vendor/doctrine/collections/lib/Doctrine/Common/Collections/Expr/Comparison.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\Common\Collections\Expr;

/**
 * Comparison of a field with a value by the given operator.
 *
 * @author Benjamin Eberlei <kontakt@beberlei.de>
 * @since  2.3
 */
class Comparison implements Expression
{
    const EQ         = '=';
    const NEQ        = '<>';
    const LT         = '<';
    const LTE        = '<=';
    const GT         = '>';
    const GTE        = '>=';
    const IS         = '='; // no difference with EQ
    const IN         = 'IN';
    const NIN        = 'NIN';
    const CONTAINS   = 'CONTAINS';
    const MEMBER_OF  = 'MEMBER_OF';
    const STARTS_WITH  = 'STARTS_WITH';
    const ENDS_WITH    = 'ENDS_WITH';    
    /**
     * @var string
     */
    private $field;

    /**
     * @var string
     */
    private $op;

    /**
     * @var Value
     */
    private $value;

    /**
     * @param string $field
     * @param string $operator