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}