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. /** * 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]; } }