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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/>.
/**
* std_proxy class.
*
* @package core_calendar
* @copyright 2017 Cameron Ball <cameron@cameron1729.xyz>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace core_calendar\local\event\proxies;
defined('MOODLE_INTERNAL') || die();
use core_calendar\local\event\exceptions\member_does_not_exist_exception;
/**
* stdClass proxy.
*
* This class is intended to proxy things like user, group, etc 'classes'
* It will only run the callback to load the object from the DB when necessary.
*
* @copyright 2017 Cameron Ball <cameron@cameron1729.xyz>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class std_proxy implements proxy_interface {
/**
* @var int $id The ID of the database record.
*/
protected $id;
/**
* @var \stdClass $class The class we are proxying.
*/
protected $class;
/**
* @var callable $callback Callback to run which will load the class to proxy.
*/
protected $callback;
/**
* @var array $callbackargs Array of arguments to pass to the callback.
*/
protected $callbackargs;
/**
* @var \stdClass $base Base class to get members from.
*/
protected $base;
/**
* Constructor.
*
* @param int $id The ID of the record in the database.
* @param callable $callback Callback to load the class.
* @param \stdClass $base Class containing base values.
*/
public function __construct($id, callable $callback, \stdClass $base = null) {
$this->id = $id;
$this->callbackargs = [$id];
$this->callback = $callback;
$this->base = $base;
}
public function get($member) {
if ($member === 'id') {
return $this->id;
}
if ($this->base && property_exists($this->base, $member)) {
return $this->base->{$member};
}
if (!property_exists($this->get_proxied_instance(), $member)) {
throw new member_does_not_exist_exception(sprintf('Member %s does not exist', $member));
}
return $this->get_proxied_instance()->{$member};
}
public function get_proxied_instance() {
$callback = $this->callback;
return $this->class = $this->class ? $this->class : $callback(...$this->callbackargs);
}
}