source: trunk/jabberit_messenger/java_source/src/nu/fw/jeti/jabber/elements/IQXRoster.java @ 1001

package nu.fw.jeti.jabber.elements;

import java.util.Iterator;
import java.util.LinkedList;
import java.util.NoSuchElementException;

import nu.fw.jeti.events.CompleteRosterListener;
import nu.fw.jeti.jabber.Backend;



/**
 * <p>Title: im</p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2001</p>
 * <p>Company: </p>
 * @author E.S. de Boer
 * @version 1.0
 */

public class IQXRoster extends Extension implements IQExtension, XExtension
{//iq + x roster
        private LinkedList items;

        public IQXRoster(){}//extension tag for get

        public IQXRoster(RosterItem item)
        {
                items = new LinkedList();
                items.add(item);
        }

    public IQXRoster(RosterBuilder rb)
    {
                items=rb.getItems();
    }

        public Iterator getItems()
        {
                if (items==null)
                {
                        return new Iterator()
                        {//empty iterator
                                public Object next()
                                {
                                        throw new NoSuchElementException();
                                }
                                public boolean hasNext()
                                {
                                        return false;
                                }
                                public void remove()
                                {
                                        throw new UnsupportedOperationException();
                                }
                        };
                }
                return items.iterator();
        }
        
        public void execute(InfoQuery iq,Backend backend)
        {
                for (Iterator j = backend.getListeners(CompleteRosterListener.class); j.hasNext();)
                {
                        ((CompleteRosterListener) j.next()).rosterReceived(iq,this);
                }
        }


        public void appendToXML(StringBuffer xml)
    {/** @todo x */
        xml.append("<query xmlns=\"jabber:iq:roster\"");
                if(items ==null)
                { //short cut
                    xml.append("/>");
                        return;
                }
                xml.append('>');
                for(Iterator i = items.iterator();i.hasNext();)
                {
                    ((RosterItem)i.next()).appendToXML(xml);
                }
                xml.append("</query>");
    }
}


/*
 * Overrides for emacs
 * Local variables:
 * tab-width: 4
 * End:
 */