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   /*
    * Copyright 2013 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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.netty.handler.codec.memcache.binary;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.Unpooled;
  import io.netty.util.internal.UnstableApi;
  
  /**
   * The decoder part which takes care of decoding the request-specific headers.
   */
  @UnstableApi
  public class BinaryMemcacheRequestDecoder
      extends AbstractBinaryMemcacheDecoder<BinaryMemcacheRequest> {
  
      public BinaryMemcacheRequestDecoder() {
          this(DEFAULT_MAX_CHUNK_SIZE);
      }
  
      public BinaryMemcacheRequestDecoder(int chunkSize) {
          super(chunkSize);
      }
  
      @Override
      protected BinaryMemcacheRequest decodeHeader(ByteBuf in) {
          DefaultBinaryMemcacheRequest header = new DefaultBinaryMemcacheRequest();
          header.setMagic(in.readByte());
          header.setOpcode(in.readByte());
          header.setKeyLength(in.readShort());
          header.setExtrasLength(in.readByte());
          header.setDataType(in.readByte());
          header.setReserved(in.readShort());
          header.setTotalBodyLength(in.readInt());
          header.setOpaque(in.readInt());
          header.setCas(in.readLong());
          return header;
      }
  
      @Override
      protected BinaryMemcacheRequest buildInvalidMessage() {
          return new DefaultBinaryMemcacheRequest(Unpooled.EMPTY_BUFFER, Unpooled.EMPTY_BUFFER);
      }
  }