Mercurial > jhg
annotate src/org/tmatesoft/hg/internal/LineReader.java @ 494:2743641f2f12
Defect: use of 0 as configuration value for mapio boundary results in every file being memmap-ed
| author | Artem Tikhomirov <tikhomirov.artem@gmail.com> | 
|---|---|
| date | Thu, 18 Oct 2012 19:51:07 +0200 | 
| parents | e31e85cf4d4c | 
| children | 9edfd5a223b8 | 
| rev | line source | 
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| 480 
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changeset | 1 /* | 
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changeset | 2 * Copyright (c) 2012 TMate Software Ltd | 
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changeset | 3 * | 
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changeset | 4 * This program is free software; you can redistribute it and/or modify | 
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changeset | 5 * it under the terms of the GNU General Public License as published by | 
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changeset | 6 * the Free Software Foundation; version 2 of the License. | 
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changeset | 7 * | 
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changeset | 8 * This program is distributed in the hope that it will be useful, | 
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changeset | 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of | 
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changeset | 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | 
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changeset | 11 * GNU General Public License for more details. | 
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changeset | 12 * | 
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changeset | 13 * For information on how to redistribute this software under | 
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changeset | 14 * the terms of a license other than GNU General Public License | 
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changeset | 15 * contact TMate Software at support@hg4j.com | 
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changeset | 16 */ | 
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changeset | 17 package org.tmatesoft.hg.internal; | 
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changeset | 18 | 
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changeset | 19 import static org.tmatesoft.hg.util.LogFacility.Severity.Warn; | 
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changeset | 20 | 
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changeset | 21 import java.io.BufferedReader; | 
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changeset | 22 import java.io.File; | 
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changeset | 23 import java.io.FileReader; | 
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changeset | 24 import java.io.IOException; | 
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changeset | 25 import java.util.Collection; | 
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changeset | 26 | 
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changeset | 27 import org.tmatesoft.hg.repo.HgInvalidFileException; | 
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changeset | 28 import org.tmatesoft.hg.repo.ext.MqManager; | 
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changeset | 29 import org.tmatesoft.hg.util.LogFacility; | 
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changeset | 30 | 
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changeset | 31 /** | 
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changeset | 32 * Handy class to read line-based configuration files | 
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changeset | 33 * | 
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changeset | 34 * @author Artem Tikhomirov | 
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changeset | 35 * @author TMate Software Ltd. | 
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changeset | 36 */ | 
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changeset | 37 public final class LineReader { | 
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changeset | 38 | 
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changeset | 39 public interface LineConsumer<T> { | 
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changeset | 40 // boolean begin(File f, T paramObj) throws IOException; | 
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changeset | 41 boolean consume(String line, T paramObj) throws IOException; | 
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changeset | 42 // boolean end(File f, T paramObj) throws IOException; | 
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changeset | 43 } | 
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changeset | 44 | 
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changeset | 45 public static class SimpleLineCollector implements LineReader.LineConsumer<Collection<String>> { | 
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changeset | 46 | 
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changeset | 47 public boolean consume(String line, Collection<String> result) throws IOException { | 
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changeset | 48 result.add(line); | 
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changeset | 49 return true; | 
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changeset | 50 } | 
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changeset | 51 } | 
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changeset | 52 | 
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changeset | 53 private final File file; | 
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changeset | 54 private final LogFacility log; | 
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changeset | 55 private boolean trimLines = true; | 
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changeset | 56 private boolean skipEmpty = true; | 
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changeset | 57 private String ignoreThatStarts = null; | 
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changeset | 58 | 
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changeset | 59 public LineReader(File f, LogFacility logFacility) { | 
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changeset | 60 file = f; | 
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changeset | 61 log = logFacility; | 
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changeset | 62 } | 
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changeset | 63 | 
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changeset | 64 /** | 
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changeset | 65 * default: <code>true</code> | 
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changeset | 66 * <code>false</code> to return line as is | 
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changeset | 67 */ | 
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changeset | 68 public LineReader trimLines(boolean trim) { | 
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changeset | 69 trimLines = trim; | 
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changeset | 70 return this; | 
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changeset | 71 } | 
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changeset | 72 | 
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changeset | 73 /** | 
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changeset | 74 * default: <code>true</code> | 
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changeset | 75 * <code>false</code> to pass empty lines to consumer | 
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changeset | 76 */ | 
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changeset | 77 public LineReader skipEmpty(boolean skip) { | 
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changeset | 78 skipEmpty = skip; | 
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changeset | 79 return this; | 
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changeset | 80 } | 
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changeset | 81 | 
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changeset | 82 /** | 
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changeset | 83 * default: doesn't skip any line. | 
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changeset | 84 * set e.g. to "#" or "//" to skip lines that start with such prefix | 
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changeset | 85 */ | 
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changeset | 86 public LineReader ignoreLineComments(String lineStart) { | 
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changeset | 87 ignoreThatStarts = lineStart; | 
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changeset | 88 return this; | 
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changeset | 89 } | 
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changeset | 90 | 
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changeset | 91 public <T> void read(LineConsumer<T> consumer, T paramObj) throws HgInvalidFileException { | 
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changeset | 92 BufferedReader statusFileReader = null; | 
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changeset | 93 try { | 
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changeset | 94 // consumer.begin(file, paramObj); | 
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changeset | 95 statusFileReader = new BufferedReader(new FileReader(file)); | 
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changeset | 96 String line; | 
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changeset | 97 boolean ok = true; | 
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changeset | 98 while (ok && (line = statusFileReader.readLine()) != null) { | 
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changeset | 99 if (trimLines) { | 
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changeset | 100 line = line.trim(); | 
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changeset | 101 } | 
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changeset | 102 if (ignoreThatStarts != null && line.startsWith(ignoreThatStarts)) { | 
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changeset | 103 continue; | 
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changeset | 104 } | 
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changeset | 105 if (!skipEmpty || line.length() > 0) { | 
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changeset | 106 ok = consumer.consume(line, paramObj); | 
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changeset | 107 } | 
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changeset | 108 } | 
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changeset | 109 } catch (IOException ex) { | 
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changeset | 110 throw new HgInvalidFileException(ex.getMessage(), ex, file); | 
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changeset | 111 } finally { | 
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changeset | 112 if (statusFileReader != null) { | 
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changeset | 113 try { | 
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changeset | 114 statusFileReader.close(); | 
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changeset | 115 } catch (IOException ex) { | 
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changeset | 116 log.dump(MqManager.class, Warn, ex, null); | 
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changeset | 117 } | 
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changeset | 118 } | 
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changeset | 119 // try { | 
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changeset | 120 // consumer.end(file, paramObj); | 
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changeset | 121 // } catch (IOException ex) { | 
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Refactor LineReader utility as stanalone class to facilitate reuse
 Artem Tikhomirov <tikhomirov.artem@gmail.com> parents: diff
changeset | 122 // log.warn(MqManager.class, ex, null); | 
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f3fab7a20841
Refactor LineReader utility as stanalone class to facilitate reuse
 Artem Tikhomirov <tikhomirov.artem@gmail.com> parents: diff
changeset | 123 // } | 
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f3fab7a20841
Refactor LineReader utility as stanalone class to facilitate reuse
 Artem Tikhomirov <tikhomirov.artem@gmail.com> parents: diff
changeset | 124 } | 
| 
f3fab7a20841
Refactor LineReader utility as stanalone class to facilitate reuse
 Artem Tikhomirov <tikhomirov.artem@gmail.com> parents: diff
changeset | 125 } | 
| 
f3fab7a20841
Refactor LineReader utility as stanalone class to facilitate reuse
 Artem Tikhomirov <tikhomirov.artem@gmail.com> parents: diff
changeset | 126 } | 
