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.Stanza; 021import org.jivesoftware.smack.util.Objects; 022 023/** 024 * Implements the logical NOT operation on a stanza(/packet) filter. In other words, packets 025 * pass this filter if they do not pass the supplied filter. 026 * 027 * @author Matt Tucker 028 */ 029public class NotFilter implements StanzaFilter { 030 031 private final StanzaFilter filter; 032 033 /** 034 * Creates a NOT filter using the specified filter. 035 * 036 * @param filter the filter. 037 */ 038 public NotFilter(StanzaFilter filter) { 039 this.filter = Objects.requireNonNull(filter, "Parameter must not be null."); 040 } 041 042 public boolean accept(Stanza packet) { 043 return !filter.accept(packet); 044 } 045}