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.ProtocolDecoderOutput;
24:
25: /**
26: * Skips data until {@link #canSkip(byte)} returns <tt>false</tt>.
27: *
28: * @author The Apache MINA Project (dev@mina.apache.org)
29: * @version $Rev: 601994 $, $Date: 2007-12-06 21:58:00 -0700 (Thu, 06 Dec 2007) $
30: */
31: public abstract class SkippingState implements DecodingState {
32:
33: private int skippedBytes;
34:
35: /**
36: * Creates a new instance.
37: */
38: public SkippingState() {
39: }
40:
41: public DecodingState decode(IoBuffer in, ProtocolDecoderOutput out)
42: throws Exception {
43: int beginPos = in.position();
44: int limit = in.limit();
45: for (int i = beginPos; i < limit; i++) {
46: byte b = in.get(i);
47: if (!canSkip(b)) {
48: in.position(i);
49: int answer = this .skippedBytes;
50: this .skippedBytes = 0;
51: return finishDecode(answer);
52: } else {
53: skippedBytes++;
54: }
55: }
56:
57: in.position(limit);
58: return this ;
59: }
60:
61: public DecodingState finishDecode(ProtocolDecoderOutput out)
62: throws Exception {
63: return finishDecode(skippedBytes);
64: }
65:
66: protected abstract boolean canSkip(byte b);
67:
68: protected abstract DecodingState finishDecode(int skippedBytes)
69: throws Exception;
70: }
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