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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/>.
/**
* Used while evaluating conditions in bulk.
*
* This object caches get_users_by_capability results in case they are needed
* by multiple conditions.
*
* @package core_availability
* @copyright 2014 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace core_availability;
defined('MOODLE_INTERNAL') || die();
/**
* Used while evaluating conditions in bulk.
*
* This object caches get_users_by_capability results in case they are needed
* by multiple conditions.
*
* @package core_availability
* @copyright 2014 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class capability_checker {
/** @var \context Course or module context */
protected $context;
/** @var array Associative array of capability => result */
protected $cache = array();
/**
* Constructs for given context.
*
* @param \context $context Context
*/
public function __construct(\context $context) {
$this->context = $context;
}
/**
* Gets users on course who have the specified capability. Returns an array
* of user objects which only contain the 'id' field. If the same capability
* has already been checked (e.g. by another condition) then a cached
* result will be used.
*
* More fields are not necessary because this code is only used to filter
* users from an existing list.
*
* @param string $capability Required capability
* @return array Associative array of user id => objects containing only id
*/
public function get_users_by_capability($capability) {
if (!array_key_exists($capability, $this->cache)) {
$this->cache[$capability] = get_users_by_capability(
$this->context, $capability, 'u.id');
}
return $this->cache[$capability];
}
}