/*
    * 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.ByteBufUtil;
  import io.netty.buffer.Unpooled;
  import io.netty.util.IllegalReferenceCountException;
  
  import static io.netty.util.internal.ObjectUtil.checkNotNull;
  
  /**
   * Default implementation of a {@link FullHttpResponse}.
   */
  public class DefaultFullHttpResponse extends DefaultHttpResponse implements FullHttpResponse {
  
      private final ByteBuf content;
      private final HttpHeaders trailingHeaders;
  
      /**
       * Used to cache the value of the hash code and avoid {@link IllegalReferenceCountException}.
       */
      private int hash;
  
      public DefaultFullHttpResponse(HttpVersion version, HttpResponseStatus status) {
          this(version, status, Unpooled.buffer(0));
      }
  
      public DefaultFullHttpResponse(HttpVersion version, HttpResponseStatus status, ByteBuf content) {
          this(version, status, content, true);
      }
  
      public DefaultFullHttpResponse(HttpVersion version, HttpResponseStatus status, boolean validateHeaders) {
          this(version, status, Unpooled.buffer(0), validateHeaders, false);
      }
  
      public DefaultFullHttpResponse(HttpVersion version, HttpResponseStatus status, boolean validateHeaders,
                                     boolean singleFieldHeaders) {
          this(version, status, Unpooled.buffer(0), validateHeaders, singleFieldHeaders);
      }
  
      public DefaultFullHttpResponse(HttpVersion version, HttpResponseStatus status,
                                     ByteBuf content, boolean validateHeaders) {
          this(version, status, content, validateHeaders, false);
      }
  
      public DefaultFullHttpResponse(HttpVersion version, HttpResponseStatus status,
                                     ByteBuf content, boolean validateHeaders, boolean singleFieldHeaders) {
          super(version, status, validateHeaders, singleFieldHeaders);
          this.content = checkNotNull(content, "content");
          this.trailingHeaders = singleFieldHeaders ? new CombinedHttpHeaders(validateHeaders)
                                                    : new DefaultHttpHeaders(validateHeaders);
      }
  
      public DefaultFullHttpResponse(HttpVersion version, HttpResponseStatus status,
              ByteBuf content, HttpHeaders headers, HttpHeaders trailingHeaders) {
          super(version, status, headers);
          this.content = checkNotNull(content, "content");
          this.trailingHeaders = checkNotNull(trailingHeaders, "trailingHeaders");
      }
  
      @Override
      public HttpHeaders trailingHeaders() {
          return trailingHeaders;
      }
  
      @Override
      public ByteBuf content() {
          return content;
      }
  
      @Override
      public int refCnt() {
          return content.refCnt();
      }
  
      @Override
      public FullHttpResponse retain() {
          content.retain();
          return this;
      }
  
      @Override
      public FullHttpResponse retain(int increment) {
          content.retain(increment);
          return this;
     }
 
     @Override
     public FullHttpResponse touch() {
         content.touch();
         return this;
     }
 
     @Override
     public FullHttpResponse touch(Object hint) {
         content.touch(hint);
         return this;
     }
 
     @Override
     public boolean release() {
         return content.release();
     }
 
     @Override
     public boolean release(int decrement) {
         return content.release(decrement);
     }
 
     @Override
     public FullHttpResponse setProtocolVersion(HttpVersion version) {
         super.setProtocolVersion(version);
         return this;
     }
 
     @Override
     public FullHttpResponse setStatus(HttpResponseStatus status) {
         super.setStatus(status);
         return this;
     }
 
     @Override
     public FullHttpResponse copy() {
         return replace(content().copy());
     }
 
     @Override
     public FullHttpResponse duplicate() {
         return replace(content().duplicate());
     }
 
     @Override
     public FullHttpResponse retainedDuplicate() {
         return replace(content().retainedDuplicate());
     }
 
     @Override
     public FullHttpResponse replace(ByteBuf content) {
         FullHttpResponse response = new DefaultFullHttpResponse(protocolVersion(), status(), content,
                 headers().copy(), trailingHeaders().copy());
         response.setDecoderResult(decoderResult());
         return response;
     }
 
     @Override
     public int hashCode() {
         int hash = this.hash;
         if (hash == 0) {
             if (ByteBufUtil.isAccessible(content())) {
                 try {
                     hash = 31 + content().hashCode();
                 } catch (IllegalReferenceCountException ignored) {
                     // Handle race condition between checking refCnt() == 0 and using the object.
                     hash = 31;
                 }
             } else {
                 hash = 31;
             }
             hash = 31 * hash + trailingHeaders().hashCode();
             hash = 31 * hash + super.hashCode();
             this.hash = hash;
         }
         return hash;
     }
 
     @Override
     public boolean equals(Object o) {
         if (!(o instanceof DefaultFullHttpResponse)) {
             return false;
         }
 
         DefaultFullHttpResponse other = (DefaultFullHttpResponse) o;
 
         return super.equals(other) &&
                content().equals(other.content()) &&
                trailingHeaders().equals(other.trailingHeaders());
     }
 
     @Override
     public String toString() {
         return HttpMessageUtil.appendFullResponse(new StringBuilder(256), this).toString();
     }
 }