inittestaction.java

老外的在线考试

/*
 * CyberTester - J2EE Web application for creating, delivering and managing tests/exams/surveys. 
 * Copyright (C) 2004 CyberDemia Research and Services Pty Ltd
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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 (see the file COPYING); if not, write to the
 * Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * See the COPYING file located in the top-level-directory of
 * the archive of this program for complete text of license.
 */
package com.cyberdemia.cybertester.testee.test;

import javax.servlet.*;
import javax.servlet.http.*;
import java.util.logging.*;
import org.apache.struts.action.*;
import com.cyberdemia.cybertester.*;
import com.cyberdemia.cybertester.testee.*;
import com.cyberdemia.school.*;
import com.cyberdemia.cybertester.AbstractUserAction;

/**
 * 
 * InitTestAction is a Struts action to initialize a test.
 * It determines whether the multiQuestionsMode is enabled and then
 * forwards to the appropriate page/action.
 *  
 * @version $Revision: 1.5 $ at $Date: 2004/06/26 17:14:52 $ by $Author: alexycyap $
 * @author Alexander Yap
 */
public class InitTestAction extends AbstractUserAction 
{

	protected ActionForward doPerform(
		ActionMapping mapping, ActionForm form,
		HttpServletRequest request, HttpServletResponse response,
		HttpSession session) throws Exception 
		{
			Logger logger = CyberTesterUtils.getLogger();
			Integer testId = CyberTesterUtils.getIntegerParameterOrRequestAttribute(request, TesteeConstants.TEST_ID_KEY);
			if (testId==null)
			{
				throw new ServletException("Missing parameter "+TesteeConstants.TEST_ID_KEY);
			}

			String forwardTarget = null;
			try
			{
				TestManagerHome tMgrHome = CyberTesterUtils.getTestManagerHome();
				TestManager testMgr = (TestManager)tMgrHome.create();
				QuestionManagerHome qMgrHome = CyberTesterUtils.getQuestionManagerHome();
				QuestionManager quesMgr = (QuestionManager)qMgrHome.create();
				QuestionData[] quesList = quesMgr.getQuestionsByTest(testId);
				TestData testData = testMgr.getTestData(testId);
				session.setAttribute( TesteeConstants.QUESTION_LIST_KEY, quesList);
				session.setAttribute( TesteeConstants.QUESTION_COUNT_KEY, new Integer(quesList.length));
				session.setAttribute( TesteeConstants.TEST_ID_KEY, testId);
				session.setAttribute( TesteeConstants.TEST_DATA_KEY, testData);
				
				if (testData.isMultiQuestionsMode())
				{
					TesteeTestUtils.storeTestTimeToken(session, testId);
					session.setAttribute(TesteeConstants.QUESTION_LIST_OFFSET_KEY, new Integer(0));
					request.setAttribute(TesteeConstants.QUESTION_LIST_BLOCK_END_INDEX_KEY, new Integer(Math.min( TesteeConstants.QUESTION_LIST_BLOCK_SIZE, quesList.length )-1));
					// Set a transactional control token to prevent double posting
					saveToken(request);
					forwardTarget = "multiQuestions";
				}
				else
				{
					session.setAttribute( TesteeConstants.QUESTION_INDEX_KEY, new Integer(0));
					forwardTarget = "singleQuestion";
				}

			}
			catch (Exception ex)
			{
				logger.log( Level.SEVERE, "Error getting questions for test "+testId, ex);
				throw ex;
			}

			return mapping.findForward(forwardTarget);
	}

}