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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.filter.codec.netty;
21  
22  import net.gleamynode.netty2.Message;
23  
24  import org.apache.mina.core.buffer.IoBuffer;
25  import org.apache.mina.core.session.IoSession;
26  import org.apache.mina.filter.codec.ProtocolEncoder;
27  import org.apache.mina.filter.codec.ProtocolEncoderException;
28  import org.apache.mina.filter.codec.ProtocolEncoderOutput;
29  
30  /**
31   * A MINA <tt>ProtocolEncoder</tt> that encodes Netty2 {@link Message}s
32   * into buffers.
33   *
34   * @author The Apache MINA Project (dev@mina.apache.org)
35   */
36  public class NettyEncoder implements ProtocolEncoder {
37      /**
38       * Creates a new instance.
39       */
40      public NettyEncoder() {
41      }
42  
43      public void encode(IoSession session, Object message,
44              ProtocolEncoderOutput out) throws Exception {
45          if (!(message instanceof Message)) {
46              throw new ProtocolEncoderException(
47                      "This encoder can decode only Netty Messages.");
48          }
49  
50          for (;;) {
51              IoBuffer buf = IoBuffer.allocate(8192);
52              Message m = (Message) message;
53              try {
54                  if (m.write(buf.buf())) {
55                      break;
56                  }
57              } finally {
58                  buf.flip();
59                  if (buf.hasRemaining()) {
60                      out.write(buf);
61                  }
62              }
63          }
64      }
65  
66      public void dispose(IoSession session) throws Exception {
67      }
68  }