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.core.buffer.IoBuffer;
23 import org.apache.mina.core.session.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 MINA Project (dev@mina.apache.org)
33 */
34 public class ResultMessageDecoder extends AbstractMessageDecoder {
35 private int code;
36
37 private boolean readCode;
38
39 public ResultMessageDecoder() {
40 super(Constants.RESULT);
41 }
42
43 @Override
44 protected AbstractMessage decodeBody(IoSession session, IoBuffer 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 {
74 }
75 }