Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/ConfigFile.java @ 444:b3b1db9301a2

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Few comments that emerged while working on examples
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 May 2012 20:19:22 +0200
parents 9fb990c8a724
children e31e85cf4d4c
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.ByteArrayOutputStream;
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21 import java.io.File;
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22 import java.io.FileOutputStream;
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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.io.PrintStream;
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26 import java.nio.ByteBuffer;
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27 import java.nio.channels.FileChannel;
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28 import java.nio.channels.FileLock;
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29 import java.util.ArrayList;
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30 import java.util.Collections;
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31 import java.util.Iterator;
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32 import java.util.LinkedHashMap;
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33 import java.util.List;
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34 import java.util.Map;
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35
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36 /**
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37 * .ini / .rc file reader
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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 class ConfigFile {
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43 private List<String> sections;
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44 private List<Map<String,String>> content;
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45
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46 public ConfigFile() {
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47 }
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48
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49 public void addLocation(File path) throws IOException {
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50 read(path);
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51 }
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52
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53 public boolean hasSection(String sectionName) {
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54 return sections == null ? false : sections.indexOf(sectionName) != -1;
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55 }
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56
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57 public List<String> getSectionNames() {
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58 return sections == null ? Collections.<String>emptyList() : Collections.unmodifiableList(sections);
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59 }
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61 public Map<String,String> getSection(String sectionName) {
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62 if (sections == null) {
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63 return Collections.emptyMap();
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64 }
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65 int x = sections.indexOf(sectionName);
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66 if (x == -1) {
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67 return Collections.emptyMap();
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68 }
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69 return Collections.unmodifiableMap(content.get(x));
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70 }
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71
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72 public boolean getBoolean(String sectionName, String key, boolean defaultValue) {
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73 String value = getSection(sectionName).get(key);
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74 if (value == null) {
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75 return defaultValue;
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76 }
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77 for (String s : new String[] { "true", "yes", "on", "1" }) {
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78 if (s.equalsIgnoreCase(value)) {
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79 return true;
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80 }
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81 }
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82 return false;
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83 }
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85 public String getString(String sectionName, String key, String defaultValue) {
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86 String value = getSection(sectionName).get(key);
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87 return value == null ? defaultValue : value;
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88 }
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89
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90 public void putString(String sectionName, String key, String newValue) {
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91 Map<String, String> section = null;
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92 if (sections == null) {
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93 // init, in case we didn't read any file with prev config
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94 sections = new ArrayList<String>();
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95 content = new ArrayList<Map<String,String>>();
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96 }
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97 int x = sections.indexOf(sectionName);
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98 if (x == -1) {
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99 if (newValue == null) {
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100 return;
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101 }
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102 sections.add(sectionName);
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103 content.add(section = new LinkedHashMap<String, String>());
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104 } else {
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105 section = content.get(x);
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106 }
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107 if (newValue == null) {
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108 section.remove(key);
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109 } else {
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110 section.put(key, newValue);
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111 }
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112 }
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113
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114 // TODO handle %include and %unset directives
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115 // TODO "" and lists
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116 // XXX perhaps, single string to keep whole section with substrings for keys/values to minimize number of arrays (String.value)
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117 private void read(File f) throws IOException {
114
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118 if (f == null || !f.canRead()) {
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119 return;
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120 }
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121 if (sections == null) {
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122 sections = new ArrayList<String>();
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123 content = new ArrayList<Map<String,String>>();
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124 }
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125 BufferedReader br = null;
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126 try {
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127 br = new BufferedReader(new FileReader(f));
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128 String line;
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129 String sectionName = "";
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130 Map<String,String> section = new LinkedHashMap<String, String>();
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131 while ((line = br.readLine()) != null) {
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132 line = line.trim();
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133 int x;
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134 if ((x = line.indexOf('#')) != -1) {
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135 // do not keep comments in memory, get new, shorter string
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136 line = new String(line.substring(0, x).trim());
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137 }
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138 if (line.length() <= 2) { // a=b or [a] are at least of length 3
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139 continue;
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140 }
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141 if (line.charAt(0) == '[' && line.charAt(line.length() - 1) == ']') {
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142 sectionName = line.substring(1, line.length() - 1);
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143 if (sections.indexOf(sectionName) == -1) {
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144 sections.add(sectionName);
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145 content.add(section = new LinkedHashMap<String, String>());
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146 } else {
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147 section = null; // drop cached value
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148 }
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149 } else if ((x = line.indexOf('=')) != -1) {
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150 // share char[] of the original string
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151 String key = line.substring(0, x).trim();
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152 String value = line.substring(x+1).trim();
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153 if (section == null) {
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154 int i = sections.indexOf(sectionName);
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155 assert i >= 0;
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156 section = content.get(i);
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157 }
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158 if (sectionName.length() == 0) {
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159 // add fake section only if there are any values
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160 sections.add(sectionName);
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161 content.add(section);
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162 }
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163 section.put(key, value);
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164 }
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165 }
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166 } finally {
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167 ((ArrayList<?>) sections).trimToSize();
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168 ((ArrayList<?>) content).trimToSize();
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169 if (br != null) {
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170 br.close();
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171 }
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172 }
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173 assert sections.size() == content.size();
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174 }
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175
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176 public void writeTo(File f) throws IOException {
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177 byte[] data = compose();
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178 if (!f.exists()) {
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179 f.createNewFile();
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180 }
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181 FileChannel fc = new FileOutputStream(f).getChannel();
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182 FileLock fl = fc.lock();
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183 try {
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184 fc.write(ByteBuffer.wrap(data));
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185 } finally {
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186 fl.release();
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187 fc.close();
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188 }
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189 }
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190
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191 private byte[] compose() {
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192 ByteArrayOutputStream bos = new ByteArrayOutputStream(1024);
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193 PrintStream ps = new PrintStream(bos);
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194 Iterator<String> sectionNames = sections.iterator();
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195 for (Map<String,String> s : content) {
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196 final String name = sectionNames.next(); // iterate through names despite section may be empty
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197 if (s.isEmpty()) {
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198 continue; // do not write an empty section
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199 }
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200 ps.print('[');
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201 ps.print(name);
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202 ps.println(']');
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203 for (Map.Entry<String, String> e : s.entrySet()) {
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204 ps.print(e.getKey());
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205 ps.print('=');
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206 ps.println(e.getValue());
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207 }
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208 ps.println();
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209 }
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210 ps.flush();
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211 return bos.toByteArray();
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212 }
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213 }