001/** 002 * 003 * Copyright 2003-2007 Jive Software. 004 * 005 * Licensed under the Apache License, Version 2.0 (the "License"); 006 * you may not use this file except in compliance with the License. 007 * You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018package org.jivesoftware.smack.filter; 019 020import org.jivesoftware.smack.packet.Packet; 021 022/** 023 * Implements the logical NOT operation on a packet filter. In other words, packets 024 * pass this filter if they do not pass the supplied filter. 025 * 026 * @author Matt Tucker 027 */ 028public class NotFilter implements PacketFilter { 029 030 private PacketFilter filter; 031 032 /** 033 * Creates a NOT filter using the specified filter. 034 * 035 * @param filter the filter. 036 */ 037 public NotFilter(PacketFilter filter) { 038 if (filter == null) { 039 throw new IllegalArgumentException("Parameter must not be null."); 040 } 041 this.filter = filter; 042 } 043 044 public boolean accept(Packet packet) { 045 return !filter.accept(packet); 046 } 047}