viewquestionaction.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 org.apache.struts.Globals;
import org.apache.struts.action.*;
import org.apache.struts.util.MessageResources;

import com.cyberdemia.school.*;
import com.cyberdemia.cybertester.*;

import java.util.Locale;
import java.util.logging.*;

/**
 * 
 * ViewQuestionAction is a Struts action to load the data of a question
 * for the question review page.
 *  
 * @version $Revision: 1.2 $ at $Date: 2004/05/04 17:47:36 $ by $Author: alexycyap $
 * @author Alexander Yap
 */
public final class ViewQuestionAction extends AbstractUserAction
{
	protected ActionForward doPerform(
		ActionMapping mapping, ActionForm form,
		HttpServletRequest request, HttpServletResponse response,
		HttpSession session) throws Exception	
	{
		performGetQuestionView(request, response, session, getSessionLocale(session));
		return mapping.findForward(Constants.SUCCESS);
	}
	
	public static class FormattedChoice
	{
		FormattedChoice(boolean correct, String text)
		{
			m_correct = correct;
			m_text = text;
		}
	
		public boolean isCorrect()
		{
			return m_correct;
		}
	
		public void setCorrect(boolean correct)
		{
			m_correct = correct;
		}
	
		public String getText()
		{
			return m_text;
		}
	
		private String m_text;
		private boolean m_correct;
	}

	public static void performGetQuestionView(HttpServletRequest request, HttpServletResponse response,
			HttpSession session, Locale userLocale) throws Exception
	{
		Logger logger = CyberTesterUtils.getLogger();
		Integer quesId = CyberTesterUtils.getIntegerParameterOrRequestAttribute(request, Constants.QUESTION_ID_KEY);
		if (quesId==null)
		{
			// if not specified as parameter, check if it is already a session attribute 
            quesId = (Integer)session.getAttribute( Constants.QUESTION_ID_KEY );
		}
		
		if (quesId==null)	
			throw new ServletException("Missing parameter and session attribute "+Constants.QUESTION_ID_KEY);

        MessageResources resources = (MessageResources)request.getAttribute( Globals.MESSAGES_KEY );
		QuestionData ques = null;
		String typeStr = null;
		FormattedChoice[] formattedChoices = null;
		try
		{
			QuestionManagerHome qMgrHome = CyberTesterUtils.getQuestionManagerHome();
			QuestionManager quesMgr = (QuestionManager)qMgrHome.create();
			ques = quesMgr.getQuestionData(quesId);
			// Additional request attr to present more info to the JSP page
			if (ques.isSingleChoiceType())
			{
				typeStr = resources.getMessage(userLocale, "label.quesview.type.singleChoice");
				String[] answerChoices = ques.getAnswerChoices();
				formattedChoices = new FormattedChoice[answerChoices.length];
				int correctIdx = Integer.parseInt(ques.getAnswer());
				for (int a=0; a<answerChoices.length; a++)
				{
					formattedChoices[a] = new FormattedChoice( (a==correctIdx), answerChoices[a] );
				}
			}
			else if (ques.isMultipleChoiceType())
			{
				typeStr = resources.getMessage(userLocale, "label.quesview.type.multipleChoices");
				String[] answerChoices = ques.getAnswerChoices();
				formattedChoices = new FormattedChoice[answerChoices.length];
				for (int a=0; a<answerChoices.length; a++)
				{
					formattedChoices[a] = new FormattedChoice( false, answerChoices[a] );
				}
				String[] correctIndices = ques.getAnswer().split(",");
				for (int i=0; i<correctIndices.length; i++)
				{
					formattedChoices[ Integer.parseInt(correctIndices[i]) ].setCorrect( true );
				}
			}
			else if (ques.isKeywordsType())
			{
				typeStr = resources.getMessage(userLocale, "label.quesview.type.keywords");
			}
		}
		catch (Exception ex)
		{
			logger.log( Level.SEVERE, "Error getting Question data", ex);
			throw ex;
		}

		request.setAttribute(Constants.QUESTION_DATA_KEY, ques );
		request.setAttribute("typeStr", typeStr);
		request.setAttribute("formattedChoices", formattedChoices);
	}
	
}