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Java > Open Source Codes > org > apache > mina > example > sumup > codec > ResultMessageDecoder


1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one
3  * or more contributor license agreements. See the NOTICE file
4  * distributed with this work for additional information
5  * regarding copyright ownership. The ASF licenses this file
6  * to you under the Apache License, Version 2.0 (the
7  * "License"); you may not use this file except in compliance
8  * with the License. You may obtain a copy of the License at
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing,
13  * software distributed under the License is distributed on an
14  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15  * KIND, either express or implied. See the License for the
16  * specific language governing permissions and limitations
17  * under the License.
18  *
19  */
20 package org.apache.mina.example.sumup.codec;
21
22 import org.apache.mina.common.ByteBuffer;
23 import org.apache.mina.common.IoSession;
24 import org.apache.mina.example.sumup.message.AbstractMessage;
25 import org.apache.mina.example.sumup.message.ResultMessage;
26 import org.apache.mina.filter.codec.ProtocolDecoderOutput;
27 import org.apache.mina.filter.codec.demux.MessageDecoder;
28
29 /**
30  * A {@link MessageDecoder} that decodes {@link ResultMessage}.
31  *
32  * @author The Apache Directory Project (mina-dev@directory.apache.org)
33  * @version $Rev: 555855 $, $Date: 2007-07-13 12:19:00 +0900 (금, 13 7월 2007) $
34  */
35 public class ResultMessageDecoder extends AbstractMessageDecoder {
36     private int code;
37
38     private boolean readCode;
39
40     public ResultMessageDecoder() {
41         super(Constants.RESULT);
42     }
43
44     protected AbstractMessage decodeBody(IoSession session, ByteBuffer in) {
45         if (!readCode) {
46             if (in.remaining() < Constants.RESULT_CODE_LEN) {
47                 return null; // Need more data.
48 }
49
50             code = in.getShort();
51             readCode = true;
52         }
53
54         if (code == Constants.RESULT_OK) {
55             if (in.remaining() < Constants.RESULT_VALUE_LEN) {
56                 return null;
57             }
58
59             ResultMessage m = new ResultMessage();
60             m.setOk(true);
61             m.setValue(in.getInt());
62             readCode = false;
63             return m;
64         } else {
65             ResultMessage m = new ResultMessage();
66             m.setOk(false);
67             readCode = false;
68             return m;
69         }
70     }
71
72     public void finishDecode(IoSession session, ProtocolDecoderOutput out)
73             throws Exception JavaDoc {
74     }
75 }
76
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