setValue($managedCopy$other);
                        }
                    } else {
                        
$mergeCol $prop->getValue($entity);
                        if (
$mergeCol instanceof PersistentCollection && !$mergeCol->isInitialized()) {
                            
// do not merge fields marked lazy that have not been fetched.
                            // keep the lazy persistent collection of the managed copy.
                            
continue;
                        }

                        
$managedCol $prop->getValue($managedCopy);
                        if (!
$managedCol) {
                            
$managedCol = new PersistentCollection($this->em,
                                    
$this->em->getClassMetadata($assoc2['targetEntity']),
                                    new 
ArrayCollection
                                    
);
                            
$managedCol->setOwner($managedCopy$assoc2);
                            
$prop->setValue($managedCopy$managedCol);
                            
$this->originalEntityData[$oid][$name] = $managedCol;
                        }
                        if (
$assoc2['isCascadeMerge']) {
                            
$managedCol->initialize();

                            
// clear and set dirty a managed collection if its not also the same collection to merge from.
                            
if (!$managedCol->isEmpty() && $managedCol !== $mergeCol) {
                                
$managedCol->unwrap()->clear();
                                
$managedCol->setDirty(true);

                                if (
$assoc2['isOwningSide'] && $assoc2['type'] == ClassMetadata::MANY_TO_MANY && $class->isChangeTrackingNotify()) {
                                    
$this->scheduleForDirtyCheck($managedCopy);
                                }
                            }
                        }
                    }
                }

                if (
$class->isChangeTrackingNotify()) {
                    
// Just treat all properties as changed, there is no other choice.
                    
$this->propertyChanged($managedCopy$namenull$prop->getValue($managedCopy));
                }
            }

            if (
$class->isChangeTrackingDeferredExplicit()) {
                
$this->scheduleForDirtyCheck($entity);
            }
        }

        if (
$prevManagedCopy !== null) {
            
$assocField $assoc['fieldName'];
            
$prevClass $this->em->getClassMetadata(get_class($prevManagedCopy));

            if (
$assoc['type'] & ClassMetadata::TO_ONE) {
                
$prevClass->reflFields[$assocField]->setValue($prevManagedCopy$managedCopy);
            } else {
                
$prevClass->reflFields[$assocField]->getValue($prevManagedCopy)->add($managedCopy);

                if (
$assoc['type'] == ClassMetadata::ONE_TO_MANY) {
                    
$class->reflFields[$assoc['mappedBy']]->setValue($managedCopy$prevManagedCopy);
                }
            }
        }

        
// Mark the managed copy visited as well
        
$visited[spl_object_hash($managedCopy)] = true;

        
$this->cascadeMerge($entity$managedCopy$visited);

        return 
$managedCopy;
    }

    
/**
     * Detaches an entity from the persistence management. It's persistence will
     * no longer be managed by Doctrine.
     *
     * @param object $entity The entity to detach.
     *
     * @return void
     */
    
public function detach($entity)
    {
        
$visited = array();

        
$this->doDetach($entity$visited);
    }

    
/**
     * Executes a detach operation on the given entity.
     *
     * @param object  $entity
     * @param array   $visited
     * @param boolean $noCascade if true, don't cascade detach operation.
     *
     * @return void
     */
    
private function doDetach($entity, array &$visited$noCascade false)
    {
        
$oid spl_object_hash($entity);

        if (isset(
$visited[$oid])) {
            return; 
// Prevent infinite recursion
        
}

        
$visited[$oid] = $entity// mark visited

        
switch ($this->getEntityState($entityself::STATE_DETACHED)) {
            case 
self::STATE_MANAGED:
                if (
$this->isInIdentityMap($entity)) {
                    
$this->removeFromIdentityMap($entity);
                }

                unset(
                    
$this->entityInsertions[$oid],
                    
$this->entityUpdates[$oid],
                    
$this->entityDeletions[$oid],
                    
$this->entityIdentifiers[$oid],
                    
$this->entityStates[$oid],
                    
$this->originalEntityData[$oid]
                );
                break;
            case 
self::STATE_NEW:
            case 
self::STATE_DETACHED:
                return;
        }

        if ( ! 
$noCascade) {
            
$this->cascadeDetach($entity$visited);
        }
    }

    
/**
     * Refreshes the state of the given entity from the database, overwriting
     * any local, unpersisted changes.
     *
     * @param object $entity The entity to refresh.
     *
     * @return void
     *
     * @throws InvalidArgumentException If the entity is not MANAGED.
     */
    
public function refresh($entity)
    {
        
$visited = array();

        
$this->doRefresh($entity$visited);
    }

    
/**
     * Executes a refresh operation on an entity.
     *
     * @param object $entity  The entity to refresh.
     * @param array  $visited The already visited entities during cascades.
     *
     * @return void
     *
     * @throws ORMInvalidArgumentException If the entity is not MANAGED.
     */
    
private function doRefresh($entity, array &$visited)
    {
        
$oid spl_object_hash($entity);

        if (isset(
$visited[$oid])) {
            return; 
// Prevent infinite recursion
        
}

        
$visited[$oid] = $entity// mark visited

        
$class $this->em->getClassMetadata(get_class($entity));

        if (
$this->getEntityState($entity) !== self::STATE_MANAGED) {
            throw 
ORMInvalidArgumentException::entityNotManaged($entity);
        }

        
$this->getEntityPersister($class->name)->refresh(
            
array_combine($class->getIdentifierFieldNames(), $this->entityIdentifiers[$oid]),
            
$entity
        
);

        
$this->cascadeRefresh($entity$visited);
    }

    
/**
     * Cascades a refresh operation to associated entities.
     *
     * @param object $entity
     * @param array  $visited
     *
     * @return void
     */
    
private function cascadeRefresh($entity, array &$visited)
    {
        
$class $this->em->getClassMetadata(get_class($entity));

        
$associationMappings array_filter(
            
$class->associationMappings,
            function (
$assoc) { return $assoc['isCascadeRefresh']; }
        );

        foreach (
$associationMappings as $assoc) {
            
$relatedEntities $class->reflFields[$assoc['fieldName']]->getValue($entity);

            switch (
true) {
                case (
$relatedEntities instanceof PersistentCollection):
                    
// Unwrap so that foreach() does not initialize
                    
$relatedEntities $relatedEntities->unwrap();
                    
// break; is commented intentionally!

                
case ($relatedEntities instanceof Collection):
                case (
is_array($relatedEntities)):
                    foreach (
$relatedEntities as $relatedEntity) {
                        
$this->doRefresh($relatedEntity$visited);
                    }
                    break;

                case (
$relatedEntities !== null):
                    
$this->doRefresh($relatedEntities$visited);
                    break;

                default:
                    
// Do nothing
            
}
        }
    }

    
/**
     * Cascades a detach operation to associated entities.
     *
     * @param object $entity
     * @param array  $visited
     *
     * @return void
     */
    
private function cascadeDetach($entity, array &$visited)
    {
        
$class $this->em->getClassMetadata(get_class($entity));

        
$associationMappings array_filter(
            
$class->associationMappings,
            function (
$assoc) { return $assoc['isCascadeDetach']; }
        );

        foreach (
$associationMappings as $assoc) {
            
$relatedEntities $class->reflFields[$assoc['fieldName']]->getValue($entity);

            switch (
true) {
                case (
$relatedEntities instanceof PersistentCollection):
                    
// Unwrap so that foreach() does not initialize
                    
$relatedEntities $relatedEntities->unwrap();
                    
// break; is commented intentionally!

                
case ($relatedEntities instanceof Collection):
                case (
is_array($relatedEntities)):
                    foreach (
$relatedEntities as $relatedEntity) {
                        
$this->doDetach($relatedEntity$visited);
                    }
                    break;

                case (
$relatedEntities !== null):
                    
$this->doDetach($relatedEntities$visited);
                    break;

                default:
                    
// Do nothing
            
}
        }
    }

    
/**
     * Cascades a merge operation to associated entities.
     *
     * @param object $entity
     * @param object $managedCopy
     * @param array  $visited
     *
     * @return void
     */
    
private function cascadeMerge($entity$managedCopy, array &$visited)
    {
        
$class $this->em->getClassMetadata(get_class($entity));

        
$associationMappings array_filter(
            
$class->associationMappings,
            function (
$assoc) { return $assoc['isCascadeMerge']; }
        );

        foreach (
$associationMappings as $assoc) {
            
$relatedEntities $class->reflFields[$assoc['fieldName']]->getValue($entity);

            if (
$relatedEntities instanceof Collection) {
                if (
$relatedEntities === $class->reflFields[$assoc['fieldName']]->getValue($managedCopy)) {
                    continue;
                }

                if (
$relatedEntities instanceof PersistentCollection) {
                    
// Unwrap so that foreach() does not initialize
                    
$relatedEntities $relatedEntities->unwrap();
                }

                foreach (
$relatedEntities as $relatedEntity) {
                    
$this->doMerge($relatedEntity$visited$managedCopy$assoc);
                }
            } else if (
$relatedEntities !== null) {
                
$this->doMerge($relatedEntities$visited$managedCopy$assoc);
            }
        }
    }

    
/**
     * Cascades the save operation to associated entities.
     *
     * @param object $entity
     * @param array  $visited
     *
     * @return void
     */
    
private function cascadePersist($entity, array &$visited)
    {
        
$class $this->em->getClassMetadata(get_class($entity));

        
$associationMappings array_filter(
            
$class->associationMappings,
            function (
$assoc) { return $assoc['isCascadePersist']; }
        );

        foreach (
$associationMappings as $assoc) {
            
$relatedEntities $class->reflFields[$assoc['fieldName']]->getValue($entity);

            switch (
true) {
                case (
$relatedEntities instanceof PersistentCollection):
                    
// Unwrap so that foreach() does not initialize
                    
$relatedEntities $relatedEntities->unwrap();
                    
// break; is commented intentionally!

                
case ($relatedEntities instanceof Collection):
                case (
is_array($relatedEntities)):
                    foreach (
$relatedEntities as $relatedEntity) {
                        
$this->doPersist($relatedEntity$visited);
                    }
                    break;

                case (
$relatedEntities !== null):
                    
$this->doPersist($relatedEntities$visited);
                    break;

                default:
                    
// Do nothing
            
}
        }
    }

    
/**
     * Cascades the delete operation to associated entities.
     *
     * @param object $entity
     * @param array  $visited
     *
     * @return void
     */
    
private function cascadeRemove($entity, array &$visited)
    {
        
$class $this->em->getClassMetadata(get_class($entity));

        
$associationMappings array_filter(
            
$class->associationMappings,
            function (
$assoc) { return $assoc['isCascadeRemove']; }
        );

        
$entitiesToCascade = array();

        foreach (
$associationMappings as $assoc) {
            if (
$entity instanceof Proxy && !$entity->__isInitialized__) {
                
$entity->__load();
            }

            
$relatedEntities $class->reflFields[$assoc['fieldName']]->getValue($entity);

            switch (
true) {
                case (
$relatedEntities instanceof Collection):
                case (
is_array($relatedEntities)):
                    
// If its a PersistentCollection initialization is intended! No unwrap!
                    
foreach ($relatedEntities as $relatedEntity) {
                        
$entitiesToCascade[] = $relatedEntity;
                    }
                    break;

                case (
$relatedEntities !== null):
                    
$entitiesToCascade[] = $relatedEntities;
                    break;

                default:
                    
// Do nothing
            
}
        }

        foreach (
$entitiesToCascade as $relatedEntity) {
            
$this->doRemove($relatedEntity$visited);
        }
    }

    
/**
     * Acquire a lock on the given entity.
     *
     * @param object $entity
     * @param int    $lockMode
     * @param int    $lockVersion
     *
     * @return void
     *
     * @throws ORMInvalidArgumentException
     * @throws TransactionRequiredException
     * @throws OptimisticLockException
     */
    
public function lock($entity$lockMode$lockVersion null)
    {
        if (
$entity === null) {
            throw new 
InvalidArgumentException("No entity passed to UnitOfWork#lock().");
        }

        if (
$this->getEntityState($entityself::STATE_DETACHED) != self::STATE_MANAGED) {
            throw 
ORMInvalidArgumentException::entityNotManaged($entity);
        }

        
$class $this->em->getClassMetadata(get_class($entity));

        switch (
$lockMode) {
            case 
DoctrineDBALLockMode::OPTIMISTIC;
                if ( ! 
$class->isVersioned) {
                    throw 
OptimisticLockException::notVersioned($class->name);
                }

                if (
$lockVersion === null) {
                    return;
                }

                if (
$entity instanceof Proxy && !$entity->__isInitialized__) {
                    
$entity->__load();
                }

                
$entityVersion $class->reflFields[$class->versionField]->getValue($entity);

                if (
$entityVersion != $lockVersion) {
                    throw 
OptimisticLockException::lockFailedVersionMismatch($entity$lockVersion$entityVersion);
                }

                break;

            case 
DoctrineDBALLockMode::PESSIMISTIC_READ:
            case 
DoctrineDBALLockMode::PESSIMISTIC_WRITE:
                if (!
$this->em->getConnection()->isTransactionActive()) {
                    throw 
TransactionRequiredException::transactionRequired();
                }

                
$oid spl_object_hash($entity);

                
$this->getEntityPersister($class->name)->lock(
                    
array_combine($class->getIdentifierFieldNames(), $this->entityIdentifiers[$oid]),
                    
$lockMode
                
);
                break;

            default:
                
// Do nothing
        
}
    }

    
/**
     * Gets the CommitOrderCalculator used by the UnitOfWork to order commits.
     *
     * @return DoctrineORMInternalCommitOrderCalculator
     */
    
public function getCommitOrderCalculator()
    {
        if (
$this->commitOrderCalculator === null) {
            
$this->commitOrderCalculator = new InternalCommitOrderCalculator;
        }

        return 
$this->commitOrderCalculator;
    }

    
/**
     * Clears the UnitOfWork.
     *
     * @param string|null $entityName if given, only entities of this type will get detached.
     *
     * @return void
     */
    
public function clear($entityName null)
    {
        if (
$entityName === null) {
            
$this->identityMap =
            
$this->entityIdentifiers =
            
$this->originalEntityData =
            
$this->entityChangeSets =
            
$this->entityStates =
            
$this->scheduledForDirtyCheck =
            
$this->entityInsertions =
            
$this->entityUpdates =
            
$this->entityDeletions =
            
$this->collectionDeletions =
            
$this->collectionUpdates =
            
$this->extraUpdates =
            
$this->readOnlyObjects =
            
$this->visitedCollections =
            
$this->orphanRemovals = array();

            if (
$this->commitOrderCalculator !== null) {
                
$this->commitOrderCalculator->clear();
            }
        } else {
            
$visited = array();
            foreach (
$this->identityMap as $className => $entities) {
                if (
$className === $entityName) {
                    foreach (
$entities as $entity) {
                        
$this->doDetach($entity$visitedtrue);
                    }
                }
            }
        }

        if (
$this->evm->hasListeners(Events::onClear)) {
            
$this->evm->dispatchEvent(Events::onClear, new EventOnClearEventArgs($this->em$entityName));
        }
    }

    
/**
     * INTERNAL:
     * Schedules an orphaned entity for removal. The remove() operation will be
     * invoked on that entity at the beginning of the next commit of this
     * UnitOfWork.
     *
     * @ignore
     *
     * @param object $entity
     *
     * @return void
     */
    
public function scheduleOrphanRemoval($entity)
    {
        
$this->orphanRemovals[spl_object_hash($entity)] = $entity;
    }

    
/**
     * INTERNAL:
     * Schedules a complete collection for removal when this UnitOfWork commits.
     *
     * @param PersistentCollection $coll
     *
     * @return void
     */
    
public function scheduleCollectionDeletion(PersistentCollection $coll)
    {
        
$coid spl_object_hash($coll);

        
//TODO: if $coll is already scheduled for recreation ... what to do?
        // Just remove $coll from the scheduled recreations?
        
if (isset($this->collectionUpdates[$coid])) {
            unset(
$this->collectionUpdates[$coid]);
        }

        
$this->collectionDeletions[$coid] = $coll;
    }

    
/**
     * @param PersistentCollection $coll
     *
     * @return bool
     */
    
public function isCollectionScheduledForDeletion(PersistentCollection $coll)
    {
        return isset(
$this->collectionDeletions[spl_object_hash($coll)]);
    }

    
/**
     * @param ClassMetadata $class
     *
     * @return DoctrineCommonPersistenceObjectManagerAware|object
     */
    
private function newInstance($class)
    {
        
$entity $class->newInstance();

        if (
$entity instanceof DoctrineCommonPersistenceObjectManagerAware) {
            
$entity->injectObjectManager($this->em$class);
        }

        return 
$entity;
    }

    
/**
     * INTERNAL:
     * Creates an entity. Used for reconstitution of persistent entities.
     *
     * @ignore
     *
     * @param string $className The name of the entity class.
     * @param array  $data      The data for the entity.
     * @param array  $hints     Any hints to account for during reconstitution/lookup of the entity.
     *
     * @return object The managed entity instance.
     *
     * @internal Highly performance-sensitive method.
     *
     * @todo Rename: getOrCreateEntity
     */
    
public function createEntity($className, array $data, &$hints = array())
    {
        
$class $this->em->getClassMetadata($className);
        
//$isReadOnly = isset($hints[Query::HINT_READ_ONLY]);

        
if ($class->isIdentifierComposite) {
            
$id = array();

            foreach (
$class->identifier as $fieldName) {
                
$id[$fieldName] = isset($class->associationMappings[$fieldName])
                    ? 
$data[$class->associationMappings[$fieldName]['joinColumns'][0]['name']]
                    : 
$data[$fieldName];
            }
        } else {
            
$id = isset($class->associationMappings[$class->identifier[0]])
                ? 
$data[$class->associationMappings[$class->identifier[0]]['joinColumns'][0]['name']]
                : 
$data[$class->identifier[0]];

            
$id = array($class->identifier[0] => $id);
        }

        
$idHash implode(' '$id);

        if (isset(
$this->identityMap[$class->rootEntityName][$idHash])) {
            
$entity $this->identityMap[$class->rootEntityName][$idHash];
            
$oid spl_object_hash($entity);

            if (
                isset(
$hints[Query::HINT_REFRESH])
                && isset(
$hints[Query::HINT_REFRESH_ENTITY])
                && (
$unmanagedProxy $hints[Query::HINT_REFRESH_ENTITY]) !== $entity
                
&& $unmanagedProxy instanceof Proxy
                
&& $this->isIdentifierEquals($unmanagedProxy$entity)
            ) {
                
// DDC-1238 - we have a managed instance, but it isn't the provided one.
                // Therefore we clear its identifier. Also, we must re-fetch metadata since the
                // refreshed object may be anything

                
foreach ($class->identifier as $fieldName) {
                    
$class->reflFields[$fieldName]->setValue($unmanagedProxynull);
                }

                return 
$unmanagedProxy;
            }

            if (
$entity instanceof Proxy && ! $entity->__isInitialized()) {
                
$entity->__setInitialized(true);

                
$overrideLocalValues true;

                if (
$entity instanceof NotifyPropertyChanged) {
                    
$entity->addPropertyChangedListener($this);
                }

                
// inject ObjectManager into just loaded proxies.
                
if ($overrideLocalValues && $entity instanceof ObjectManagerAware) {
                    
$entity->injectObjectManager($this->em$class);
                }

            } else {
                
$overrideLocalValues = isset($hints[Query::HINT_REFRESH]);

                
// If only a specific entity is set to refresh, check that it's the one
                
if(isset($hints[Query::HINT_REFRESH_ENTITY])) {
                    
$overrideLocalValues $hints[Query::HINT_REFRESH_ENTITY] === $entity;
                }

                
// inject ObjectManager upon refresh.
                
if ($overrideLocalValues && $entity instanceof ObjectManagerAware) {
                    
$entity->injectObjectManager($this->em$class);
                }
            }

            if (
$overrideLocalValues) {
                
$this->originalEntityData[$oid] = $data;
            }
        } else {
            
$entity $this->newInstance($class);
            
$oid    spl_object_hash($entity);

            
$this->entityIdentifiers[$oid]  = $id;
            
$this->entityStates[$oid]       = self::STATE_MANAGED;
            
$this->originalEntityData[$oid] = $data;

            
$this->identityMap[$class->rootEntityName][$idHash] = $entity;

            if (
$entity instanceof NotifyPropertyChanged) {
                
$entity->addPropertyChangedListener($this);
            }

            
$overrideLocalValues true;
        }

        if ( ! 
$overrideLocalValues) {
            return 
$entity;
        }

        foreach (
$data as $field => $value) {
            if (isset(
$class->fieldMappings[$field])) {
                
$class->reflFields[$field]->setValue($entity$value);
            }
        }

        
// Loading the entity right here, if its in the eager loading map get rid of it there.
        
unset($this->eagerLoadingEntities[$class->rootEntityName][$idHash]);

        if (isset(
$this->eagerLoadingEntities[$class->rootEntityName]) && ! $this->eagerLoadingEntities[$class->rootEntityName]) {
            unset(
$this->eagerLoadingEntities[$class->rootEntityName]);
        }

        
// Properly initialize any unfetched associations, if partial objects are not allowed.
        
if (isset($hints[Query::HINT_FORCE_PARTIAL_LOAD])) {
            return 
$entity;
        }

        foreach (
$class->associationMappings as $field => $assoc) {
            
// Check if the association is not among the fetch-joined associations already.
            
if (isset($hints['fetchAlias']) && isset($hints['fetched'][$hints['fetchAlias']][$field])) {
                continue;
            }

            
$targetClass $this->em->getClassMetadata($assoc['targetEntity']);

            switch (
true) {
                case (
$assoc['type'] & ClassMetadata::TO_ONE):
                    if ( ! 
$assoc['isOwningSide']) {
                        
// Inverse side of x-to-one can never be lazy
                        
$class->reflFields[$field]->setValue($entity$this->getEntityPersister($assoc['targetEntity'])->loadOneToOneEntity($assoc$entity));

                        continue 
2;
                    }

                    
$associatedId = array();

                    
// TODO: Is this even computed right in all cases of composite keys?
                    
foreach ($assoc['targetToSourceKeyColumns'] as $targetColumn => $srcColumn) {
                        
$joinColumnValue = isset($data[$srcColumn]) ? $data[$srcColumn] : null;

                        if (
$joinColumnValue !== null) {
                            if (
$targetClass->containsForeignIdentifier) {
                                
$associatedId[$targetClass->getFieldForColumn($targetColumn)] = $joinColumnValue;
                            } else {
                                
$associatedId[$targetClass->fieldNames[$targetColumn]] = $joinColumnValue;
                            }
                        }
                    }

                    if ( ! 
$associatedId) {
                        
// Foreign key is NULL
                        
$class->reflFields[$field]->setValue($entitynull);
                        
$this->originalEntityData[$oid][$field] = null;

                        continue;
                    }

                    if ( ! isset(
$hints['fetchMode'][$class->name][$field])) {
                        
$hints['fetchMode'][$class->name][$field] = $assoc['fetch'];
                    }

                    
// Foreign key is set
                    // Check identity map first
                    // FIXME: Can break easily with composite keys if join column values are in
                    //        wrong order. The correct order is the one in ClassMetadata#identifier.
                    
$relatedIdHash implode(' '$associatedId);

                    switch (
true) {
                        case (isset(
$this->identityMap[$targetClass->rootEntityName][$relatedIdHash])):
                            
$newValue $this->identityMap[$targetClass->rootEntityName][$relatedIdHash];

                            
// If this is an uninitialized proxy, we are deferring eager loads,
                            // this association is marked as eager fetch, and its an uninitialized proxy (wtf!)
                            // then we can append this entity for eager loading!
                            
if ($hints['fetchMode'][$class->name][$field] == ClassMetadata::FETCH_EAGER &&
                                isset(
$hints[self::HINT_DEFEREAGERLOAD]) &&
                                !
$targetClass->isIdentifierComposite &&
                                
$newValue instanceof Proxy &&
                                
$newValue->__isInitialized__ === false) {

                                
$this->eagerLoadingEntities[$targetClass->rootEntityName][$relatedIdHash] = current($associatedId);
                            }

                            break;

                        case (
$targetClass->subClasses):
                            
// If it might be a subtype, it can not be lazy. There isn't even
                            // a way to solve this with deferred eager loading, which means putting
                            // an entity with subclasses at a *-to-one location is really bad! (performance-wise)
                            
$newValue $this->getEntityPersister($assoc['targetEntity'])->loadOneToOneEntity($assoc$entity$associatedId);
                            break;

                        default:
                            switch (
true) {
                                
// We are negating the condition here. Other cases will assume it is valid!
                                
case ($hints['fetchMode'][$class->name][$field] !== ClassMetadata::FETCH_EAGER):
                                    
$newValue $this->em->getProxyFactory()->getProxy($assoc['targetEntity'], $associatedId);
                                    break;

                                
// Deferred eager load only works for single identifier classes
                                
case (isset($hints[self::HINT_DEFEREAGERLOAD]) && ! $targetClass->isIdentifierComposite):
                                    
// TODO: Is there a faster approach?
                                    
$this->eagerLoadingEntities[$targetClass->rootEntityName][$relatedIdHash] = current($associatedId);

                                    
$newValue $this->em->getProxyFactory()->getProxy($assoc['targetEntity'], $associatedId);
                                    break;

                                default:
                                    
// TODO: This is very imperformant, ignore it?
                                    
$newValue $this->em->find($assoc['targetEntity'], $associatedId);
                                    break;
                            }

                            
// PERF: Inlined & optimized code from UnitOfWork#registerManaged()
                            
$newValueOid spl_object_hash($newValue);
                            
$this->entityIdentifiers[$newValueOid] = $associatedId;
                            
$this->identityMap[$targetClass->rootEntityName][$relatedIdHash] = $newValue;

                            if (
                                
$newValue instanceof NotifyPropertyChanged &&
                                ( ! 
$newValue instanceof Proxy || $newValue->__isInitialized())
                            ) {
                                
$newValue->addPropertyChangedListener($this);
                            }
                            
$this->entityStates[$newValueOid] = self::STATE_MANAGED;
                            
// make sure that when an proxy is then finally loaded, $this->originalEntityData is set also!
                            
break;
                    }

                    
$this->originalEntityData[$oid][$field] = $newValue;
                    
$class->reflFields[$field]->setValue($entity$newValue);

                    if (
$assoc['inversedBy'] && $assoc['type'] & ClassMetadata::ONE_TO_ONE) {
                        
$inverseAssoc $targetClass->associationMappings[$assoc['inversedBy']];
                        
$targetClass->reflFields[$inverseAssoc['fieldName']]->setValue($newValue$entity);
                    }

                    break;

                default:
                    
// Inject collection
                    
$pColl = new PersistentCollection($this->em$targetClass, new ArrayCollection);
                    
$pColl->setOwner($entity$assoc);
                    
$pColl->setInitialized(false);

                    
$reflField $class->reflFields[$field];
                    
$reflField->setValue($entity$pColl);

                    if (
$assoc['fetch'] == ClassMetadata::FETCH_EAGER) {
                        
$this->loadCollection($pColl);
                        
$pColl->takeSnapshot();
                    }

                    
$this->originalEntityData[$oid][$field] = $pColl;
                    break;
            }
        }

        if (
$overrideLocalValues) {
            
$invoke $this->listenersInvoker->getSubscribedSystems($classEvents::postLoad);

            if (
$invoke !== ListenersInvoker::INVOKE_NONE) {
                
$this->listenersInvoker->invoke($classEvents::postLoad$entity, new LifecycleEventArgs($entity$this->em), $invoke);
            }
        }

        return 
$entity;
    }

    
/**
     * @return void
     */
    
public function triggerEagerLoads()
    {
        if ( ! 
$this->eagerLoadingEntities) {
            return;
        }

        
// avoid infinite recursion
        
$eagerLoadingEntities       $this->eagerLoadingEntities;
        
$this->eagerLoadingEntities = array();

        foreach (
$eagerLoadingEntities as $entityName => $ids) {
            if ( ! 
$ids) {
                continue;
            }

            
$class $this->em->getClassMetadata($entityName);

            
$this->getEntityPersister($entityName)->loadAll(
                
array_combine($class->identifier, array(array_values($ids)))
            );
        }
    }

    
/**
     * Initializes (loads) an uninitialized persistent collection of an entity.
     *
     * @param DoctrineORMPersistentCollection $collection The collection to initialize.
     *
     * @return void
     *
     * @todo Maybe later move to EntityManager#initialize($proxyOrCollection). See DDC-733.
     */
    
public function loadCollection(PersistentCollection $collection)
    {
        
$assoc     $collection->getMapping();
        
$persister $this->getEntityPersister($assoc['targetEntity']);

        switch (
$assoc['type']) {
            case 
ClassMetadata::ONE_TO_MANY:
                
$persister->loadOneToManyCollection($assoc$collection->getOwner(), $collection);
                break;

            case 
ClassMetadata::MANY_TO_MANY:
                
$persister->loadManyToManyCollection($assoc$collection->getOwner(), $collection);
                break;
        }

        
$collection->setInitialized(true);
    }

    
/**
     * Gets the identity map of the UnitOfWork.
     *
     * @return array
     */
    
public function getIdentityMap()
    {
        return 
$this->identityMap;
    }

    
/**
     * Gets the original data of an entity. The original data is the data that was
     * present at the time the entity was reconstituted from the database.
     *
     * @param object $entity
     *
     * @return array
     */
    
public function getOriginalEntityData($entity)
    {
        
$oid spl_object_hash($entity);

        if (isset(
$this->originalEntityData[$oid])) {
            return 
$this->originalEntityData[$oid];
        }

        return array();
    }

    
/**
     * @ignore
     *
     * @param object $entity
     * @param array  $data
     *
     * @return void
     */
    
public function setOriginalEntityData($entity, array $data)
    {
        
$this->originalEntityData[spl_object_hash($entity)] = $data;
    }

    
/**
     * INTERNAL:
     * Sets a property value of the original data array of an entity.
     *
     * @ignore
     *
     * @param string $oid
     * @param string $property
     * @param mixed  $value
     *
     * @return void
     */
    
public function setOriginalEntityProperty($oid$property$value)
    {
        
$this->originalEntityData[$oid][$property] = $value;
    }

    
/**
     * Gets the identifier of an entity.
     * The returned value is always an array of identifier values. If the entity
     * has a composite identifier then the identifier values are in the same
     * order as the identifier field names as returned by ClassMetadata#getIdentifierFieldNames().
     *
     * @param object $entity
     *
     * @return array The identifier values.
     */
    
public function getEntityIdentifier($entity)
    {
        return 
$this->entityIdentifiers[spl_object_hash($entity)];
    }

    
/**
     * Processes an entity instance to extract their identifier values.
     *
     * @param object $entity The entity instance.
     *
     * @return mixed A scalar value.
     *
     * @throws DoctrineORMORMInvalidArgumentException
     */
    
public function getSingleIdentifierValue($entity)
    {
        
$class $this->em->getClassMetadata(get_class($entity));

        if (
$class->isIdentifierComposite) {
            throw 
ORMInvalidArgumentException::invalidCompositeIdentifier();
        }

        
$values $this->isInIdentityMap($entity)
            ? 
$this->getEntityIdentifier($entity)
            : 
$class->getIdentifierValues($entity);

        return isset(
$values[$class->identifier[0]]) ? $values[$class->identifier[0]] : null;
    }
 
    
/**
     * Tries to find an entity with the given identifier in the identity map of
     * this UnitOfWork.
     *
     * @param mixed  $id            The entity identifier to look for.
     * @param string $rootClassName The name of the root class of the mapped entity hierarchy.
     *
     * @return object|bool Returns the entity with the specified identifier if it exists in
     *                     this UnitOfWork, FALSE otherwise.
     */
    
public function tryGetById($id$rootClassName)
    {
        
$idHash implode(' ', (array) $id);

        if (isset(
$this->identityMap[$rootClassName][$idHash])) {
            return 
$this->identityMap[$rootClassName][$idHash];
        }

        return 
false;
    }

    
/**
     * Schedules an entity for dirty-checking at commit-time.
     *
     * @param object $entity The entity to schedule for dirty-checking.
     *
     * @return void
     *
     * @todo Rename: scheduleForSynchronization
     */
    
public function scheduleForDirtyCheck($entity)
    {
        
$rootClassName $this->em->getClassMetadata(get_class($entity))->rootEntityName;

        
$this->scheduledForDirtyCheck[$rootClassName][spl_object_hash($entity)] = $entity;
    }

    
/**
     * Checks whether the UnitOfWork has any pending insertions.
     *
     * @return boolean TRUE if this UnitOfWork has pending insertions, FALSE otherwise.
     */
    
public function hasPendingInsertions()
    {
        return ! empty(
$this->entityInsertions);
    }

    
/**
     * Calculates the size of the UnitOfWork. The size of the UnitOfWork is the
     * number of entities in the identity map.
     *
     * @return integer
     */
    
public function size()
    {
        
$countArray array_map(function ($item) { return count($item); }, $this->identityMap);

        return 
array_sum($countArray);
    }

    
/**
     * Gets the EntityPersister for an Entity.
     *
     * @param string $entityName The name of the Entity.
     *
     * @return DoctrineORMPersistersBasicEntityPersister
     */
    
public function getEntityPersister($entityName)
    {
        if (isset(
$this->persisters[$entityName])) {
            return 
$this->persisters[$entityName];
        }

        
$class $this->em->getClassMetadata($entityName);

        switch (
true) {
            case (
$class->isInheritanceTypeNone()):
                
$persister = new PersistersBasicEntityPersister($this->em$class);
                break;

            case (
$class->isInheritanceTypeSingleTable()):
                
$persister = new PersistersSingleTablePersister($this->em$class);
                break;

            case (
$class->isInheritanceTypeJoined()):
                
$persister = new PersistersJoinedSubclassPersister($this->em$class);
                break;

            default:
                
$persister = new PersistersUnionSubclassPersister($this->em$class);
        }

        
$this->persisters[$entityName] = $persister;

        return 
$this->persisters[$entityName];
    }

    
/**
     * Gets a collection persister for a collection-valued association.
     *
     * @param array $association
     *
     * @return DoctrineORMPersistersAbstractCollectionPersister
     */
    
public function getCollectionPersister(array $association)
    {
        
$type $association['type'];

        if (isset(
$this->collectionPersisters[$type])) {
            return 
$this->collectionPersisters[$type];
        }

        switch (
$type) {
            case 
ClassMetadata::ONE_TO_MANY:
                
$persister = new PersistersOneToManyPersister($this->em);
                break;

            case 
ClassMetadata::MANY_TO_MANY:
                
$persister = new PersistersManyToManyPersister($this->em);
                break;
        }

        
$this->collectionPersisters[$type] = $persister;

        return 
$this->collectionPersisters[$type];
    }

    
/**
     * INTERNAL:
     * Registers an entity as managed.
     *
     * @param object $entity The entity.
     * @param array  $id     The identifier values.
     * @param array  $data   The original entity data.
     *
     * @return void
     */
    
public function registerManaged($entity, array $id, array $data)
    {
        
$oid spl_object_hash($entity);

        
$this->entityIdentifiers[$oid]  = $id;
        
$this->entityStates[$oid]       = self::STATE_MANAGED;
        
$this->originalEntityData[$oid] = $data;

        
$this->addToIdentityMap($entity);

        if (
$entity instanceof NotifyPropertyChanged && ( ! $entity instanceof Proxy || $entity->__isInitialized())) {
            
$entity->addPropertyChangedListener($this);
        }
    }

    
/**
     * INTERNAL:
     * Clears the property changeset of the entity with the given OID.
     *
     * @param string $oid The entity's OID.
     *
     * @return void
     */
    
public function clearEntityChangeSet($oid)
    {
        
$this->entityChangeSets[$oid] = array();
    }

    
/* PropertyChangedListener implementation */

    /**
     * Notifies this UnitOfWork of a property change in an entity.
     *
     * @param object $entity       The entity that owns the property.
     * @param string $propertyName The name of the property that changed.
     * @param mixed  $oldValue     The old value of the property.
     * @param mixed  $newValue     The new value of the property.
     *
     * @return void
     */
    
public function propertyChanged($entity$propertyName$oldValue$newValue)
    {
        
$oid   spl_object_hash($entity);
        
$class $this->em->getClassMetadata(get_class($entity));

        
$isAssocField = isset($class->associationMappings[$propertyName]);

        if ( ! 
$isAssocField && ! isset($class->fieldMappings[$propertyName])) {
            return; 
// ignore non-persistent fields
        
}

        
// Update changeset and mark entity for synchronization
        
$this->entityChangeSets[$oid][$propertyName] = array($oldValue$newValue);

        if ( ! isset(
$this->scheduledForDirtyCheck[$class->rootEntityName][$oid])) {
            
$this->scheduleForDirtyCheck($entity);
        }
    }

    
/**
     * Gets the currently scheduled entity insertions in this UnitOfWork.
     *
     * @return array
     */
    
public function getScheduledEntityInsertions()
    {
        return 
$this->entityInsertions;
    }

    
/**
     * Gets the currently scheduled entity updates in this UnitOfWork.
     *
     * @return array
     */
    
public function getScheduledEntityUpdates()
    {
        return 
$this->entityUpdates;
    }

    
/**
     * Gets the currently scheduled entity deletions in this UnitOfWork.
     *
     * @return array
     */
    
public function getScheduledEntityDeletions()
    {
        return 
$this->entityDeletions;
    }

    
/**
     * Gets the currently scheduled complete collection deletions
     *
     * @return array
     */
    
public function getScheduledCollectionDeletions()
    {
        return 
$this->collectionDeletions;
    }

    
/**
     * Gets the currently scheduled collection inserts, updates and deletes.
     *
     * @return array
     */
    
public function getScheduledCollectionUpdates()
    {
        return 
$this->collectionUpdates;
    }

    
/**
     * Helper method to initialize a lazy loading proxy or persistent collection.
     *
     * @param object $obj
     *
     * @return void
     */
    
public function initializeObject($obj)
    {
        if (
$obj instanceof Proxy) {
            
$obj->__load();

            return;
        }

        if (
$obj instanceof PersistentCollection) {
            
$obj->initialize();
        }
    }

    
/**
     * Helper method to show an object as string.
     *
     * @param object $obj
     *
     * @return string
     */
    
private static function objToStr($obj)
    {
        return 
method_exists($obj'__toString') ? (string)$obj get_class($obj).'@'.spl_object_hash($obj);
    }

    
/**
     * Marks an entity as read-only so that it will not be considered for updates during UnitOfWork#commit().
     *
     * This operation cannot be undone as some parts of the UnitOfWork now keep gathering information
     * on this object that might be necessary to perform a correct update.
     *
     * @param object $object
     *
     * @return void
     *
     * @throws ORMInvalidArgumentException
     */
    
public function markReadOnly($object)
    {
        if ( ! 
is_object($object) || ! $this->isInIdentityMap($object)) {
            throw 
ORMInvalidArgumentException::readOnlyRequiresManagedEntity($object);
        }

        
$this->readOnlyObjects[spl_object_hash($object)] = true;
    }

    
/**
     * Is this entity read only?
     *
     * @param object $object
     *
     * @return bool
     *
     * @throws ORMInvalidArgumentException
     */
    
public function isReadOnly($object)
    {
        if ( ! 
is_object($object)) {
            throw 
ORMInvalidArgumentException::readOnlyRequiresManagedEntity($object);
        }

        return isset(
$this->readOnlyObjects[spl_object_hash($object)]);
    }

    private function 
dispatchOnFlushEvent()
    {
        if (
$this->evm->hasListeners(Events::onFlush)) {
            
$this->evm->dispatchEvent(Events::onFlush, new OnFlushEventArgs($this->em));
        }
    }

    private function 
dispatchPostFlushEvent()
    {
        if (
$this->evm->hasListeners(Events::postFlush)) {
            
$this->evm->dispatchEvent(Events::postFlush, new PostFlushEventArgs($this->em));
        }
    }

    
/**
     * Verifies if two given entities actually are the same based on identifier comparison
     *
     * @param object $entity1
     * @param object $entity2
     *
     * @return bool
     */
    
private function isIdentifierEquals($entity1$entity2)
    {
        if (
$entity1 === $entity2) {
            return 
true;
        }

        
$class $this->em->getClassMetadata(get_class($entity1));

        if (
$class !== $this->em->getClassMetadata(get_class($entity2))) {
            return 
false;
        }

        
$oid1 spl_object_hash($entity1);
        
$oid2 spl_object_hash($entity2);

        
$id1 = isset($this->entityIdentifiers[$oid1])
            ? 
$this->entityIdentifiers[$oid1]
            : 
$this->flattenIdentifier($class$class->getIdentifierValues($entity1));
        
$id2 = isset($this->entityIdentifiers[$oid2])
            ? 
$this->entityIdentifiers[$oid2]
            : 
$this->flattenIdentifier($class$class->getIdentifierValues($entity2));

        return 
$id1 === $id2 || implode(' '$id1) === implode(' '$id2);
    }
}
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