1/**
2 * $RCSfile$
3 * $Revision$
4 * $Date$
5 *
6 * Copyright 2003-2007 Jive Software.
7 *
8 * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
9 * you may not use this file except in compliance with the License.
10 * You may obtain a copy of the License at
11 *
12 *     http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS,
16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
19 */
20
21package org.jivesoftware.smack.filter;
22
23import org.jivesoftware.smack.packet.Packet;
24
25/**
26 * Filters for packets with a particular type of packet extension.
27 *
28 * @author Matt Tucker
29 */
30public class PacketExtensionFilter implements PacketFilter {
31
32    private String elementName;
33    private String namespace;
34
35    /**
36     * Creates a new packet extension filter. Packets will pass the filter if
37     * they have a packet extension that matches the specified element name
38     * and namespace.
39     *
40     * @param elementName the XML element name of the packet extension.
41     * @param namespace the XML namespace of the packet extension.
42     */
43    public PacketExtensionFilter(String elementName, String namespace) {
44        this.elementName = elementName;
45        this.namespace = namespace;
46    }
47
48    /**
49     * Creates a new packet extension filter. Packets will pass the filter if they have a packet
50     * extension that matches the specified namespace.
51     *
52     * @param namespace the XML namespace of the packet extension.
53     */
54    public PacketExtensionFilter(String namespace) {
55        this(null, namespace);
56    }
57
58    public boolean accept(Packet packet) {
59        return packet.getExtension(elementName, namespace) != null;
60    }
61}
62