/*******************************************************************************
* Copyright (c) 2012 Michael Mimo Moratti.
*
* Michael Mimo Moratti 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 ch.mimo.netty.handler.codec.icap;
import java.util.List;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.handler.codec.http.HttpChunkTrailer;
import org.jboss.netty.handler.codec.http.HttpHeaders;
/**
* Decoder State that reads http trailing headers.
*
* @author Michael Mimo Moratti (mimo@mimo.ch)
*
* @see IcapMessageDecoder
* @see StateEnum
*/
public class ReadTrailingHeadersState extends State<Object> {
public ReadTrailingHeadersState(String name) {
super(name);
}
@Override
public void onEntry(ChannelBuffer buffer, IcapMessageDecoder icapMessageDecoder) throws DecodingException {
}
@Override
public StateReturnValue execute(ChannelBuffer buffer, IcapMessageDecoder icapMessageDecoder) throws DecodingException {
SizeDelimiter sizeDelimiter = new SizeDelimiter(icapMessageDecoder.maxHttpHeaderSize);
boolean preview = icapMessageDecoder.message.isPreviewMessage();
String line = IcapDecoderUtil.readSingleHeaderLine(buffer,sizeDelimiter);
String lastHeader = null;
if (line.length() != 0) {
HttpChunkTrailer trailer = new DefaultIcapChunkTrailer(preview,false);
do {
char firstChar = line.charAt(0);
if (lastHeader != null && (firstChar == ' ' || firstChar == '\t')) {
List<String> current = trailer.getHeaders(lastHeader);
if (current.size() != 0) {
int lastPos = current.size() - 1;
String newString = current.get(lastPos) + line.trim();
current.set(lastPos, newString);
} else {
// Content-Length, Transfer-Encoding, or Trailer
}
} else {
String[] header = IcapDecoderUtil.splitHeader(line);
String name = header[0];
if (!name.equalsIgnoreCase(HttpHeaders.Names.CONTENT_LENGTH) &&
!name.equalsIgnoreCase(HttpHeaders.Names.TRANSFER_ENCODING) &&
!name.equalsIgnoreCase(HttpHeaders.Names.TRAILER)) {
trailer.addHeader(name, header[1]);
}
lastHeader = name;
}
line = IcapDecoderUtil.readSingleHeaderLine(buffer,sizeDelimiter);
} while (line.length() != 0);
return StateReturnValue.createRelevantResult(trailer);
}
return StateReturnValue.createRelevantResult(new DefaultIcapChunkTrailer(preview,false));
}
@Override
public StateEnum onExit(ChannelBuffer buffer, IcapMessageDecoder icapMessageDecoder, Object decisionInformation) throws DecodingException {
return null;
}
}