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.AddMessage;
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 AddMessage}.
31 *
32 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
33 */
34 public class AddMessageDecoder extends AbstractMessageDecoder {
35
36 public AddMessageDecoder() {
37 super(Constants.ADD);
38 }
39
40 @Override
41 protected AbstractMessage decodeBody(IoSession session, IoBuffer in) {
42 if (in.remaining() < Constants.ADD_BODY_LEN) {
43 return null;
44 }
45
46 AddMessage m = new AddMessage();
47 m.setValue(in.getInt());
48 return m;
49 }
50
51 public void finishDecode(IoSession session, ProtocolDecoderOutput out)
52 throws Exception {
53 }
54 }