/*
    * 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 java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  import org.jboss.netty.buffer.ChannelBuffer;
  import org.jboss.netty.buffer.ChannelBuffers;
  
  /**
   * The default {@link HttpChunkTrailer} implementation.
   */
  public class DefaultHttpChunkTrailer implements HttpChunkTrailer {
  
      private final HttpHeaders headers = new HttpHeaders() {
          @Override
          void validateHeaderName(String name) {
              super.validateHeaderName(name);
              if (name.equalsIgnoreCase(HttpHeaders.Names.CONTENT_LENGTH) ||
                  name.equalsIgnoreCase(HttpHeaders.Names.TRANSFER_ENCODING) ||
                  name.equalsIgnoreCase(HttpHeaders.Names.TRAILER)) {
                  throw new IllegalArgumentException(
                          "prohibited trailing header: " + name);
              }
          }
      };
  
      public boolean isLast() {
          return true;
      }
  
      public void addHeader(final String name, final Object value) {
          headers.addHeader(name, value);
      }
  
      public void setHeader(final String name, final Object value) {
          headers.setHeader(name, value);
      }
  
      public void setHeader(final String name, final Iterable<?> values) {
          headers.setHeader(name, values);
      }
  
      public void removeHeader(final String name) {
          headers.removeHeader(name);
      }
  
      public void clearHeaders() {
          headers.clearHeaders();
      }
  
      public String getHeader(final String name) {
          return headers.getHeader(name);
      }
  
      public List<String> getHeaders(final String name) {
          return headers.getHeaders(name);
      }
  
      public List<Map.Entry<String, String>> getHeaders() {
          return headers.getHeaders();
      }
  
      public boolean containsHeader(final String name) {
          return headers.containsHeader(name);
      }
  
      public Set<String> getHeaderNames() {
          return headers.getHeaderNames();
      }
  
      public ChannelBuffer getContent() {
          return ChannelBuffers.EMPTY_BUFFER;
      }
  
      public void setContent(ChannelBuffer content) {
          throw new IllegalStateException("read-only");
      }
  }