class.ilObjStudyProgrammeCache.php

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<?php
 
declare(strict_types=1);
 
class ilObjStudyProgrammeCache
{
    private static ?ilObjStudyProgrammeCache $instance = null;
 
    protected array $instances;
 
    private function __construct()
    {
        $this->instances = array();
    }
 
    public static function singleton(): ilObjStudyProgrammeCache
    {
        if (self::$instance === null) {
            self::$instance = new ilObjStudyProgrammeCache();
        }
        return self::$instance;
    }
 
    public function getInstanceByRefId(int $ref_id): ilObjStudyProgramme
    {
        // TODO: Maybe this should be done via obj_id instead of ref_id, since two
        // ref_ids could point to the same object, hence leading to two instances of
        // the same object. Since ilObjStudyProgramme is a container, it should (??)
        // only have one ref_id...
        if (!array_key_exists($ref_id, $this->instances)) {
            $type = ilObject::_lookupType($ref_id, true);
            if ($type === 'prg') {
                $this->instances[$ref_id] = new ilObjStudyProgramme($ref_id);
            }
            if ($type === 'prgr') {
                $prg_reference = new ilObjStudyProgrammeReference($ref_id, true);
                $this->instances[$ref_id] = $prg_reference->getReferencedObject();
            }
            if ($type !== 'prgr' && $type !== 'prg') {
                throw new \Exception('invalid ref_id: ' . $ref_id);
            }
        }
        return $this->instances[$ref_id];
    }
 
    public function addInstance(ilObjStudyProgramme $prg): void
    {
        if (!$prg->getRefId()) {
            throw new ilException("ilObjStudyProgrammeCache::addInstance: Can't add instance without ref_id.");
        }
        $this->instances[$prg->getRefId()] = $prg;
    }
 
    public function test_clear(): void
    {
        $this->instances = array();
    }
 
    public function test_isEmpty(): bool
    {
        return count($this->instances) === 0;
    }
}