vendor/doctrine/orm/lib/Doctrine/ORM/Query/TreeWalker.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;

/**
 * Interface for walkers of DQL ASTs (abstract syntax trees).
 *
 * @author Roman Borschel <roman@code-factory.org>
 * @since 2.0
 */
interface TreeWalker
{
    /**
     * Initializes TreeWalker with important information about the ASTs to be walked.
     *
     * @param \Doctrine\ORM\AbstractQuery      $query           The parsed Query.
     * @param \Doctrine\ORM\Query\ParserResult $parserResult    The result of the parsing process.
     * @param array                            $queryComponents The query components (symbol table).
     */
    public function __construct($query, $parserResult, array $queryComponents);

    /**
     * Returns internal queryComponents array.
     *
     * @return array
     */
    public function getQueryComponents();

    /**
     * Sets or overrides a query component for a given dql alias.
     *
     * @param string $dqlAlias       The DQL alias.
     * @param array  $queryComponent
     *
     * @return void
     */
    public function setQueryComponent($dqlAlias, array $queryComponent);

    /**
     * Walks down a SelectStatement AST node, thereby generating the appropriate SQL.
     *
     * @param AST\SelectStatement $AST
     *