Source of file ExpressionVisitor.php
Size: 2,598 Bytes - Last Modified: 2012-09-20T07:55:18+02:00
/home/theseer/Downloads/Symfony/vendor/doctrine/common/lib/Doctrine/Common/Collections/Expr/ExpressionVisitor.php
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182 | <?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 Doctrine\Common\Collections\Expr; /** * 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 { /** * Convert a comparison expression into the target query language output * * @param Comparison $comparison * * @return mixed */ abstract public function walkComparison(Comparison $comparison); /** * Convert a value expression into the target query language part. * * @param Value $value * * @return mixed */ abstract public function walkValue(Value $value); /** * Convert a composite expression into the target query language output * * @param CompositeExpression $expr * * @return mixed */ abstract public function walkCompositeExpression(CompositeExpression $expr); /** * Dispatch walking an expression to the appropriate handler. * * @param Expression * * @return mixed */ 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)); } } } |