Mercurial > jhg
annotate src/org/tmatesoft/hg/internal/LineReader.java @ 686:f1f095e42555
Annotated file is not always changed in the latest changeset, need to find out last changest it was changed at (iow, diffed to with BlameHelper)
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Thu, 25 Jul 2013 22:12:14 +0200 (2013-07-25) |
parents | 12a4f60ea972 |
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rev | line source |
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1 /* |
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2 * Copyright (c) 2012-2013 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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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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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 java.io.BufferedReader; |
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20 import java.io.File; |
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21 import java.io.FileInputStream; |
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22 import java.io.FileReader; |
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23 import java.io.IOException; |
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24 import java.io.InputStreamReader; |
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25 import java.io.Reader; |
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26 import java.nio.charset.Charset; |
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27 import java.util.Collection; |
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28 |
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29 import org.tmatesoft.hg.core.HgIOException; |
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30 import org.tmatesoft.hg.util.LogFacility; |
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31 |
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32 /** |
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33 * Handy class to read line-based configuration files |
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34 * |
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35 * @author Artem Tikhomirov |
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36 * @author TMate Software Ltd. |
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37 */ |
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38 public final class LineReader { |
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39 |
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40 public interface LineConsumer<T> { |
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41 // boolean begin(File f, T paramObj) throws IOException; |
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42 boolean consume(String line, T paramObj) throws IOException; |
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43 // boolean end(File f, T paramObj) throws IOException; |
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44 } |
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45 |
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46 public static class SimpleLineCollector implements LineReader.LineConsumer<Collection<String>> { |
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47 |
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48 public boolean consume(String line, Collection<String> result) throws IOException { |
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49 result.add(line); |
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50 return true; |
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51 } |
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52 } |
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53 |
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54 private final File file; |
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55 private final LogFacility log; |
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56 private final Charset encoding; |
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57 private boolean trimLines = true; |
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58 private boolean skipEmpty = true; |
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59 private String ignoreThatStarts = null; |
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60 |
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61 public LineReader(File f, LogFacility logFacility) { |
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62 this(f, logFacility, null); |
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63 } |
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64 |
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65 public LineReader(File f, LogFacility logFacility, Charset lineEncoding) { |
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66 file = f; |
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67 log = logFacility; |
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68 encoding = lineEncoding; |
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69 } |
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70 |
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71 /** |
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72 * default: <code>true</code> |
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73 * <code>false</code> to return line as is |
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74 */ |
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75 public LineReader trimLines(boolean trim) { |
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76 trimLines = trim; |
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77 return this; |
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78 } |
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79 |
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80 /** |
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81 * default: <code>true</code> |
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82 * <code>false</code> to pass empty lines to consumer |
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83 */ |
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84 public LineReader skipEmpty(boolean skip) { |
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85 skipEmpty = skip; |
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86 return this; |
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87 } |
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88 |
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89 /** |
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90 * default: doesn't skip any line. |
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91 * set e.g. to "#" or "//" to skip lines that start with such prefix |
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92 */ |
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93 public LineReader ignoreLineComments(String lineStart) { |
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94 ignoreThatStarts = lineStart; |
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95 return this; |
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96 } |
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97 |
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98 /** |
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99 * |
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100 * @param consumer where to pipe read lines to |
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101 * @param paramObj parameterizes consumer |
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102 * @return paramObj value for convenience |
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103 * @throws HgIOException if there's {@link IOException} while reading file |
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104 */ |
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105 public <T> T read(LineConsumer<T> consumer, T paramObj) throws HgIOException { |
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106 BufferedReader statusFileReader = null; |
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107 try { |
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108 // consumer.begin(file, paramObj); |
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109 Reader fileReader; |
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110 if (encoding == null) { |
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111 fileReader = new FileReader(file); |
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112 } else { |
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113 fileReader = new InputStreamReader(new FileInputStream(file), encoding); |
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114 } |
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115 statusFileReader = new BufferedReader(fileReader); |
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116 String line; |
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117 boolean ok = true; |
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118 while (ok && (line = statusFileReader.readLine()) != null) { |
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119 if (trimLines) { |
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120 line = line.trim(); |
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121 } |
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122 if (ignoreThatStarts != null && line.startsWith(ignoreThatStarts)) { |
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123 continue; |
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124 } |
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125 if (!skipEmpty || line.length() > 0) { |
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126 ok = consumer.consume(line, paramObj); |
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127 } |
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128 } |
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129 return paramObj; |
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130 } catch (IOException ex) { |
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131 throw new HgIOException(ex.getMessage(), ex, file); |
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132 } finally { |
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133 new FileUtils(log, this).closeQuietly(statusFileReader); |
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134 // try { |
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135 // consumer.end(file, paramObj); |
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136 // } catch (IOException ex) { |
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137 // log.warn(getClass(), ex, null); |
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138 // } |
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139 } |
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140 } |
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141 } |