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annotate src/org/tmatesoft/hg/internal/ConfigFile.java @ 370:a2341e761609

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Let callback implementations deliver errors (e,g. own exceptions) to client code
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 22 Dec 2011 02:37:10 +0300
parents a37ce7145c3f
children 9fb990c8a724
rev   line source
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1 /*
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2 * Copyright (c) 2011 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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19 import java.io.BufferedReader;
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20 import java.io.File;
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21 import java.io.FileReader;
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22 import java.io.IOException;
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23 import java.util.ArrayList;
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24 import java.util.Collections;
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25 import java.util.LinkedHashMap;
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26 import java.util.List;
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27 import java.util.Map;
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28
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29 /**
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30 * .ini / .rc file reader
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31 * @author Artem Tikhomirov
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32 * @author TMate Software Ltd.
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33 */
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34 public class ConfigFile {
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36 private List<String> sections;
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37 private List<Map<String,String>> content;
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38
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39 public ConfigFile() {
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40 }
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41
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42 public void addLocation(File path) throws IOException {
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43 read(path);
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44 }
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45
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46 public boolean hasSection(String sectionName) {
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47 return sections == null ? false : sections.indexOf(sectionName) != -1;
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48 }
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49
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50 public List<String> getSectionNames() {
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51 return sections == null ? Collections.<String>emptyList() : Collections.unmodifiableList(sections);
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52 }
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54 public Map<String,String> getSection(String sectionName) {
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55 if (sections == null) {
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56 return Collections.emptyMap();
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57 }
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58 int x = sections.indexOf(sectionName);
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59 if (x == -1) {
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60 return Collections.emptyMap();
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61 }
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62 return Collections.unmodifiableMap(content.get(x));
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63 }
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64
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65 public boolean getBoolean(String sectionName, String key, boolean defaultValue) {
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66 String value = getSection(sectionName).get(key);
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67 if (value == null) {
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68 return defaultValue;
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69 }
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70 for (String s : new String[] { "true", "yes", "on", "1" }) {
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71 if (s.equalsIgnoreCase(value)) {
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72 return true;
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73 }
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74 }
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75 return false;
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76 }
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78 public String getString(String sectionName, String key, String defaultValue) {
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79 String value = getSection(sectionName).get(key);
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80 return value == null ? defaultValue : value;
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81 }
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82
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83 // TODO handle %include and %unset directives
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84 // TODO "" and lists
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85 // XXX perhaps, single string to keep whole section with substrings for keys/values to minimize number of arrays (String.value)
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86 private void read(File f) throws IOException {
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87 if (f == null || !f.canRead()) {
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88 return;
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89 }
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90 if (sections == null) {
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91 sections = new ArrayList<String>();
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92 content = new ArrayList<Map<String,String>>();
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93 }
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94 BufferedReader br = null;
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95 try {
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96 br = new BufferedReader(new FileReader(f));
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97 String line;
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98 String sectionName = "";
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99 Map<String,String> section = new LinkedHashMap<String, String>();
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100 while ((line = br.readLine()) != null) {
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101 line = line.trim();
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102 int x;
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103 if ((x = line.indexOf('#')) != -1) {
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104 // do not keep comments in memory, get new, shorter string
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105 line = new String(line.substring(0, x).trim());
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106 }
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107 if (line.length() <= 2) { // a=b or [a] are at least of length 3
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108 continue;
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109 }
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110 if (line.charAt(0) == '[' && line.charAt(line.length() - 1) == ']') {
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111 sectionName = line.substring(1, line.length() - 1);
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112 if (sections.indexOf(sectionName) == -1) {
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113 sections.add(sectionName);
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114 content.add(section = new LinkedHashMap<String, String>());
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115 } else {
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116 section = null; // drop cached value
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117 }
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118 } else if ((x = line.indexOf('=')) != -1) {
136
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119 // share char[] of the original string
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120 String key = line.substring(0, x).trim();
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121 String value = line.substring(x+1).trim();
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122 if (section == null) {
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123 int i = sections.indexOf(sectionName);
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124 assert i >= 0;
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125 section = content.get(i);
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126 }
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127 if (sectionName.length() == 0) {
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128 // add fake section only if there are any values
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129 sections.add(sectionName);
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130 content.add(section);
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131 }
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132 section.put(key, value);
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133 }
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134 }
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135 } finally {
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136 ((ArrayList<?>) sections).trimToSize();
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137 ((ArrayList<?>) content).trimToSize();
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138 if (br != null) {
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139 br.close();
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140 }
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141 }
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142 assert sections.size() == content.size();
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143 }
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144 }