/*
    * Copyright 2012 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:
    *
    *   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 org.jboss.netty.handler.codec.http;
  
  import org.jboss.netty.buffer.ChannelBuffer;
  import org.jboss.netty.buffer.ChannelBuffers;
  import org.jboss.netty.util.internal.StringUtil;
  
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  /**
   * The default {@link HttpMessage} implementation.
   */
  public class DefaultHttpMessage implements HttpMessage {
  
      private final HttpHeaders headers = new DefaultHttpHeaders(true);
      private HttpVersion version;
      private ChannelBuffer content = ChannelBuffers.EMPTY_BUFFER;
      private boolean chunked;
  
      /**
       * Creates a new instance.
       */
      protected DefaultHttpMessage(final HttpVersion version) {
          setProtocolVersion(version);
      }
  
      public HttpHeaders headers() {
          return headers;
      }
  
      public boolean isChunked() {
          if (chunked) {
              return true;
          } else {
              return HttpCodecUtil.isTransferEncodingChunked(this);
          }
      }
  
      public void setChunked(boolean chunked) {
          this.chunked = chunked;
          if (chunked) {
              setContent(ChannelBuffers.EMPTY_BUFFER);
          }
      }
  
      public void setContent(ChannelBuffer content) {
          if (content == null) {
              content = ChannelBuffers.EMPTY_BUFFER;
          }
          if (content.readable() && isChunked()) {
              throw new IllegalArgumentException(
                      "non-empty content disallowed if this.chunked == true");
          }
          this.content = content;
      }
  
      public HttpVersion getProtocolVersion() {
          return version;
      }
  
      public void setProtocolVersion(HttpVersion version) {
          if (version == null) {
              throw new NullPointerException("version");
          }
          this.version = version;
      }
  
      public ChannelBuffer getContent() {
          return content;
      }
  
      @Override
      public String toString() {
          StringBuilder buf = new StringBuilder();
          buf.append(getClass().getSimpleName());
          buf.append("(version: ");
          buf.append(getProtocolVersion().getText());
          buf.append(", keepAlive: ");
          buf.append(HttpHeaders.isKeepAlive(this));
          buf.append(", chunked: ");
          buf.append(isChunked());
          buf.append(')');
          buf.append(StringUtil.NEWLINE);
         appendHeaders(buf);
 
         // Remove the last newline.
         buf.setLength(buf.length() - StringUtil.NEWLINE.length());
         return buf.toString();
     }
 
     void appendHeaders(StringBuilder buf) {
         for (Map.Entry<String, String> e: headers()) {
             buf.append(e.getKey());
             buf.append(": ");
             buf.append(e.getValue());
             buf.append(StringUtil.NEWLINE);
         }
     }
 }