pubsubitem.java

来自「一款即时通讯软件」· Java 代码 · 共 86 行

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

/*
 * PubsubItem.java
 *
 * Project: BuddySpace
 * (C) Copyright Knowledge Media Institute 2003
 *
 *
 * Created on 8 October 2003, 16:20
 */

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

/**
 * <code>PubsubItem</code> contains &lt;item&gt or &lt;retract&gt tag from pubsub.
 *
 * @author  Jiri Komzak, Knowledge Media Institute, Open University, United Kingdom
 */
public class PubsubItem
    extends XMLData
{
    /** Is this retract or item */
    private boolean isItem;
    /** Item id */
    private String id;
    /** Item XML */
    private XMLData xml;
    
    /**
     * Creates a new <code>PubsubItem</code> instance, based on the builder
     * state.
     *
     * @param builder an <code>PubsubItemBuilder</code> value
     * @exception InstantiationException if malformed or insufficient data is
     * in the builder.
     */
    public PubsubItem(PubsubItemBuilder builder)
        throws InstantiationException
    {
        isItem = builder.isItem();
        id = builder.getId();
        xml = builder.getXML();
    }
    
    
    public boolean isItem() {
        return isItem;
    }
    
    
    public String getId() {
        return id;
    }
    
    public XMLData getXML() {
        return xml;
    }
    
    
    /**
     * <code>appendItem</code> appends the XML representation of the
     * current packet data to the specified <code>StringBuffer</code>.
     *
     * @param retval The <code>StringBuffer</code> to append to
     */
    public void appendItem(StringBuffer retval)
    {
	retval.append(isItem? "<item" : "<retract");
        
        if (id != null)
            retval.append(" id='" + id + "'");
        
        if (xml != null){
            retval.append(">");
            xml.appendItem(retval);
            retval.append(isItem? "</item>" : "</retract>");
        }
        else
            retval.append("/>");
    }
}