Mercurial > jhg
annotate src/org/tmatesoft/hg/internal/LineReader.java @ 517:9922d1f7cb2a
Update test to use new command configuration argument (used to have followAncestry == true by default)
| author | Artem Tikhomirov <tikhomirov.artem@gmail.com> | 
|---|---|
| date | Tue, 18 Dec 2012 19:08:00 +0100 | 
| parents | e31e85cf4d4c | 
| children | 9edfd5a223b8 | 
| rev | line source | 
|---|---|
| 
480
 
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Refactor LineReader utility as stanalone class to facilitate reuse
 
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1 /* | 
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Refactor LineReader utility as stanalone class to facilitate reuse
 
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2 * Copyright (c) 2012 TMate Software Ltd | 
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3 * | 
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4 * This program is free software; you can redistribute it and/or modify | 
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5 * it under the terms of the GNU General Public License as published by | 
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6 * the Free Software Foundation; version 2 of the License. | 
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7 * | 
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8 * This program is distributed in the hope that it will be useful, | 
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of | 
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Refactor LineReader utility as stanalone class to facilitate reuse
 
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | 
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Refactor LineReader utility as stanalone class to facilitate reuse
 
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11 * GNU General Public License for more details. | 
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12 * | 
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13 * For information on how to redistribute this software under | 
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14 * the terms of a license other than GNU General Public License | 
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15 * contact TMate Software at support@hg4j.com | 
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16 */ | 
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17 package org.tmatesoft.hg.internal; | 
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18 | 
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19 import static org.tmatesoft.hg.util.LogFacility.Severity.Warn; | 
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20 | 
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21 import java.io.BufferedReader; | 
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22 import java.io.File; | 
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23 import java.io.FileReader; | 
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24 import java.io.IOException; | 
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25 import java.util.Collection; | 
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26 | 
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27 import org.tmatesoft.hg.repo.HgInvalidFileException; | 
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28 import org.tmatesoft.hg.repo.ext.MqManager; | 
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29 import org.tmatesoft.hg.util.LogFacility; | 
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30 | 
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31 /** | 
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Refactor LineReader utility as stanalone class to facilitate reuse
 
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32 * Handy class to read line-based configuration files | 
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Refactor LineReader utility as stanalone class to facilitate reuse
 
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33 * | 
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34 * @author Artem Tikhomirov | 
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35 * @author TMate Software Ltd. | 
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36 */ | 
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Refactor LineReader utility as stanalone class to facilitate reuse
 
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37 public final class LineReader { | 
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38 | 
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39 public interface LineConsumer<T> { | 
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Refactor LineReader utility as stanalone class to facilitate reuse
 
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40 // boolean begin(File f, T paramObj) throws IOException; | 
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41 boolean consume(String line, T paramObj) throws IOException; | 
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42 // boolean end(File f, T paramObj) throws IOException; | 
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43 } | 
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44 | 
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45 public static class SimpleLineCollector implements LineReader.LineConsumer<Collection<String>> { | 
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46 | 
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47 public boolean consume(String line, Collection<String> result) throws IOException { | 
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48 result.add(line); | 
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49 return true; | 
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50 } | 
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51 } | 
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52 | 
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53 private final File file; | 
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54 private final LogFacility log; | 
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55 private boolean trimLines = true; | 
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56 private boolean skipEmpty = true; | 
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57 private String ignoreThatStarts = null; | 
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58 | 
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59 public LineReader(File f, LogFacility logFacility) { | 
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60 file = f; | 
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61 log = logFacility; | 
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62 } | 
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63 | 
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64 /** | 
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65 * default: <code>true</code> | 
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66 * <code>false</code> to return line as is | 
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67 */ | 
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68 public LineReader trimLines(boolean trim) { | 
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69 trimLines = trim; | 
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70 return this; | 
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71 } | 
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72 | 
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73 /** | 
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74 * default: <code>true</code> | 
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75 * <code>false</code> to pass empty lines to consumer | 
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76 */ | 
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77 public LineReader skipEmpty(boolean skip) { | 
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78 skipEmpty = skip; | 
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79 return this; | 
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80 } | 
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81 | 
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82 /** | 
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83 * default: doesn't skip any line. | 
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84 * set e.g. to "#" or "//" to skip lines that start with such prefix | 
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85 */ | 
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86 public LineReader ignoreLineComments(String lineStart) { | 
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87 ignoreThatStarts = lineStart; | 
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88 return this; | 
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89 } | 
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90 | 
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91 public <T> void read(LineConsumer<T> consumer, T paramObj) throws HgInvalidFileException { | 
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92 BufferedReader statusFileReader = null; | 
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93 try { | 
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94 // consumer.begin(file, paramObj); | 
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95 statusFileReader = new BufferedReader(new FileReader(file)); | 
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96 String line; | 
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97 boolean ok = true; | 
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98 while (ok && (line = statusFileReader.readLine()) != null) { | 
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99 if (trimLines) { | 
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100 line = line.trim(); | 
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101 } | 
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102 if (ignoreThatStarts != null && line.startsWith(ignoreThatStarts)) { | 
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103 continue; | 
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104 } | 
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105 if (!skipEmpty || line.length() > 0) { | 
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106 ok = consumer.consume(line, paramObj); | 
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107 } | 
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108 } | 
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109 } catch (IOException ex) { | 
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110 throw new HgInvalidFileException(ex.getMessage(), ex, file); | 
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111 } finally { | 
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483
 
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112 if (statusFileReader != null) { | 
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113 try { | 
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114 statusFileReader.close(); | 
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115 } catch (IOException ex) { | 
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116 log.dump(MqManager.class, Warn, ex, null); | 
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117 } | 
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118 } | 
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119 // try { | 
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120 // consumer.end(file, paramObj); | 
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121 // } catch (IOException ex) { | 
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122 // log.warn(MqManager.class, ex, null); | 
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123 // } | 
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124 } | 
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125 } | 
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126 } | 
