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20 package org.apache.mina.filter.codec.statemachine;
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22 import org.apache.mina.core.buffer.IoBuffer;
23 import org.apache.mina.filter.codec.ProtocolDecoderOutput;
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31 public abstract class ConsumeToDynamicTerminatorDecodingState implements DecodingState {
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33 private IoBuffer buffer;
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38 public DecodingState decode(IoBuffer in, ProtocolDecoderOutput out) throws Exception {
39 int beginPos = in.position();
40 int terminatorPos = -1;
41 int limit = in.limit();
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43 for (int i = beginPos; i < limit; i++) {
44 byte b = in.get(i);
45 if (isTerminator(b)) {
46 terminatorPos = i;
47 break;
48 }
49 }
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51 if (terminatorPos >= 0) {
52 IoBuffer product;
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54 if (beginPos < terminatorPos) {
55 in.limit(terminatorPos);
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57 if (buffer == null) {
58 product = in.slice();
59 } else {
60 buffer.put(in);
61 product = buffer.flip();
62 buffer = null;
63 }
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65 in.limit(limit);
66 } else {
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68 if (buffer == null) {
69 product = IoBuffer.allocate(0);
70 } else {
71 product = buffer.flip();
72 buffer = null;
73 }
74 }
75 in.position(terminatorPos + 1);
76 return finishDecode(product, out);
77 }
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79 if (buffer == null) {
80 buffer = IoBuffer.allocate(in.remaining());
81 buffer.setAutoExpand(true);
82 }
83 buffer.put(in);
84 return this;
85 }
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90 public DecodingState finishDecode(ProtocolDecoderOutput out) throws Exception {
91 IoBuffer product;
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93 if (buffer == null) {
94 product = IoBuffer.allocate(0);
95 } else {
96 product = buffer.flip();
97 buffer = null;
98 }
99 return finishDecode(product, out);
100 }
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109 protected abstract boolean isTerminator(byte b);
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122 protected abstract DecodingState finishDecode(IoBuffer product, ProtocolDecoderOutput out) throws Exception;
123 }