content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.camel.example.netty;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.handler.codec.MessageToByteEncoder;
  
  /**
   * Netty encoder that writes the Camel message to bytes with start and end byte markers.
   */
  public class MyCodecEncoder extends MessageToByteEncoder<Object> {
  
      private static char startByte = 0x0b; // 11 decimal
      private static char endByte1 = 0x1c; // 28 decimal
      private static char endByte2 = 0x0d; // 13 decimal
  
      @Override
      protected void encode(ChannelHandlerContext channelHandlerContext, Object message, ByteBuf byteBuf) throws Exception {
  
          byte[] body;
          if (message instanceof String) {
              body = ((String) message).getBytes();
          } else if (message instanceof byte[]) {
              body = (byte[]) message;
          } else {
              throw new IllegalArgumentException("The message to encode is not a supported type: "
                  + message.getClass().getCanonicalName());
          }
  
          byteBuf.writeByte(startByte);
          byteBuf.writeBytes(body);
          byteBuf.writeByte(endByte1);
          byteBuf.writeByte(endByte2);
      }
  }
  