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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;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.Unpooled;
  import io.netty.handler.codec.DecoderResult;
  import io.netty.util.internal.UnstableApi;
  
  /**
   * The {@link MemcacheContent} which signals the end of the content batch.
   * <p/>
   * Note that by design, even when no content is emitted by the protocol, an
   * empty {@link LastMemcacheContent} is issued to make the upstream parsing
   * easier.
   */
  @UnstableApi
  public interface LastMemcacheContent extends MemcacheContent {
  
      LastMemcacheContent EMPTY_LAST_CONTENT = new LastMemcacheContent() {
  
          @Override
          public LastMemcacheContent copy() {
              return EMPTY_LAST_CONTENT;
          }
  
          @Override
          public LastMemcacheContent duplicate() {
              return this;
          }
  
          @Override
          public LastMemcacheContent retainedDuplicate() {
              return this;
          }
  
          @Override
          public LastMemcacheContent replace(ByteBuf content) {
              return new DefaultLastMemcacheContent(content);
          }
  
          @Override
          public LastMemcacheContent retain(int increment) {
              return this;
          }
  
          @Override
          public LastMemcacheContent retain() {
              return this;
          }
  
          @Override
          public LastMemcacheContent touch() {
              return this;
          }
  
          @Override
          public LastMemcacheContent touch(Object hint) {
              return this;
          }
  
          @Override
          public ByteBuf content() {
              return Unpooled.EMPTY_BUFFER;
          }
  
          @Override
          public DecoderResult decoderResult() {
              return DecoderResult.SUCCESS;
          }
  
          @Override
          public void setDecoderResult(DecoderResult result) {
              throw new UnsupportedOperationException("read only");
          }
  
          @Override
          public int refCnt() {
              return 1;
          }
  
          @Override
          public boolean release() {
              return false;
          }
  
         @Override
         public boolean release(int decrement) {
             return false;
         }
     };
 
     @Override
     LastMemcacheContent copy();
 
     @Override
     LastMemcacheContent duplicate();
 
     @Override
     LastMemcacheContent retainedDuplicate();
 
     @Override
     LastMemcacheContent replace(ByteBuf content);
 
     @Override
     LastMemcacheContent retain(int increment);
 
     @Override
     LastMemcacheContent retain();
 
     @Override
     LastMemcacheContent touch();
 
     @Override
     LastMemcacheContent touch(Object hint);
 }