01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one
03: * or more contributor license agreements. See the NOTICE file
04: * distributed with this work for additional information
05: * regarding copyright ownership. The ASF licenses this file
06: * to you under the Apache License, Version 2.0 (the
07: * "License"); you may not use this file except in compliance
08: * with the License. You may obtain a copy of the License at
09: *
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.IoBuffer;
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 MINA Project (dev@mina.apache.org)
33: * @version $Rev: 581234 $, $Date: 2007-10-02 07:39:48 -0600 (Tue, 02 Oct 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: @Override
45: protected AbstractMessage decodeBody(IoSession session, IoBuffer in) {
46: if (!readCode) {
47: if (in.remaining() < Constants.RESULT_CODE_LEN) {
48: return null; // Need more data.
49: }
50:
51: code = in.getShort();
52: readCode = true;
53: }
54:
55: if (code == Constants.RESULT_OK) {
56: if (in.remaining() < Constants.RESULT_VALUE_LEN) {
57: return null;
58: }
59:
60: ResultMessage m = new ResultMessage();
61: m.setOk(true);
62: m.setValue(in.getInt());
63: readCode = false;
64: return m;
65: } else {
66: ResultMessage m = new ResultMessage();
67: m.setOk(false);
68: readCode = false;
69: return m;
70: }
71: }
72:
73: public void finishDecode(IoSession session,
74: ProtocolDecoderOutput out) throws Exception {
75: }
76: }
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