checkmultianswersaction.java

老外的在线考试

/*
 * CyberTester - J2EE Web application for creating, delivering and managing tests/exams/surveys. 
 * Copyright (C) 2003 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.student.test;

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

/**
 * 
 * CheckMultiAnswersAction is a Struts action to receive and check the user's answers
 * to all the questions. It is called once for a test that has its
 * "multiQuestionsMode" enabled.
 *  
 * @author Alexander Yap
 */
public final class CheckMultiAnswersAction extends AbstractUserAction
{
	protected ActionForward doPerform(
		ActionMapping mapping, ActionForm form,
		HttpServletRequest request, HttpServletResponse response,
		HttpSession session) throws Exception
	{

		ActionErrors errors = new ActionErrors();
		QuestionData[] questions = (QuestionData[])session.getAttribute( StudentConstants.QUESTION_LIST_KEY);
		if ( questions==null )
		{
			errors.add(ActionErrors.GLOBAL_ERROR, new ActionError("error.transaction.token"));
		}
		
		// Was this transaction cancelled?
		if (isCancelled(request))
		{
			cleanup( session );
			return mapping.findForward(Constants.CANCELLED);
		}

		String testId = (String)session.getAttribute(StudentConstants.TEST_ID_KEY);
		String userId = (String)session.getAttribute(Constants.USER_ID_KEY);
		boolean testTimedOut = false;
		if (errors.isEmpty())
		{
			try
			{
								
				TestManagerHome testMgrHome = CyberTesterUtils.getTestManagerHome();
				TestManager testMgr = (TestManager)testMgrHome.create();
				if (!testMgr.getTestScoreForUser(testId, userId, false).isTestTaken())
				{
					int timeSecs = (int)(StudentTestUtils.checkTestTimeToken(session,testId)/1000);
					
					for (int q=0; q<questions.length; q++)
					{
						String answerStr = request.getParameter("answer"+q);
						if (answerStr!=null)
						{
							QuestionData quesData = questions[q];
							Integer userAnswer = new Integer(answerStr);							
							if (testMgr.checkQuestionAnswer(testId, quesData.getId(), userId, q, userAnswer, timeSecs,0)==IAnswerStatus.TEST_TIMED_OUT)
							{
								testTimedOut = true;							
							}
						}
						else
						{
							errors.add(ActionErrors.GLOBAL_ERROR, new ActionError("error.form.missingParam.select","Answer "+q));
						}
					}
				}
				else
				{
					CyberTesterUtils.getLogger().log( Level.WARNING, "User "+userId+" already taken test "+testId);
					errors.add(ActionErrors.GLOBAL_ERROR, new ActionError("error.test.taken"));
				}
			}
			catch (Exception ex)
			{
				CyberTesterUtils.getLogger().log( Level.SEVERE, "Error checking answers.", ex);
				errors.add(ActionErrors.GLOBAL_ERROR, new ActionError("error.checking.answers",ex.getMessage()));
			}

		}

		// End of the test, clean up the session
		cleanup(session);

		if (!errors.isEmpty())
		{
			saveErrors(request, errors);
			return mapping.findForward(Constants.ERROR);
		}

		request.setAttribute( StudentConstants.TEST_ID_KEY,testId);
		if (testTimedOut)
		{
			request.setAttribute(StudentConstants.TEST_TIMED_OUT_KEY, Boolean.TRUE);
		}
		return mapping.findForward(Constants.SUCCESS);
		
	}

	private void cleanup(HttpSession session)
	{
		session.removeAttribute(StudentConstants.TEST_ID_KEY);
		session.removeAttribute(StudentConstants.TEST_DATA_KEY);
		session.removeAttribute(StudentConstants.QUESTION_LIST_KEY);
		StudentTestUtils.removeTestTimeToken(session);
	}

}