content: /*
   * Copyright (C) 2013 Facebook, Inc.
   *
   * Licensed 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 io.airlift.drift.transport.netty.codec;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.channel.ChannelDuplexHandler;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.ChannelPromise;
  
  public class HeaderCodec
          extends ChannelDuplexHandler
  {
      @Override
      public void channelRead(ChannelHandlerContext context, Object message)
      {
          if (message instanceof ByteBuf) {
              ByteBuf request = (ByteBuf) message;
              if (request.isReadable()) {
                  context.fireChannelRead(HeaderTransport.decodeFrame(request));
                  return;
              }
          }
          context.fireChannelRead(message);
      }
  
      @Override
      public void write(ChannelHandlerContext context, Object message, ChannelPromise promise)
      {
          if (message instanceof ThriftFrame) {
              context.write(HeaderTransport.encodeFrame((ThriftFrame) message), promise);
          }
          else {
              context.write(message, promise);
          }
      }
  }
  