3 // This file is part of Moodle - http://moodle.org/
5 // Moodle is free software: you can redistribute it and/or modify
6 // it under the terms of the GNU General Public License as published by
7 // the Free Software Foundation, either version 3 of the License, or
8 // (at your option) any later version.
10 // Moodle is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 // GNU General Public License for more details.
15 // You should have received a copy of the GNU General Public License
16 // along with Moodle. If not, see <http://www.gnu.org/licenses/>.
20 * @subpackage backup-interfaces
21 * @copyright 2010 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com}
22 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
26 * Interface to apply to all the classes we want to calculate their checksum
28 * Each class being part of @backup_controller will implement this interface
29 * in order to be able to calculate one objective and unique checksum for
30 * the whole controller class.
32 * TODO: Finish phpdocs
34 interface checksumable {
37 * This function will return one unique and stable checksum for one instance
38 * of the class implementing it. It's each implementation responsibility to
39 * do it recursively if needed and use optional store (caching) of the checksum if
42 public function calculate_checksum();
45 * Given one checksum, returns if matches object's checksum (true) or no (false)
47 public function is_checksum_correct($checksum);