class.ilTestSessionFactory.php

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<?php
/* Copyright (c) 1998-2013 ILIAS open source, Extended GPL, see docs/LICENSE */

class ilTestSessionFactory
{
        private $testSession = array();

        private $testOBJ = null;

        public function __construct(ilObjTest $testOBJ)
        {
                $this->testOBJ = $testOBJ;
        }

        public function reset()
        {
                $this->testSession = array();
        }

        public function getSession($activeId = null)
        {
                if($activeId === null || $this->testSession[$activeId] === null)
                {
                        $testSession = $this->getNewTestSessionObject();

                        $testSession->setRefId($this->testOBJ->getRefId());
                        $testSession->setTestId($this->testOBJ->getTestId());

                        if($activeId)
                        {
                                $testSession->loadFromDb($activeId);
                                $this->testSession[$activeId] = $testSession;
                        }
                        else
                        {
                                global $ilUser;

                                $testSession->loadTestSession(
                                        $this->testOBJ->getTestId(), $ilUser->getId(), $testSession->getAccessCodeFromSession()
                                );

                                return $testSession;
                        }
                }

                return $this->testSession[$activeId];
        }

        public function getSessionByUserId($userId)
        {
                if(!isset($this->testSession[$this->buildCacheKey($userId)]))
                {
                        $testSession = $this->getNewTestSessionObject();

                        $testSession->setRefId($this->testOBJ->getRefId());
                        $testSession->setTestId($this->testOBJ->getTestId());

                        $testSession->loadTestSession($this->testOBJ->getTestId(), $userId);

                        $this->testSession[$this->buildCacheKey($userId)] = $testSession;
                }

                return $this->testSession[$this->buildCacheKey($userId)];
        }

        private function getNewTestSessionObject()
        {
                switch($this->testOBJ->getQuestionSetType())
                {
                        case ilObjTest::QUESTION_SET_TYPE_FIXED:
                        case ilObjTest::QUESTION_SET_TYPE_RANDOM:

                                require_once 'Modules/Test/classes/class.ilTestSession.php';
                                $testSession = new ilTestSession();
                                break;

                        case ilObjTest::QUESTION_SET_TYPE_DYNAMIC:

                                require_once 'Modules/Test/classes/class.ilTestSessionDynamicQuestionSet.php';
                                $testSession = new ilTestSessionDynamicQuestionSet();
                                break;
                }

                return $testSession;
        }

        private function buildCacheKey($userId)
        {
                return "{$this->testOBJ->getTestId()}::{$userId}";
        }
}