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annotate src/org/tmatesoft/hg/internal/LineReader.java @ 606:5daa42067e7c

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Avoid mmap files when only few bytes are to be read
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 07 May 2013 14:16:35 +0200
parents 8cbc2a883d95
children 507602cb4fb3
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 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.FileInputStream;
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24 import java.io.FileReader;
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25 import java.io.IOException;
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26 import java.io.InputStreamReader;
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27 import java.io.Reader;
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28 import java.nio.charset.Charset;
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29 import java.util.Collection;
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30
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31 import org.tmatesoft.hg.repo.HgInvalidFileException;
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32 import org.tmatesoft.hg.repo.ext.MqManager;
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33 import org.tmatesoft.hg.util.LogFacility;
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34
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35 /**
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36 * Handy class to read line-based configuration files
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37 *
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38 * @author Artem Tikhomirov
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39 * @author TMate Software Ltd.
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40 */
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41 public final class LineReader {
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42
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43 public interface LineConsumer<T> {
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44 // boolean begin(File f, T paramObj) throws IOException;
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45 boolean consume(String line, T paramObj) throws IOException;
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46 // boolean end(File f, T paramObj) throws IOException;
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47 }
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48
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49 public static class SimpleLineCollector implements LineReader.LineConsumer<Collection<String>> {
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50
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51 public boolean consume(String line, Collection<String> result) throws IOException {
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52 result.add(line);
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53 return true;
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54 }
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55 }
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56
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57 private final File file;
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58 private final LogFacility log;
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59 private final Charset encoding;
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60 private boolean trimLines = true;
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61 private boolean skipEmpty = true;
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62 private String ignoreThatStarts = null;
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63
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64 public LineReader(File f, LogFacility logFacility) {
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65 this(f, logFacility, null);
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66 }
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67
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68 public LineReader(File f, LogFacility logFacility, Charset lineEncoding) {
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69 file = f;
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70 log = logFacility;
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71 encoding = lineEncoding;
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72 }
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73
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74 /**
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75 * default: <code>true</code>
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76 * <code>false</code> to return line as is
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77 */
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78 public LineReader trimLines(boolean trim) {
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79 trimLines = trim;
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80 return this;
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81 }
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82
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83 /**
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84 * default: <code>true</code>
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85 * <code>false</code> to pass empty lines to consumer
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86 */
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87 public LineReader skipEmpty(boolean skip) {
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88 skipEmpty = skip;
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89 return this;
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90 }
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91
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92 /**
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93 * default: doesn't skip any line.
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94 * set e.g. to "#" or "//" to skip lines that start with such prefix
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95 */
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96 public LineReader ignoreLineComments(String lineStart) {
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97 ignoreThatStarts = lineStart;
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98 return this;
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99 }
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100
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101 public <T> void read(LineConsumer<T> consumer, T paramObj) throws HgInvalidFileException {
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102 BufferedReader statusFileReader = null;
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103 try {
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104 // consumer.begin(file, paramObj);
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105 Reader fileReader;
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106 if (encoding == null) {
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107 fileReader = new FileReader(file);
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108 } else {
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109 fileReader = new InputStreamReader(new FileInputStream(file), encoding);
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110 }
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111 statusFileReader = new BufferedReader(fileReader);
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112 String line;
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113 boolean ok = true;
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114 while (ok && (line = statusFileReader.readLine()) != null) {
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115 if (trimLines) {
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116 line = line.trim();
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117 }
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118 if (ignoreThatStarts != null && line.startsWith(ignoreThatStarts)) {
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119 continue;
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120 }
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121 if (!skipEmpty || line.length() > 0) {
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122 ok = consumer.consume(line, paramObj);
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123 }
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124 }
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125 } catch (IOException ex) {
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126 throw new HgInvalidFileException(ex.getMessage(), ex, file);
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127 } finally {
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128 if (statusFileReader != null) {
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129 try {
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130 statusFileReader.close();
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131 } catch (IOException ex) {
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132 log.dump(MqManager.class, Warn, ex, null);
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133 }
480
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134 }
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135 // try {
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136 // consumer.end(file, paramObj);
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137 // } catch (IOException ex) {
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138 // log.warn(MqManager.class, ex, null);
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139 // }
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140 }
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141 }
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142 }