vendor/doctrine/orm/lib/Doctrine/ORM/Query/TreeWalkerChain.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 Doctrine\ORM\Query;

/**
 * Represents a chain of tree walkers that modify an AST and finally emit output.
 * Only the last walker in the chain can emit output. Any previous walkers can modify
 * the AST to influence the final output produced by the last walker.
 *
 * @author Roman Borschel <roman@code-factory.org>
 * @since 2.0
 */
class TreeWalkerChain implements TreeWalker
{
    /**
     * The tree walkers.
     *
     * @var TreeWalker[]
     */
    private $_walkers = array();

    /**
     * The original Query.
     *
     * @var \Doctrine\ORM\AbstractQuery
     */
    private $_query;

    /**
     * The ParserResult of the original query that was produced by the Parser.
     *
     * @var \Doctrine\ORM\Query\ParserResult
     */
    private $_parserResult;

    /**
     * The query components of the original query (the "symbol table") that was produced by the Parser.
     *
     * @var array
     */
    private $_queryComponents;

    /**