getquestionsaction.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.*;

/**
 * 
 * GetQuestionsAction is a Struts action to load data of all questions' belonging to a test, or all unassigned questions.
 *  
 * @author Alexander Yap
 */
public final class GetQuestionsAction extends AbstractAdminAction 
{
	protected ActionForward doPerform(
		ActionMapping mapping, ActionForm form,
		HttpServletRequest request, HttpServletResponse response,
		HttpSession session) throws Exception
	{
		Logger logger = CyberTesterUtils.getLogger();
		// If test ID sent by the form is 0, treat it as null.
		Integer rawTestId = CyberTesterUtils.getIntegerParameterOrRequestAttribute(request, AdminConstants.TEST_ID_KEY);
		Integer testId = null;
		if ((rawTestId != null) && (rawTestId.intValue() > 0) )
		{
			testId = rawTestId;
		}

		ActionErrors errors = new ActionErrors();
		try
		{
			String ownerHierId = (String)session.getAttribute(AdminConstants.SELECTED_HIERARCHY_ID_KEY);
			TestData[] testList = null;
			if (ownerHierId!=null)
			{
				TestManagerHome tMgrHome = CyberTesterUtils.getTestManagerHome();
				TestManager testMgr = (TestManager)tMgrHome.create();
				testList = testMgr.getTests(ownerHierId, true);
				request.setAttribute( AdminConstants.TEST_LIST_KEY, testList );
				if (testId!=null)
				{
					logger.fine("Retrieving Questions assigned to Test ID "+testId);
					request.setAttribute(AdminConstants.TEST_ID_KEY, testId);
				}
				else
				{
					logger.fine("Retrieving unassigned Questions");
				}

				QuestionManagerHome qMgrHome = CyberTesterUtils.getQuestionManagerHome();
				QuestionManager quesMgr = (QuestionManager)qMgrHome.create();
				QuestionData[] quesList = quesMgr.getQuestionsByTest(testId);
				logger.fine("Number of Questions retrieved : "+quesList.length);
				request.setAttribute( AdminConstants.QUESTION_LIST_KEY, quesList );
			}
			else
			{
				errors.add(ActionErrors.GLOBAL_ERROR, new ActionError("error.hierarchyNode.unselected"));
			}
		}
		catch (Exception ex)
		{
			logger.log( Level.SEVERE, "Error getting questions", ex);
			throw ex;
		}

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

		return mapping.findForward(Constants.SUCCESS);
	}
	
}