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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.http;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.Unpooled;
  import io.netty.handler.codec.DecoderResult;
  
  
  final class ComposedLastHttpContent implements LastHttpContent {
      private final HttpHeaders trailingHeaders;
      private DecoderResult result;
  
      ComposedLastHttpContent(HttpHeaders trailingHeaders) {
          this.trailingHeaders = trailingHeaders;
      }
  
      ComposedLastHttpContent(HttpHeaders trailingHeaders, DecoderResult result) {
          this(trailingHeaders);
          this.result = result;
      }
  
      @Override
      public HttpHeaders trailingHeaders() {
          return trailingHeaders;
      }
  
      @Override
      public LastHttpContent copy() {
          LastHttpContent content = new DefaultLastHttpContent(Unpooled.EMPTY_BUFFER);
          content.trailingHeaders().set(trailingHeaders());
          return content;
      }
  
      @Override
      public LastHttpContent duplicate() {
          return copy();
      }
  
      @Override
      public LastHttpContent retainedDuplicate() {
          return copy();
      }
  
      @Override
      public LastHttpContent replace(ByteBuf content) {
          final LastHttpContent dup = new DefaultLastHttpContent(content);
          dup.trailingHeaders().setAll(trailingHeaders());
          return dup;
      }
  
      @Override
      public LastHttpContent retain(int increment) {
          return this;
      }
  
      @Override
      public LastHttpContent retain() {
          return this;
      }
  
      @Override
      public LastHttpContent touch() {
          return this;
      }
  
      @Override
      public LastHttpContent touch(Object hint) {
          return this;
      }
  
      @Override
      public ByteBuf content() {
          return Unpooled.EMPTY_BUFFER;
      }
  
      @Override
      public DecoderResult decoderResult() {
          return result;
      }
  
      @Override
      public DecoderResult getDecoderResult() {
          return decoderResult();
      }
  
     @Override
     public void setDecoderResult(DecoderResult result) {
         this.result = result;
     }
 
     @Override
     public int refCnt() {
         return 1;
     }
 
     @Override
     public boolean release() {
         return false;
     }
 
     @Override
     public boolean release(int decrement) {
         return false;
     }
 }