View Javadoc

1   /*******************************************************************************
2    * Copyright (c) 2011 Michael Mimo Moratti.
3    *
4    * Michael Mimo Moratti licenses this file to you under the Apache License, version 2.0
5    * (the "License"); you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at:
7    *     http://www.apache.org/licenses/LICENSE-2.0
8    * Unless required by applicable law or agreed to in writing, software
9    * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
10   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
11   * License for the specific language governing permissions and limitations
12   * under the License.
13   *******************************************************************************/
14  package ch.mimo.netty.handler.codec.icap;
15  
16  import org.jboss.netty.buffer.ChannelBuffer;
17  
18  /**
19   * Decoder State that reads chunk delimiters
20   * 
21   * @author Michael Mimo Moratti (mimo@mimo.ch)
22   *
23   * @see IcapMessageDecoder
24   * @see StateEnum
25   */
26  public class ReadChunkDelimiterState extends State<Object> {
27  
28  	public ReadChunkDelimiterState(String name) {
29  		super(name);
30  	}
31  
32  	@Override
33  	public void onEntry(ChannelBuffer buffer, IcapMessageDecoder icapMessageDecoder) throws DecodingException {
34  	}
35  
36  	@Override
37  	public StateReturnValue execute(ChannelBuffer buffer, IcapMessageDecoder icapMessageDecoder) throws DecodingException {
38          for (;;) {
39              byte next = buffer.readByte();
40              if (next == IcapCodecUtil.CR) {
41                  if (buffer.readByte() == IcapCodecUtil.LF) {
42                      return StateReturnValue.createIrrelevantResult();
43                  }
44              } else if (next == IcapCodecUtil.LF) {
45                  return StateReturnValue.createIrrelevantResult();
46              }
47          }
48  	}
49  
50  	@Override
51  	public StateEnum onExit(ChannelBuffer buffer, IcapMessageDecoder icapMessageDecoder, Object decisionInformation) throws DecodingException {
52  		return StateEnum.READ_CHUNK_SIZE_STATE;
53  	}
54  
55  }