editgroupaction.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.admin.user;

import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.struts.action.ActionError;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import com.cyberdemia.cybertester.Constants;
import com.cyberdemia.cybertester.CyberTesterUtils;
import com.cyberdemia.cybertester.admin.AbstractAdminAction;
import com.cyberdemia.cybertester.admin.AdminConstants;
import com.cyberdemia.user.GroupData;
import com.cyberdemia.user.GroupManager;
import com.cyberdemia.user.GroupManagerHome;
import com.cyberdemia.user.UserData;

/**
 * 
 * EditGroupAction  is a Struts action to load the group editor page,
 * search for a list of users to be assigned to the group and adds users to the group.
 *  
 * @version $Revision: 1.5 $ at $Date: 2004/06/17 15:46:22 $ by $Author: alexycyap $
 * @author Alexander Yap
 */
public final class EditGroupAction extends AbstractAdminAction 
{
	protected ActionForward doPerform(
		ActionMapping mapping, ActionForm form,
		HttpServletRequest request, HttpServletResponse response,
		HttpSession session) throws Exception	
	{
		Logger logger = CyberTesterUtils.getLogger();
		String mode = request.getParameter(AdminConstants.MODE_KEY);
		if (mode==null)
			mode = AdminConstants.EDITOR_NEW_MODE;


		if (form==null)
		{
			form = new GroupForm();
			session.setAttribute(mapping.getAttribute(), form);
		}
		GroupForm groupForm = (GroupForm)form;

		// mode may be one of the following:
		// new
		// edit
		// searchUsers
		// addUsers
		
		// For convenience, just check for new and treat edit, searchUsers and addUsers
		// mode collectively.
		
		// populate the form with data if editing existing test.
		if (AdminConstants.EDITOR_NEW_MODE.equalsIgnoreCase(mode))
		{
			String hierId = (String)session.getAttribute(AdminConstants.SELECTED_HIERARCHY_ID_KEY);
			if (hierId==null)
			{
				ActionErrors errors = new ActionErrors();
				errors.add(ActionErrors.GLOBAL_ERROR, new ActionError("error.hierarchyNode.unselected"));
				saveErrors(request, errors);
				return mapping.findForward(Constants.ERROR);
			}
			groupForm.reset(mapping,request);
			logger.fine("Adding new Group to hierarchy node "+hierId);
		}
		else
		{
            Integer groupId = CyberTesterUtils.getIntegerParameterOrRequestAttribute(request,AdminConstants.GROUP_ID_KEY);
			if (groupId==null)
			{
				throw new ServletException("Missing parameter "+AdminConstants.GROUP_ID_KEY);
			}

			String userSearchTarget = CyberTesterUtils.getParameterOrRequestAttribute(request, AdminConstants.SEARCH_TARGET_KEY);

			logger.fine("Editing Group "+groupId);
			Set searchResultsUserSet = new HashSet();
			try
			{
				GroupManagerHome gMgrHome = CyberTesterUtils.getGroupManagerHome();
				GroupManager groupMgr = (GroupManager)gMgrHome.create();
				
				if ("addUsers".equalsIgnoreCase(mode))
				{
					// If submitted out of order, do nothing.
					if (isTokenValid(request))
					{
						Enumeration pEnum = request.getParameterNames();
						List userIdToAddList = new ArrayList();
						while (pEnum.hasMoreElements())
						{
							String pName = (String)pEnum.nextElement();
							if (pName.startsWith(AdminConstants.ADD_USER_PARAM_PREFIX) )
							{
								if ( Boolean.valueOf(request.getParameter(pName)).booleanValue() )
								{
									Integer userId = CyberTesterUtils.convertToInteger(pName.substring(AdminConstants.ADD_USER_PARAM_PREFIX.length()));
	                                if (userId!=null)
	                                {
	                                	userIdToAddList.add(userId);
	                                }
								}
							}
						}
						groupMgr.assignUsersToGroup(userIdToAddList, groupId);
					}
				}
				
				
				GroupData groupData = groupMgr.getGroupData(groupId, true, false);
				groupForm.setId( groupId );
				groupForm.setMode(mode);
				groupForm.setName( groupData.getName() );
				UserData[] usersInGroup = groupData.getUsers();
				groupForm.setUsers( usersInGroup );
				
				if ((userSearchTarget!=null) && (userSearchTarget.trim().length()>0))
				{
					groupForm.setSearchTarget(userSearchTarget);
					logger.log( Level.FINE, "Searching users for target "+userSearchTarget);
					try
					{
						GetUsersAction.searchForUsers( userSearchTarget, searchResultsUserSet);
					}
					catch (Exception ex)
					{
						logger.log( Level.WARNING, "Error searching users.", ex);
					}
					// We must remove users currently assigned to this group from searchResultsUserSet
					// because these users should not be displayed as available for addition to this group.
					for (int u=0; u<usersInGroup.length; u++)
					{
						 searchResultsUserSet.remove( usersInGroup[u] );
					}
				}
				else
				{
					groupForm.setSearchTarget("");
				}
				
			}
			catch (Exception ex)
			{
				logger.log( Level.SEVERE, "Error transferring Group data to form.", ex);
				throw ex;
			}
			request.setAttribute( AdminConstants.USER_LIST_KEY, searchResultsUserSet );
			request.setAttribute(AdminConstants.ADD_USER_PARAM_PREFIX_KEY, AdminConstants.ADD_USER_PARAM_PREFIX);
		}

		request.setAttribute(AdminConstants.DISASSOC_PARAM_PREFIX_KEY, AdminConstants.DISASSOC_PARAM_PREFIX);
		// Set a transactional control token to prevent double posting
		saveToken(request);
		return (mapping.findForward(Constants.SUCCESS));
	}
}