01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one
03: * or more contributor license agreements. See the NOTICE file
04: * distributed with this work for additional information
05: * regarding copyright ownership. The ASF licenses this file
06: * to you under the Apache License, Version 2.0 (the
07: * "License"); you may not use this file except in compliance
08: * with the License. You may obtain a copy of the License at
09: *
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 IntegerDecodingState implements DecodingState {
31:
32: private int firstByte;
33: private int secondByte;
34: private int thirdByte;
35: private int counter;
36:
37: public IntegerDecodingState() {
38: }
39:
40: public DecodingState decode(IoBuffer in, ProtocolDecoderOutput out)
41: throws Exception {
42: while (in.hasRemaining()) {
43: switch (counter) {
44: case 0:
45: firstByte = in.getUnsigned();
46: break;
47: case 1:
48: secondByte = in.getUnsigned();
49: break;
50: case 2:
51: thirdByte = in.getUnsigned();
52: break;
53: case 3:
54: counter = 0;
55: return finishDecode((firstByte << 24)
56: | (secondByte << 16) | (thirdByte << 8)
57: | in.getUnsigned(), out);
58: default:
59: throw new InternalError();
60: }
61: counter++;
62: }
63:
64: return this ;
65: }
66:
67: public DecodingState finishDecode(ProtocolDecoderOutput out)
68: throws Exception {
69: throw new ProtocolDecoderException(
70: "Unexpected end of session while waiting for an integer.");
71: }
72:
73: protected abstract DecodingState finishDecode(int value,
74: ProtocolDecoderOutput out) throws Exception;
75: }
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