vendor/doctrine/orm/lib/Doctrine/ORM/Persisters/SqlValueVisitor.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\Persisters;

use Doctrine\Common\Collections\Expr\ExpressionVisitor;
use Doctrine\Common\Collections\Expr\Comparison;
use Doctrine\Common\Collections\Expr\Value;
use Doctrine\Common\Collections\Expr\CompositeExpression;

/**
 * Extract the values from a criteria/expression
 *
 * @author Benjamin Eberlei <kontakt@beberlei.de>
 */
class SqlValueVisitor extends ExpressionVisitor
{
    /**
     * @var array
     */
    private $values = array();

    /**
     * @var array
     */
    private $types  = array();

    /**
     * Converts a comparison expression into the target query language output.
     *
     * @param \Doctrine\Common\Collections\Expr\Comparison $comparison
     *
     * @return mixed
     */
    public function walkComparison(Comparison $comparison)
    {
        $value          = $this->getValueFromComparison($comparison);
        $field          = $comparison->getField();
        $operator       = $comparison->getOperator();

        if (($operator === Comparison::EQ || $operator === Comparison::IS) && $value === null) {
            return;
        } else if ($operator === Comparison::NEQ && $value === null) {
            return;