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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/>.

/**
 * This file contains the polyfill to allow a plugin to operate with Moodle 3.3 up.
 *
 * @package core_privacy
 * @copyright 2018 Andrew Nicols <andrew@nicols.co.uk>
 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
namespace core_privacy\local;

use \core_privacy\local\metadata\collection;
use \core_privacy\local\request\contextlist;
use \core_privacy\local\request\approved_contextlist;

defined('MOODLE_INTERNAL') || die();

/**
 * The trait used to provide a backwards compatability for third-party plugins.
 *
 * @copyright 2018 Andrew Nicols <andrew@nicols.co.uk>
 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
trait legacy_polyfill {

/**
     * Get the language string identifier with the component's language
     * file to explain why this plugin stores no data.
     *
     * @return  string
     */
    public static function get_reason() : string {
        return static::_get_reason();
    }

/**
     * Get the list of items.
     *
     * @param   collection     $collection The initialised collection to add items to.
     * @return  collection     A listing of user data stored through this system.
     */
    public static function get_metadata(collection $collection) : collection  {
        return static::_get_metadata($collection);
    }

/**
     * Export all user preferences for the plugin.
     *
     * @param   int         $userid The userid of the user whose data is to be exported.
     */
    public static function export_user_preferences(int $userid) {
        return static::_export_user_preferences($userid);
    }

/**
     * Get the list of contexts that contain user information for the specified user.
     *
     * @param   int         $userid     The user to search.
     * @return  contextlist   $contextlist  The contextlist containing the list of contexts used in this plugin.
     */
    public static function get_contexts_for_userid(int $userid) : contextlist {
        return static::_get_contexts_for_userid($userid);
    }

/**
     * Export all user data for the specified user, in the specified contexts.
     *
     * @param   approved_contextlist    $contextlist    The approved contexts to export information for.
     */
    public static function export_user_data(approved_contextlist $contextlist) {
        return static::_export_user_data($contextlist);
    }

/**
     * Delete all data for all users in the specified context.
     *
     * @param   context         $context   The specific context to delete data for.
     */
    public static function delete_data_for_all_users_in_context(\context $context) {
        return static::_delete_data_for_all_users_in_context($context);
    }

/**
     * Delete all user data for the specified user, in the specified contexts.
     *
     * @param   approved_contextlist    $contextlist    The approved contexts and user information to delete information for.
     */
    public static function delete_data_for_user(approved_contextlist $contextlist) {
        return static::_delete_data_for_user($contextlist);
    }
}