Файл: src/vendor/doctrine/collections/lib/Doctrine/Common/Collections/Expr/ExpressionVisitor.php
Строк: 93
<?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 DoctrineCommonCollectionsExpr;
/**
* An Expression visitor walks a graph of expressions and turns them into a
* query for the underlying implementation.
*
* @author Benjamin Eberlei <kontakt@beberlei.de>
*/
abstract class ExpressionVisitor
{
/**
* Converts a comparison expression into the target query language output.
*
* @param Comparison $comparison
*
* @return mixed
*/
abstract public function walkComparison(Comparison $comparison);
/**
* Converts a value expression into the target query language part.
*
* @param Value $value
*
* @return mixed
*/
abstract public function walkValue(Value $value);
/**
* Converts a composite expression into the target query language output.
*
* @param CompositeExpression $expr
*
* @return mixed
*/
abstract public function walkCompositeExpression(CompositeExpression $expr);
/**
* Dispatches walking an expression to the appropriate handler.
*
* @param Expression $expr
*
* @return mixed
*
* @throws RuntimeException
*/
public function dispatch(Expression $expr)
{
switch (true) {
case ($expr instanceof Comparison):
return $this->walkComparison($expr);
case ($expr instanceof Value):
return $this->walkValue($expr);
case ($expr instanceof CompositeExpression):
return $this->walkCompositeExpression($expr);
default:
throw new RuntimeException("Unknown Expression " . get_class($expr));
}
}
}