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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.imagine.step1.codec;
21  
22  import org.apache.mina.core.buffer.IoBuffer;
23  import org.apache.mina.core.session.IoSession;
24  import org.apache.mina.example.imagine.step1.ImageRequest;
25  import org.apache.mina.filter.codec.CumulativeProtocolDecoder;
26  import org.apache.mina.filter.codec.ProtocolDecoderOutput;
27  
28  /**
29   * a decoder for {@link ImageRequest} objects
30   *
31   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
32   */
33  
34  public class ImageRequestDecoder extends CumulativeProtocolDecoder {
35      
36      protected boolean doDecode(IoSession session, IoBuffer in, ProtocolDecoderOutput out) throws Exception {
37          if (in.remaining() >= 12) {
38              int width = in.getInt();
39              int height = in.getInt();
40              int numberOfCharachters = in.getInt();
41              ImageRequest request = new ImageRequest(width, height, numberOfCharachters);
42              out.write(request);
43              return true;
44          } else {
45              return false;
46          }
47      }
48  }