<?php

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

namespace TYPO3\CMS\Extbase\Persistence\Generic;

use TYPO3\CMS\Extbase\Persistence\ObjectStorage;
use TYPO3\CMS\Extbase\Persistence\PersistenceManagerInterface;
use TYPO3\CMS\Extbase\Persistence\QueryInterface;

/**
 * A persistence backend interface
 */
interface BackendInterface
{
    /**
     * Set a PersistenceManager instance.
     */
    public function setPersistenceManager(PersistenceManagerInterface $persistenceManager);

    /**
     * Sets the aggregate root objects
     */
    public function setAggregateRootObjects(ObjectStorage $objects);

    /**
     * Sets the deleted entities
     */
    public function setDeletedEntities(ObjectStorage $entities);

    /**
     * Sets the changed objects
     */
    public function setChangedEntities(ObjectStorage $entities);

    /**
     * Commits the current persistence session
     */
    public function commit();

    // @todo refactor towards being closer to the Flow backend interface again

    /**
     * Returns the (internal) identifier for the object, if it is known to the
     * backend. Otherwise NULL is returned.
     *
     * @param object $object
     * @return string|null The identifier for the object if it is known, or NULL
     */
    public function getIdentifierByObject($object);

    /**
     * Returns the object with the (internal) identifier, if it is known to the
     * backend. Otherwise NULL is returned.
     *
     * @param string $identifier
     * @param string $className
     * @return object|null The object for the identifier if it is known, or NULL
     */
    public function getObjectByIdentifier($identifier, $className);

    /**
     * Checks if the given object has ever been persisted.
     *
     * @param object $object The object to check
     * @return bool TRUE if the object is new, FALSE if the object exists in the repository
     */
    public function isNewObject($object);

    /**
     * Returns the number of records matching the query.
     *
     * @return int
     */
    public function getObjectCountByQuery(QueryInterface $query);

    /**
     * Returns the object data matching the $query.
     *
     * @return array
     */
    public function getObjectDataByQuery(QueryInterface $query);
}
