?? bans.java
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/** Copyright (c) 2001 Sun Microsystems, Inc. All rights* reserved.** Redistribution and use in source and binary forms, with or without* modification, are permitted provided that the following conditions* are met:** 1. Redistributions of source code must retain the above copyright* notice, this list of conditions and the following disclaimer.** 2. Redistributions in binary form must reproduce the above copyright* notice, this list of conditions and the following disclaimer in* the documentation and/or other materials provided with the* distribution.** 3. The end-user documentation included with the redistribution,* if any, must include the following acknowledgment:* "This product includes software developed by the* Sun Microsystems, Inc. for Project JXTA."* Alternately, this acknowledgment may appear in the software itself,* if and wherever such third-party acknowledgments normally appear.** 4. The groups "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA"* must not be used to endorse or promote products derived from this* software without prior written permission. For written* permission, please contact Project JXTA at http://www.jxta.org.** 5. Products derived from this software may not be called "JXTA",* nor may "JXTA" appear in their group, without prior written* permission of Sun.** THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF* SUCH DAMAGE.* ====================================================================** This software consists of voluntary contributions made by many* individuals on behalf of Project JXTA. For more* information on Project JXTA, please see* <http://www.jxta.org/>.** This license is based on the BSD license adopted by the Apache Foundation.** $Id: Bans.java,v 1.3 2006/06/12 20:45:22 nano Exp $*/package net.jxta.myjxta.directive.util;import java.util.ArrayList;import java.util.Collections;import java.util.List;import net.jxta.myjxta.dialog.DialogMessage;/** * * @version $Id: Bans.java,v 1.3 2006/06/12 20:45:22 nano Exp $ * * @author james todd [gonzo at jxta dot org] */public class Bans { private static Bans instance = null; private List<String> bans = null; /** * Returns the handle to this singleton instance. */ public static synchronized Bans getInstance() { if (instance == null) { instance = new Bans(); } return instance; } /** * Returns the <code>List</code> of peer ids that have been banned in this session. */ public List getBans() { return this.bans != null ? this.bans : Collections.EMPTY_LIST; } /** * Returns true if the originator of the supplied DialogMessage is banned, and false otherwise. */ public boolean isBanned (DialogMessage msg) { if (msg == null) { return false; } return isBanned(msg.getOriginator()); } /** * Returns true if the supplied peer id is banned, and false otherwise. */ public boolean isBanned (String peer) { if (peer == null) { return false; } return getBans().contains(peer); } /** * Adds the supplied peer to the list of banned peers. */ public void addBan(String peer) { peer = peer != null ? peer.trim() : peer; if (peer != null) { if (this.bans == null) { this.bans = new ArrayList<String>(); } if (! this.bans.contains(peer)) { this.bans.add(peer); } } } /** * Adds the supplied peer <code>List</code> to the list of banned peers. * * @param bans A <code>List</code> of <code>Strings</code>. Each element in the list is a peer id. */ public void addBans(List<String> bans) { this.bans.addAll(bans); } /** * Removes the supplied peer from the list of banned peers. */ public void removeBan(String peer) { peer = peer != null ? peer.trim() : null; if (peer != null && this.bans != null) { this.bans.remove(peer); if (this.bans.size() == 0) { this.bans = null; } } } /** * Removes the supplied peer <code>List</code> from the list of banned peers. * * @param bans A <code>List</code> of <code>Strings</code>. Each element in the list is a peer id. */ public void removeBans(List bans) { this.bans.removeAll(bans); } /** * Removes all peers <code>List</code> from the list of banned peers. */ public synchronized void clearBans() { if (this.bans != null) { this.bans.clear(); this.bans = null; } } /** * Limits the instantiation of this class. */ protected Bans() { super(); }}
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