1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 *
19 */
20 package org.apache.mina.filter.codec.statemachine;
21
22 import org.apache.mina.common.IoBuffer;
23 import org.apache.mina.filter.codec.ProtocolDecoderException;
24 import org.apache.mina.filter.codec.ProtocolDecoderOutput;
25
26 /**
27 * @author The Apache MINA Project (dev@mina.apache.org)
28 * @version $Rev: 601994 $, $Date: 2007-12-06 21:58:00 -0700 (Thu, 06 Dec 2007) $
29 */
30 public abstract class SingleByteDecodingState implements DecodingState {
31
32 public SingleByteDecodingState() {
33 }
34
35 public DecodingState decode(IoBuffer in, ProtocolDecoderOutput out)
36 throws Exception {
37 if (in.hasRemaining()) {
38 return finishDecode(in.get(), out);
39 } else {
40 return this;
41 }
42 }
43
44 public DecodingState finishDecode(ProtocolDecoderOutput out)
45 throws Exception {
46 throw new ProtocolDecoderException(
47 "Unexpected end of session while waiting for a single byte.");
48 }
49
50 protected abstract DecodingState finishDecode(byte b,
51 ProtocolDecoderOutput out) throws Exception;
52 }