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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.filter.codec.ProtocolEncoderOutput;
23  import org.apache.mina.filter.codec.ProtocolEncoderAdapter;
24  import org.apache.mina.core.buffer.IoBuffer;
25  import org.apache.mina.core.session.IoSession;
26  import org.apache.mina.example.imagine.step1.ImageResponse;
27  
28  import javax.imageio.ImageIO;
29  import java.awt.image.BufferedImage;
30  import java.io.ByteArrayOutputStream;
31  import java.io.IOException;
32  
33  /**
34   * an encoder for {@link ImageResponse} objects 
35   *
36   * @author The Apache MINA Project (dev@mina.apache.org)
37   */
38  public class ImageResponseEncoder extends ProtocolEncoderAdapter {
39  
40      public void encode(IoSession session, Object message, ProtocolEncoderOutput out) throws Exception {
41          ImageResponse imageResponse = (ImageResponse) message;
42          byte[] bytes1 = getBytes(imageResponse.getImage1());
43          byte[] bytes2 = getBytes(imageResponse.getImage2());
44          int capacity = bytes1.length + bytes2.length + 8;
45          IoBuffer buffer = IoBuffer.allocate(capacity, false);
46          buffer.putInt(bytes1.length);
47          buffer.put(bytes1);
48          buffer.putInt(bytes2.length);
49          buffer.put(bytes2);
50          buffer.flip();
51          out.write(buffer);
52      }
53  
54      private byte[] getBytes(BufferedImage image) throws IOException {
55          ByteArrayOutputStream baos = new ByteArrayOutputStream();
56          ImageIO.write(image, "PNG", baos);
57          return baos.toByteArray();
58      }
59  }