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annotate src/org/tmatesoft/hg/internal/LineReader.java @ 480:f3fab7a20841

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Refactor LineReader utility as stanalone class to facilitate reuse
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 17 Jul 2012 22:14:21 +0200
parents
children e31e85cf4d4c
rev   line source
480
f3fab7a20841 Refactor LineReader utility as stanalone class to facilitate reuse
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1 /*
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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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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 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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32 * Handy class to read line-based configuration files
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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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37 public final class LineReader {
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38
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39 public interface LineConsumer<T> {
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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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112 try {
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113 statusFileReader.close();
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114 } catch (IOException ex) {
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115 log.dump(MqManager.class, Warn, ex, null);
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116 }
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117 // try {
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118 // consumer.end(file, paramObj);
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119 // } catch (IOException ex) {
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120 // log.warn(MqManager.class, ex, null);
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121 // }
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122 }
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123 }
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124 }