bsbrowsebean.java

一款即时通讯软件

package edu.ou.kmi.buddyspace.plugins.browse.core;

/*
 * BSBrowseBean.java
 *
 * Project: BuddySpace
 * (C) Copyright Knowledge Media Institute 2002
 *
 *
 * Created on 18 November 2002, 16:15
 */

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

/**
 * <code>BSBrowseBean</code> provides browsing.
 * It relies on <code>BrowseBean</code>, which is initialized using given
 * <code>ConnectionBean</code> (this must be reset after reconnection).
 *
 * @author  Jiri Komzak, Knowledge Media Institute, Open University, United Kingdom
 */
public class BSBrowseBean implements BrowseListener {
    //protected Hashtable curPresences;
    protected BrowseBean browseBean = null;
    protected final String name = "Browse";

    /**
     * Constructor
     */
    public BSBrowseBean() {
        browseBean = new BrowseBean();
        browseBean.addBrowseListener(this);
    }

    /**
     * Constructor, which sets existing and connected <code>ConnectionBean</code>.
     * Then this is registered as listener for packet events.
     */
    public BSBrowseBean(ConnectionBean connection) {
        this();
        setConnection(connection);
    }

    /**
     * Sets existing and connected <code>ConnectionBean</code>.
     * Then this is registered as listener for packet and connection events.
     */
    public void setConnection(ConnectionBean connection) {
        /*if (this.connection != null) {
            this.connection.delPacketListener(this);
            this.connection.delConnectionListener(this);
        }*/
        if (connection != null)
            browseBean.setConnBean(connection);
        else {
            //cmd4: to fix bug in BrowseBean not accepting null ConnectionBean
            browseBean.setConnBean(new ConnectionBean());
        }
        /*if (connection != null) {
            connection.addPacketListener(this);
            connection.addConnectionListener(this);
        }*/
    }

    /**
     * Returns currently used <code>ConnectionBean</code>.
     */
    public ConnectionBean getConnection() {
        return (browseBean != null)? browseBean.getConnBean() : null;
    }

    /** Called when disconnected */
    public void disconnected() {
    }

    /** Browses the given jid */
    public void browseTo(String jidStr, PacketID id, boolean refresh) {
        if (browseBean == null) return;
        browseBean.browseTo(jidStr, id, refresh);
    }

    /**
     * Clears the cache.
     */
    public void clear() {

    }

    /**
     * Frees all object bindings to allow object destroy
     */
    protected void prepareToDestroy() {
        //removeAllBrowseListeners();
        if (browseBean != null) {
            browseBean.delBrowseListener(this);
            browseBean = null;
        }
    }

    // *** LISTENER METHODS ***

    /**
     * Invoked when an error occures.
     */
    public void error(InfoQuery iq, String id) {
        //firePresenceChanged(new BSPresenceInfo(p));
    }

    /**
     * Invoked when a packet received.
     */
    public void received(BrowseItem b, java.lang.String id) {
    }


    // *** browse listeners ***

    /**
     * Adds <code>BSPresenceListener</code> to listeners notified when
     * presence state of some of buddies changes.
     *
     * @see #removePresenceListener
     * @see #removeAllPresenceListeners
     * @see #firePresenceChanged
     * @see #fireSubscriptionRequested
     * @see #fireSubscriptionApproved
     */
    public void addBrowseListener(BrowseListener listener) {
        if (browseBean == null) return;
        browseBean.addBrowseListener(listener);
    }

    /**
     * Removes <code>BSBrowseListener</code> to listeners notified when
     * presence state of some of buddies changes.
     *
     * @see #addPresenceListener
     * @see #removeAllPresenceListeners
     * @see #firePresenceChanged
     * @see #fireSubscriptionRequested
     * @see #fireSubscriptionApproved
     */
    public void removeBrowseListener(BrowseListener listener) {
        if (browseBean == null) return;
        browseBean.delBrowseListener(listener);
    }

    /**
     * Removes all listeners notified when presence state of some of buddies changes.
     * This can be used before to free dependencies and allow dispose of
     * all objects.
     *
     * @see #addPresenceListener
     * @see #removePresenceListener
     * @see #firePresenceChanged
     * @see #fireSubscriptionRequested
     * @see #fireSubscriptionApproved
     */
    /*public void removeAllPresenceListeners() {
        presenceListeners.clear();
    }*/

    /**
     * Notifies presence listeners about presence state of some of buddies change.
     *
     * @see #addPresenceListener
     * @see #removePresenceListener
     * @see #removeAllPresenceListeners
     * @see #fireSubscriptionRequested
     * @see #fireSubscriptionApproved
     */
    /*private void fireReceived(BrowseItem b, String id) {
        for (Enumeration e = presenceListeners.elements(); e.hasMoreElements(); ) {
            BSBrowseListener listener = (BSBrowseListener) e.nextElement();
            listener.fireReceived(b, id);
        }
    }*/


}