<?php

/**
 * This program 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; under version 2
 * of the License (non-upgradable).
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright (c) 2014 (original work) Open Assessment Technologies SA (under the project TAO-PRODUCT);
 *
 */

namespace oat\taoQtiItem\model;

use oat\oatbox\AbstractRegistry;
use \common_exception_Error;
use \common_ext_ExtensionsManager;

/**
 *
 * @author Lionel Lecaque <lionel@taotesting.com>
 */
abstract class AbstractInteractionRegistry extends AbstractRegistry
{

    /**
     *
     * @author Lionel Lecaque, lionel@taotesting.com
     */
    abstract protected function getInteractionClass();


    /**
     * Register a new custom interaction
     *
     * @param string $qtiClass
     * @param string $phpClass
     * @throws common_exception_Error
     */
    public function set($qtiClass, $phpClass)
    {
        if (! class_exists($phpClass)) {
            throw new common_exception_Error('Custom interaction class ' . $phpClass . ' not found');
        }
        if (! is_subclass_of($phpClass, $this->getInteractionClass())) {
            throw new common_exception_Error('Class ' . $phpClass . ' not a subclass of ' . $this->getInteractionClass());
        }
        parent::set($qtiClass, $phpClass);
    }


    /**
     *
     * @author Lionel Lecaque, lionel@taotesting.com
     * @return \common_ext_Extension
     */
    protected function getExtension()
    {
        return common_ext_ExtensionsManager::singleton()->getExtensionById('taoQtiItem');
    }
}