Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/ConfigFile.java @ 617:65c01508f002

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Rollback support for commands that modify repository. Strategy to keep complete copy of a file being changed
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 15 May 2013 20:10:09 +0200
parents e1b29756f901
children 6526d8adbc0f
rev   line source
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1 /*
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2 * Copyright (c) 2011-2013 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.ByteArrayOutputStream;
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20 import java.io.File;
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21 import java.io.FileOutputStream;
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22 import java.io.IOException;
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23 import java.io.PrintStream;
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24 import java.nio.ByteBuffer;
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25 import java.nio.channels.FileChannel;
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26 import java.nio.channels.FileLock;
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27 import java.util.ArrayList;
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28 import java.util.Collections;
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29 import java.util.Iterator;
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30 import java.util.LinkedHashMap;
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31 import java.util.List;
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32 import java.util.Map;
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34 import org.tmatesoft.hg.core.SessionContext;
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35 import org.tmatesoft.hg.repo.HgInvalidFileException;
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36 import org.tmatesoft.hg.util.LogFacility;
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37
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38 /**
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39 * .ini / .rc file reader
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40 * @author Artem Tikhomirov
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41 * @author TMate Software Ltd.
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42 */
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43 public class ConfigFile {
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45 private final SessionContext sessionContext;
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46 private List<String> sections;
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47 private List<Map<String,String>> content;
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48
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49 public ConfigFile(SessionContext ctx) {
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50 sessionContext = ctx;
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51 }
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53 public void addLocation(File path) throws HgInvalidFileException {
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54 read(path);
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55 }
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57 public boolean hasSection(String sectionName) {
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58 return sections == null ? false : sections.indexOf(sectionName) != -1;
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59 }
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60
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61 public List<String> getSectionNames() {
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62 return sections == null ? Collections.<String>emptyList() : Collections.unmodifiableList(sections);
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63 }
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64
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65 /**
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66 * Access map of section keys and values.
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67 * @param sectionName name of the section to retrieve
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68 * @return never <code>null</code>, empty map in case no section with specified name found
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69 */
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70 public Map<String,String> getSection(String sectionName) {
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71 if (sections == null) {
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72 return Collections.emptyMap();
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73 }
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74 int x = sections.indexOf(sectionName);
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75 if (x == -1) {
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76 return Collections.emptyMap();
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77 }
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78 return Collections.unmodifiableMap(content.get(x));
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79 }
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81 public boolean getBoolean(String sectionName, String key, boolean defaultValue) {
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82 String value = getSection(sectionName).get(key);
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83 if (value == null) {
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84 return defaultValue;
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85 }
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86 for (String s : new String[] { "true", "yes", "on", "1" }) {
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87 if (s.equalsIgnoreCase(value)) {
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88 return true;
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89 }
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90 }
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91 return false;
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92 }
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94 public String getString(String sectionName, String key, String defaultValue) {
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95 String value = getSection(sectionName).get(key);
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96 return value == null ? defaultValue : value;
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97 }
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99 public int getInteger(String sectionName, String key, int defaultValue) {
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100 String value = getSection(sectionName).get(key);
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101 return value == null ? defaultValue : Integer.parseInt(value);
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102 }
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104 public void putString(String sectionName, String key, String newValue) {
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105 Map<String, String> section = null;
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106 if (sections == null) {
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107 // init, in case we didn't read any file with prev config
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108 sections = new ArrayList<String>();
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109 content = new ArrayList<Map<String,String>>();
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110 }
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111 int x = sections.indexOf(sectionName);
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112 if (x == -1) {
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113 if (newValue == null) {
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114 return;
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115 }
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116 sections.add(sectionName);
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117 content.add(section = new LinkedHashMap<String, String>());
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118 } else {
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119 section = content.get(x);
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120 }
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121 if (newValue == null) {
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122 section.remove(key);
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123 } else {
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124 section.put(key, newValue);
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125 }
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126 }
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127
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128 private void read(File f) throws HgInvalidFileException {
114
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129 if (f == null || !f.canRead()) {
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130 return;
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131 }
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132 if (sections == null) {
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133 sections = new ArrayList<String>();
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134 content = new ArrayList<Map<String,String>>();
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135 }
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136 new Parser().go(f, this);
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137 ((ArrayList<?>) sections).trimToSize();
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138 ((ArrayList<?>) content).trimToSize();
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139 assert sections.size() == content.size();
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140 }
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141
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142 public void writeTo(File f) throws IOException {
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143 byte[] data = compose();
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144 if (!f.exists()) {
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145 f.createNewFile();
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146 }
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147 FileChannel fc = new FileOutputStream(f).getChannel();
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148 FileLock fl = fc.lock();
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149 try {
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150 fc.write(ByteBuffer.wrap(data));
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151 } finally {
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152 fl.release();
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153 fc.close();
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154 }
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155 }
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156
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157 private byte[] compose() {
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158 ByteArrayOutputStream bos = new ByteArrayOutputStream(1024);
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159 PrintStream ps = new PrintStream(bos);
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160 Iterator<String> sectionNames = sections.iterator();
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161 for (Map<String,String> s : content) {
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162 final String name = sectionNames.next(); // iterate through names despite section may be empty
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163 if (s.isEmpty()) {
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164 continue; // do not write an empty section
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165 }
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166 ps.print('[');
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167 ps.print(name);
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168 ps.println(']');
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169 for (Map.Entry<String, String> e : s.entrySet()) {
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170 ps.print(e.getKey());
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171 ps.print('=');
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172 ps.println(e.getValue());
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173 }
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174 ps.println();
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175 }
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176 ps.flush();
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177 return bos.toByteArray();
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178 }
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179
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180 private static class Parser implements LineReader.LineConsumer<ConfigFile> {
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181
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182 private String sectionName = "";
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183 private Map<String,String> section = new LinkedHashMap<String, String>();
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184 private File contextFile;
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185
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186 // TODO [post-1.1] "" and lists
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187 // XXX perhaps, single string to keep whole section with substrings for keys/values to minimize number of arrays (String.value)
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188 public boolean consume(String line, ConfigFile cfg) throws IOException {
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189 int x;
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190 if ((x = line.indexOf('#')) != -1) {
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191 // do not keep comments in memory, get new, shorter string
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192 line = new String(line.substring(0, x).trim());
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193 }
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194 if (line.length() <= 2) { // a=b or [a] are at least of length 3
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195 return true;
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196 }
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197 if (line.charAt(0) == '[' && line.charAt(line.length() - 1) == ']') {
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198 sectionName = line.substring(1, line.length() - 1);
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199 if (cfg.sections.indexOf(sectionName) == -1) {
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200 cfg.sections.add(sectionName);
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201 cfg.content.add(section = new LinkedHashMap<String, String>());
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202 } else {
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203 section = null; // drop cached value
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204 }
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205 } else if (line.startsWith("%unset")) {
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206 if (section != null) {
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207 section.remove(line.substring(7).trim());
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208 }
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209 } else if (line.startsWith("%include")) {
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210 processInclude(line.substring(9).trim(), cfg);
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211 } else if ((x = line.indexOf('=')) != -1) {
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212 // share char[] of the original string
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213 String key = line.substring(0, x).trim();
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214 String value = line.substring(x+1).trim();
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215 if (section == null) {
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216 int i = cfg.sections.indexOf(sectionName);
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217 assert i >= 0;
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218 section = cfg.content.get(i);
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219 }
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220 if (sectionName.length() == 0) {
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221 // add fake section only if there are any values
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222 cfg.sections.add(sectionName);
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223 cfg.content.add(section);
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224 }
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225 section.put(key, value);
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226 }
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227 return true;
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228 }
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229
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230 public void go(File f, ConfigFile cfg) throws HgInvalidFileException {
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231 contextFile = f;
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232 LineReader lr = new LineReader(f, cfg.sessionContext.getLog());
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233 lr.ignoreLineComments("#");
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234 lr.read(this, cfg);
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235 }
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236
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237 // include failure doesn't propagate
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238 private void processInclude(String includeValue, ConfigFile cfg) {
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239 File f;
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240 // TODO [post-1.1] handle environment variable expansion
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241 if (includeValue.startsWith("~/")) {
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242 f = new File(System.getProperty("user.home"), includeValue.substring(2));
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243 } else {
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244 f = new File(contextFile.getParentFile(), includeValue);
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245 }
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246 try {
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247 if (f.canRead()) {
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248 new Parser().go(f, cfg);
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249 } else {
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250 LogFacility lf = cfg.sessionContext.getLog();
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251 lf.dump(ConfigFile.class, LogFacility.Severity.Debug, "Can't read file to include: %s", f);
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252 }
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253 } catch (HgInvalidFileException ex) {
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254 LogFacility lf = cfg.sessionContext.getLog();
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255 lf.dump(ConfigFile.class, LogFacility.Severity.Warn, "Can't include %s (%s)", f, includeValue);
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256 }
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257 }
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258 }
69
5a69397f0f99 Discovery utility for Hg network protocol finally in the repo, with quick-n-dirty ConfigFile impl that helps to hide auth info
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259 }