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 * Filters for packets with a particular type of packet extension. 024 * 025 * @author Matt Tucker 026 */ 027public class PacketExtensionFilter implements PacketFilter { 028 029 private String elementName; 030 private String namespace; 031 032 /** 033 * Creates a new packet extension filter. Packets will pass the filter if 034 * they have a packet extension that matches the specified element name 035 * and namespace. 036 * 037 * @param elementName the XML element name of the packet extension. 038 * @param namespace the XML namespace of the packet extension. 039 */ 040 public PacketExtensionFilter(String elementName, String namespace) { 041 this.elementName = elementName; 042 this.namespace = namespace; 043 } 044 045 /** 046 * Creates a new packet extension filter. Packets will pass the filter if they have a packet 047 * extension that matches the specified namespace. 048 * 049 * @param namespace the XML namespace of the packet extension. 050 */ 051 public PacketExtensionFilter(String namespace) { 052 this(null, namespace); 053 } 054 055 public boolean accept(Packet packet) { 056 return packet.getExtension(elementName, namespace) != null; 057 } 058}