viewfactory.java

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//
// This file is part of the OpenNMS(R) Application.
//
// OpenNMS(R) is Copyright (C) 2002-2003 The OpenNMS Group, Inc.  All rights reserved.
// OpenNMS(R) is a derivative work, containing both original code, included code and modified
// code that was published under the GNU General Public License. Copyrights for modified 
// and included code are below.
//
// OpenNMS(R) is a registered trademark of The OpenNMS Group, Inc.
//
// Modifications:
//
// 2003 Jan 31: Cleaned up some unused imports.
//
// Original code base Copyright (C) 1999-2001 Oculan Corp.  All rights reserved.
//
// 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; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//       
// For more information contact: 
//      OpenNMS Licensing       <[e-mail]>
//      http://www.opennms.org/
//      http://www.opennms.com/
//
// Tab Size = 8
//

package org.opennms.netmgt.config;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringWriter;
import java.util.Collection;
import java.util.Date;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import org.apache.regexp.RE;
import org.apache.regexp.RESyntaxException;
import org.exolab.castor.xml.MarshalException;
import org.exolab.castor.xml.Marshaller;
import org.exolab.castor.xml.Unmarshaller;
import org.exolab.castor.xml.ValidationException;
import org.opennms.netmgt.ConfigFileConstants;
import org.opennms.netmgt.EventConstants;
import org.opennms.netmgt.config.views.Categories;
import org.opennms.netmgt.config.views.Header;
import org.opennms.netmgt.config.views.Member;
import org.opennms.netmgt.config.views.Membership;
import org.opennms.netmgt.config.views.View;
import org.opennms.netmgt.config.views.Viewinfo;
import org.opennms.netmgt.config.views.Views;

public class ViewFactory {
    /**
     * The static singleton instance of the ViewFactory
     */
    private static ViewFactory instance;

    /**
     * File path of views.xml
     */
    protected static File usersFile;

    /**
     * An input stream for the views configuration file
     */
    protected static InputStream configIn;

    /**
     * A mapping of views ids to the View objects
     */
    protected static HashMap m_views;

    /**
     * Boolean indicating if the init() method has been called
     */
    private static boolean initialized = false;

    private static Header oldHeader;

    /**
     * Initializes the factory
     */
    ViewFactory() {
    }

    public static synchronized void init() throws IOException, MarshalException, ValidationException {
        if (!initialized) {
            reload();
        }
    }

    /**
     * Singleton static call to get the only instance that should exist for the
     * ViewFactory
     * 
     * @return the single view factory instance
     */
    static synchronized public ViewFactory getInstance() {
        if (!initialized)
            return null;

        if (instance == null) {
            instance = new ViewFactory();
        }

        return instance;
    }

    /**
     * Parses the views.xml via the Castor classes
     */
    public static synchronized void reload() throws IOException, MarshalException, ValidationException {
        configIn = new FileInputStream(ConfigFileConstants.getFile(ConfigFileConstants.VIEWS_CONF_FILE_NAME));
        Viewinfo viewinfo = (Viewinfo) Unmarshaller.unmarshal(Viewinfo.class, new InputStreamReader(configIn));
        Views views = viewinfo.getViews();
        oldHeader = viewinfo.getHeader();
        Collection viewsList = views.getViewCollection();
        m_views = new HashMap();

        Iterator i = viewsList.iterator();
        while (i.hasNext()) {
            View curView = (View) i.next();
            m_views.put(curView.getName(), curView);
        }

        initialized = true;
    }

    /**
     * Adds a new user and overwrites the "users.xml"
     */
    public synchronized void saveView(String name, View details) throws Exception {
        if (name == null || details == null) {
            throw new Exception("UserFactory:saveUser  null");
        } else {
            m_views.put(name, details);
        }

        // Saves into "views.xml" file
        Views views = new Views();
        Collection viewList = (Collection) m_views.values();
        views.setViewCollection(viewList);
        saveViews(views);
    }

    /**
     * Removes the user from the list of users. Then overwrites to the
     * "users.xml"
     */
    public synchronized void deleteUser(String name) throws Exception {
        // Check if the user exists
        if (name != null) {
            // Remove the user in the view.
            Set viewKeys = (Set) m_views.keySet();
            Map map = new HashMap();

            View view;
            Iterator iter = viewKeys.iterator();
            while (iter.hasNext()) {
                View newView = new View();
                view = (View) m_views.get((String) iter.next());
                newView = view;

                Membership membership = new Membership();
                Membership viewmembers = view.getMembership();
                if (viewmembers != null) {
                    Enumeration en = viewmembers.enumerateMember();
                    while (en.hasMoreElements()) {
                        Member member = (Member) en.nextElement();
                        if (member.getType().equals("user")) {
                            if (!member.getContent().equals(name)) {
                                membership.addMember(member);
                            }
                        } else
                            membership.addMember(member);
                    }
                }
                newView.setMembership(membership);
                map.put(newView.getName(), newView);
            }
            // Saves into "views.xml" file
            m_views.clear();
            Views views = new Views();
            views.setViewCollection((Collection) map.values());
            saveViews(views);
        } else {
            throw new Exception("ViewFactory:delete Invalid user name:" + name);
        }
    }

    /**
     * When this method is called users name is changed, so also is the username
     * belonging to the group and the view. Also overwrites the "users.xml" file
     */
    public synchronized void renameUser(String oldName, String newName) throws Exception {
        // Get the old data
        if (oldName == null || newName == null || oldName == "" || newName == "") {
            throw new Exception("Group Factory: Rename user.. no value ");
        } else {

            Collection coll = (Collection) m_views.values();
            Iterator iter = (Iterator) coll.iterator();