<?php
/**
 * @copyright Copyright (c) 2016, ownCloud, Inc.
 *
 * @author Jörn Friedrich Dreyer <jfd@butonic.de>
 * @author Morris Jobke <hey@morrisjobke.de>
 * @author Roeland Jago Douma <roeland@famdouma.nl>
 *
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */
namespace OCP\Files\ObjectStore;

use OCP\Files\NotFoundException;

/**
 * Interface IObjectStore
 *
 * @package OCP\Files\ObjectStore
 * @since 7.0.0
 */
interface IObjectStore {

	/**
	 * @return string the container or bucket name where objects are stored
	 * @since 7.0.0
	 */
	public function getStorageId();

	/**
	 * @param string $urn the unified resource name used to identify the object
	 * @return resource stream with the read data
	 * @throws \Exception when something goes wrong, message will be logged
	 * @throws NotFoundException if file does not exist
	 * @since 7.0.0
	 */
	public function readObject($urn);

	/**
	 * @param string $urn the unified resource name used to identify the object
	 * @param resource $stream stream with the data to write
	 * @throws \Exception when something goes wrong, message will be logged
	 * @since 7.0.0
	 */
	public function writeObject($urn, $stream);

	/**
	 * @param string $urn the unified resource name used to identify the object
	 * @return void
	 * @throws \Exception when something goes wrong, message will be logged
	 * @since 7.0.0
	 */
	public function deleteObject($urn);

	/**
	 * Check if an object exists in the object store
	 *
	 * @param string $urn
	 * @return bool
	 * @since 16.0.0
	 */
	public function objectExists($urn);
}
