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Java > Open Source Codes > org > jivesoftware > smack > filter > PacketTypeFilter


1 /**
2  * $RCSfile$
3  * $Revision: 2408 $
4  * $Date: 2004-11-02 20:53:30 -0300 (Tue, 02 Nov 2004) $
5  *
6  * Copyright 2003-2004 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
21 package org.jivesoftware.smack.filter;
22
23 import org.jivesoftware.smack.packet.Packet;
24
25 /**
26  * Filters for packets of a particular type. The type is given as a Class object, so
27  * example types would:
28  * <ul>
29  * <li><tt>Message.class</tt>
30  * <li><tt>IQ.class</tt>
31  * <li><tt>Presence.class</tt>
32  * </ul>
33  *
34  * @author Matt Tucker
35  */

36 public class PacketTypeFilter implements PacketFilter {
37
38     Class JavaDoc packetType;
39
40     /**
41      * Creates a new packet type filter that will filter for packets that are the
42      * same type as <tt>packetType</tt>.
43      *
44      * @param packetType the Class type.
45      */

46     public PacketTypeFilter(Class JavaDoc packetType) {
47         // Ensure the packet type is a sub-class of Packet.
48
if (!Packet.class.isAssignableFrom(packetType)) {
49             throw new IllegalArgumentException JavaDoc("Packet type must be a sub-class of Packet.");
50         }
51         this.packetType = packetType;
52     }
53
54     public boolean accept(Packet packet) {
55         return packetType.isInstance(packet);
56     }
57
58 }
59
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