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package com.aragost.javahg.internals; |
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import java.io.ByteArrayOutputStream; |
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import java.io.FilterOutputStream; |
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import java.io.IOException; |
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import java.io.OutputStream; |
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import java.util.Map; |
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public class PatternReplacingOutputStream extends FilterOutputStream { |
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11 | 6 | private enum State { |
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16 | 1 | NORMAL, |
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21 | 1 | MAYBE_NAME_START, |
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26 | 1 | READING_NAME, |
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|
30 | 1 | WRITING_REPLACEMENT; |
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}; |
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33 | 7 | private final ByteArrayOutputStream nameBuffer = new ByteArrayOutputStream(20); |
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private final Map<String, byte[]> replacements; |
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37 | 7 | private State state = State.NORMAL; |
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public PatternReplacingOutputStream(OutputStream out, Map<String, byte[]> replacements) { |
40 | 7 | super(out); |
41 | 7 | this.replacements = replacements; |
42 | 7 | } |
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@Override |
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public synchronized void write(int b) throws IOException { |
46 | 1 | switch (this.state) { |
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case NORMAL: |
48 | 348 | if (b == '%') { |
49 | 11 | this.state = State.MAYBE_NAME_START; |
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} else { |
51 | 337 | super.write(b); |
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} |
53 | 337 | break; |
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case MAYBE_NAME_START: |
55 | 11 | if (b == '{') { |
56 | 10 | this.state = State.READING_NAME; |
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} else { |
58 | 1 | super.write('%'); |
59 | 1 | if (b == '%') { |
60 | 1 | this.state = State.NORMAL; |
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} else { |
62 | 0 | super.write(b); |
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} |
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} |
65 | 0 | break; |
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case READING_NAME: |
67 | 61 | if (b == '}') { |
68 | 9 | this.state = State.WRITING_REPLACEMENT; |
69 | 9 | String name = new String(this.nameBuffer.toByteArray()); |
70 | 9 | this.nameBuffer.reset(); |
71 | 9 | byte[] replacement = this.replacements.get(name); |
72 | 9 | if (replacement == null) { |
73 | 1 | replacement = ("%{" + name + "=null}").getBytes(); |
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} |
75 | 9 | this.out.write(replacement); |
76 | 9 | this.state = State.NORMAL; |
77 | 9 | } else { |
78 | 52 | this.nameBuffer.write(b); |
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} |
80 | 52 | break; |
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case WRITING_REPLACEMENT: |
82 | 0 | super.write(b); |
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break; |
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} |
85 | 420 | } |
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} |