maptag.java

一款即时通讯软件

/*
 *   License
 *
 * The contents of this file are subject to the Jabber Open Source License
 * Version 1.0 (the "License").  You may not copy or use this file, in either
 * source code or executable form, except in compliance with the License.  You
 * may obtain a copy of the License at http://www.jabber.com/license/ or at
 * http://www.opensource.org/.  
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 *   Copyrights
 *
 * Portions created by or assigned to Jabber.com, Inc. are 
 * Copyright (c) 2000 Jabber.com, Inc.  All Rights Reserved.  Contact
 * information for Jabber.com, Inc. is available at http://www.jabber.com/.
 *
 * Portions Copyright (c) 1999-2000 David Waite 
 *
 *   Acknowledgements
 * 
 * Special thanks to the Jabber Open Source Contributors for their
 * suggestions and support of Jabber.
 * 
 *   Changes
 *
 * @author  David Waite <a href="mailto:[e-mail]">
 *                      <i>&lt;[e-mail]&gt;</i></a>
 *
 * @author  $Author: chris $
 * @version $Revision: 1.1 $
 *
 * j.komzak
 * Changed into MapTag
 */

package edu.ou.kmi.buddyspace.plugins.maps.xml;

/*
 * MapTag.java
 *
 * Project: BuddySpace
 * (C) Copyright Knowledge Media Institute 2002
 *
 *
 * Created on 16 August 2002, 10:20
 */

import java.util.Vector;
import java.util.Enumeration;
import org.jabber.jabberbeans.*;
import org.jabber.jabberbeans.Extension.*;

/**
 * <code>MapTag</code> contains &lt;map&gt tag.
 *
 * @author  Jiri Komzak, Knowledge Media Institute, Open University, United Kingdom
 */
public class MapTag
    extends XMLData
    implements MessageExtension, QueryExtension
{
    /** Vector of 'Layer' objects contained */
    private Vector layers;
    
    private String id = null;

    /**
     * Creates a new <code>MapTag</code> instance, based on the builder
     * state.
     *
     * @param builder an <code>MapTagBuilder</code> value
     * @exception InstantiationException if malformed or insufficient data is
     * in the builder.
     */
    public MapTag(MapTagBuilder builder)
        throws InstantiationException
    {
        layers = (Vector) builder.getLayers().clone();
        id = builder.getID();
    }
    
    public String getID() {
        return id;
    }
    
    
    public void setID(String id) {
        this.id = id;
    }

    /**
     * returns an enumeration of <code>layers</code> contained within this
     * object.
     *
     * @return an <code>Enumeration</code> value
     */
    public Enumeration layers()
    {
        return layers.elements();
    }
    
    
    public void addLayer(LayerTag newLayer)
    {
        layers.add(newLayer);
    }
    
    
    public void deleteLayer(LayerTag layer)
    {
        layers.remove(layer);
    }


    /**
     * <code>appendItem</code> converts this packet to XML. 
     * It then appends it to a StringBuffer.
     *
     * @param retval The <code>StringBuffer</code> to append to
     */
    public void appendItem(StringBuffer retval)
    {
	retval.append("<map id=\"" + id
                        + "\" xmlns=\"http://jabber.open.ac.uk/tags/map\"");
        Enumeration items = layers();
        
        if (items==null)
        {
            retval.append("/>\n");
            return;
        }
        else
            retval.append(">\n");

        while (items.hasMoreElements())
            ((LayerTag)items.nextElement()).appendItem(retval);
        
        retval.append("</map>\n");
    }
}