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


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  * Implements the logical NOT operation on a packet filter. In other words, packets
27  * pass this filter if they do not pass the supplied filter.
28  *
29  * @author Matt Tucker
30  */
31 public class NotFilter implements PacketFilter {
32
33     private PacketFilter filter;
34
35     /**
36      * Creates a NOT filter using the specified filter.
37      *
38      * @param filter the filter.
39      */
40     public NotFilter(PacketFilter filter) {
41         if (filter == null) {
42             throw new IllegalArgumentException JavaDoc("Parameter cannot be null.");
43         }
44         this.filter = filter;
45     }
46
47     public boolean accept(Packet packet) {
48         return !filter.accept(packet);
49     }
50 }
51
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