class.ilObjStudyProgrammeCache.php

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<?php

/* Copyright (c) 2015 Richard Klees <richard.klees@concepts-and-training.de> Extended GPL, see docs/LICENSE */

class ilObjStudyProgrammeCache {
        static private  $instance = null; // ilObjStudyProgrammeCache

        private function __construct() {
                $this->instances = array();
        }

        static public function singleton() {
                if (self::$instance === null) {
                        self::$instance = new ilObjStudyProgrammeCache();
                }
                return self::$instance;
        }
        
        protected $instances; // [ilObjStudyProgramme]
        
        public function getInstanceByRefId($a_ref_id) {
                require_once("Modules/StudyProgramme/classes/class.ilObjStudyProgramme.php");   
                
                // TODO: Maybe this should be done via obj_id instead of ref_id, since two
                // ref_ids could point to the same object, hence leading to two instances of
                // the same object. Since ilObjStudyProgramme is a container, it should (??)
                // only have one ref_id...
                if (!array_key_exists($a_ref_id, $this->instances)) {
                        $this->instances[$a_ref_id] = new ilObjStudyProgramme($a_ref_id);
                }
                return $this->instances[$a_ref_id];
        }
        
        public function addInstance(ilObjStudyProgramme $a_prg) {
                if (!$a_prg->getRefId()) {
                        throw new ilException("ilObjStudyProgrammeCache::addInstance: "
                                                                 ."Can't add instance without ref_id.");
                }
                $this->instances[$a_prg->getRefId()] = $a_prg;
        }
        
        public function test_clear() {
                $this->instances = array();
        }
        
        public function test_isEmpty() {
                return count($this->instances) == 0;
        }
}

?>