C:/xampp/htdocs/moodle/backup/util/plan/backup_step.class.php

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<?php

// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

abstract class backup_step extends base_step {

    public function __construct($name, $task = null) {
        if (!is_null($task) && !($task instanceof backup_task)) {
            throw new backup_step_exception('wrong_backup_task_specified');
        }
        parent::__construct($name, $task);
    }

    protected function get_backupid() {
        if (is_null($this->task)) {
            throw new backup_step_exception('not_specified_backup_task');
        }
        return $this->task->get_backupid();
    }
}

/*
 * Exception class used by all the @backup_step stuff
 */
class backup_step_exception extends base_step_exception {

    public function __construct($errorcode, $a=NULL, $debuginfo=null) {
        parent::__construct($errorcode, $a, $debuginfo);
    }
}