vendor/doctrine/dbal/lib/Doctrine/DBAL/Schema/ForeignKeyConstraint.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\DBAL\Schema;

use Doctrine\DBAL\Platforms\AbstractPlatform;

/**
 * An abstraction class for a foreign key constraint.
 *
 * @author Benjamin Eberlei <kontakt@beberlei.de>
 * @author Steve Müller <st.mueller@dzh-online.de>
 * @link   www.doctrine-project.org
 * @since  2.0
 */
class ForeignKeyConstraint extends AbstractAsset implements Constraint
{
    /**
     * Instance of the referencing table the foreign key constraint is associated with.
     *
     * @var \Doctrine\DBAL\Schema\Table
     */
    protected $_localTable;

    /**
     * Asset identifier instances of the referencing table column names the foreign key constraint is associated with.
     * array($columnName => Identifier)
     *
     * @var Identifier[]
     */
    protected $_localColumnNames;

    /**
     * Table or asset identifier instance of the referenced table name the foreign key constraint is associated with.
     *
     * @var Table|Identifier
     */
    protected $_foreignTableName;

    /**
     * Asset identifier instances of the referenced table column names the foreign key constraint is associated with.
     * array($columnName => Identifier)
     *
     * @var Identifier[]