001/** 002 * 003 * Copyright 2003-2007 Jive Software, 2024 Florian Schmaus. 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.ExtensionElement; 021import org.jivesoftware.smack.packet.Stanza; 022import org.jivesoftware.smack.util.Objects; 023 024/** 025 * Implements the logical NOT operation on a stanza filter. In other words, packets 026 * pass this filter if they do not pass the supplied filter. 027 * 028 * @author Matt Tucker 029 */ 030public class NotFilter implements StanzaFilter { 031 032 private final StanzaFilter filter; 033 034 /** 035 * Creates a NOT filter using the specified filter. 036 * 037 * @param filter the filter. 038 */ 039 public NotFilter(StanzaFilter filter) { 040 this.filter = Objects.requireNonNull(filter, "Parameter must not be null."); 041 } 042 043 @Override 044 public boolean accept(Stanza packet) { 045 return !filter.accept(packet); 046 } 047 048 public static <E extends ExtensionElement> NotFilter of(Class<E> extensionElementClass) { 049 ExtensionElementFilter<E> extensionElementFilter = new ExtensionElementFilter<>(extensionElementClass); 050 return new NotFilter(extensionElementFilter); 051 } 052}