<?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\Visitor;

use Doctrine\DBAL\Platforms\AbstractPlatform;
use Doctrine\DBAL\Schema\Table;
use Doctrine\DBAL\Schema\Schema;
use Doctrine\DBAL\Schema\ForeignKeyConstraint;
use Doctrine\DBAL\Schema\Sequence;

/**
 * Removes assets from a schema that are not in the default namespace.
 *
 * Some databases such as MySQL support cross databases joins, but don't
 * allow to call DDLs to a database from another connected database.
 * Before a schema is serialized into SQL this visitor can cleanup schemas with
 * non default namespaces.
 *
 * This visitor filters all these non-default namespaced tables and sequences
 * and removes them from the SChema instance.
 *
 * @author Benjamin Eberlei <kontakt@beberlei.de>
 * @since  2.2
 */
class RemoveNamespacedAssets extends AbstractVisitor
{
    /**
     * @var \Doctrine\DBAL\Schema\Schema
     */
    private $schema;

    /**
     * {@inheritdoc}
     */
    public function acceptSchema(Schema $schema)
    {
        $this->schema = $schema;
    }

    /**
     * {@inheritdoc}
     */
    public function acceptTable(Table $table)
    {
        if ( ! $table->isInDefaultNamespace($this->schema->getName()) ) {
            $this->schema->dropTable($table->getName());
        }
    }

    /**
     * {@inheritdoc}
     */
    public function acceptSequence(Sequence $sequence)
    {
        if ( ! $sequence->isInDefaultNamespace($this->schema->getName()) ) {
            $this->schema->dropSequence($sequence->getName());
        }
    }

    /**
     * {@inheritdoc}
     */
    public function acceptForeignKey(Table $localTable, ForeignKeyConstraint $fkConstraint)
    {
        // The table may already be deleted in a previous
        // RemoveNamespacedAssets#acceptTable call. Removing Foreign keys that
        // point to nowhere.
        if ( ! $this->schema->hasTable($fkConstraint->getForeignTableName())) {
            $localTable->removeForeignKey($fkConstraint->getName());
            return;
        }

        $foreignTable = $this->schema->getTable($fkConstraint->getForeignTableName());
        if ( ! $foreignTable->isInDefaultNamespace($this->schema->getName()) ) {
            $localTable->removeForeignKey($fkConstraint->getName());
        }
    }
}
