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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.common.ByteBuffer;
    25  import org.apache.mina.common.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 byte buffers.
    33   *
    34   * @author The Apache Directory Project (mina-dev@directory.apache.org)
    35   * @version $Rev: 555855 $, $Date: 2007-07-13 05:19:00 +0200 (Fri, 13 Jul 2007) $,
    36   */
    37  public class NettyEncoder implements ProtocolEncoder {
    38      /**
    39       * Creates a new instance.
    40       */
    41      public NettyEncoder() {
    42      }
    43
    44      public void encode(IoSession session, Object message,
    45              ProtocolEncoderOutput out) throws Exception {
    46          if (!(message instanceof Message)) {
    47              throw new ProtocolEncoderException(
    48                      "This encoder can decode only Netty Messages.");
    49          }
    50
    51          for (;;) {
    52              ByteBuffer buf = ByteBuffer.allocate(8192);
    53              Message m = (Message) message;
    54              try {
    55                  if (m.write(buf.buf())) {
    56                      break;
    57                  }
    58              } finally {
    59                  buf.flip();
    60                  if (buf.hasRemaining()) {
    61                      out.write(buf);
    62                  } else {
    63                      buf.release();
    64                  }
    65              }
    66          }
    67      }
    68
    69      public void dispose(IoSession session) throws Exception {
    70      }
    71  }