savequestionaction.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.admin.test;

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

/**
 * 
 * SaveQuestionAction is a Struts action to save the values received from 
 * the question editor to either a new or existing question. 
 *  
 * @author Alexander Yap
 */
public final class SaveQuestionAction extends AbstractAdminAction 
{
	protected ActionForward doPerform(
		ActionMapping mapping, ActionForm form,
		HttpServletRequest request, HttpServletResponse response,
		HttpSession session) throws Exception	
	{
		String testId = CyberTesterUtils.getParameterOrRequestAttribute(request,AdminConstants.TEST_ID_KEY);
		if (testId!=null)
		{
			request.setAttribute(AdminConstants.TEST_ID_KEY, testId);
		}

		// Was this transaction cancelled?
		if (isCancelled(request)) 
		{
			cleanup( mapping, session );
			return mapping.findForward(Constants.SUCCESS);
		}

		Logger logger = CyberTesterUtils.getLogger();

		ActionErrors errors = new ActionErrors();
		// If submitted out of order, go to error page immediately.
		if (!isTokenValid(request))
		{
			errors.add(ActionErrors.GLOBAL_ERROR, new ActionError("error.transaction.token"));
		}

		resetToken(request);
			
		if (errors.isEmpty())
		{
			QuestionForm quesForm = (QuestionForm)form;
			try
			{
				QuestionManagerHome qMgrHome = CyberTesterUtils.getQuestionManagerHome();
				QuestionManager quesMgr = (QuestionManager)qMgrHome.create();
				if (quesForm.isNew())
				{
					quesMgr.addQuestion( getQuestionDataFromForm(quesForm) );
				}
				else
				{
					QuestionData data = getQuestionDataFromForm(quesForm);
					quesMgr.setQuestionData(data.id, data);
				}
			}
			catch (Exception ex)
			{
				logger.log( Level.SEVERE, "Error saving Question", ex);
				throw ex;
			}
		}
					
		cleanup( mapping, session );

		if (!errors.isEmpty())
		{
			saveErrors(request, errors);
			saveToken(request);
			return (new ActionForward(mapping.getInput()));
		}
		return mapping.findForward(Constants.SUCCESS);
	}

	private void cleanup( ActionMapping mapping, HttpSession session)
	{
		if (mapping.getAttribute() != null)
			session.removeAttribute(mapping.getAttribute());
		session.removeAttribute(AdminConstants.MODE_KEY);
	}
	
	private static QuestionData getQuestionDataFromForm(QuestionForm quesForm)
	{
		QuestionData data = new QuestionData();
		data.id = quesForm.getQuesId();
		data.name = quesForm.getTitle();
		data.difficulty = DifficultyEnum.getEnumFromString(quesForm.getDifficultyStr());
		data.question = quesForm.getQuestionText();
		data.hint = quesForm.getHintText();
		data.explanation = quesForm.getExplanationText();
		data.answer = new Integer(quesForm.getAnswer());
		data.answerChoices = quesForm.getAnswerChoices();
        data.timeLimitSeconds = quesForm.getTimeLimitSeconds();
		return data;
	}
	
}