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annotate src/com/tmate/hgkit/ll/LocalHgRepo.java @ 9:d6d2a630f4a6

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Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 25 Dec 2010 04:45:59 +0100
parents a78c980749e3
children 382cfe9463db
rev   line source
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1 /**
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2 * Copyright (c) 2010 Artem Tikhomirov
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3 */
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4 package com.tmate.hgkit.ll;
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5
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6 import java.io.BufferedReader;
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7 import java.io.File;
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8 import java.io.FileInputStream;
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9 import java.io.IOException;
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10 import java.io.InputStreamReader;
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11 import java.lang.ref.SoftReference;
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12 import java.util.Arrays;
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13 import java.util.HashMap;
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14 import java.util.TreeSet;
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16 /**
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17 * @author artem
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18 */
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19 public class LocalHgRepo extends HgRepository {
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20
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21 private File repoDir; // .hg folder
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22 private final String repoLocation;
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23
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24 public LocalHgRepo(String repositoryPath) {
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25 setInvalid(true);
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26 repoLocation = repositoryPath;
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27 }
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29 public LocalHgRepo(File repositoryRoot) throws IOException {
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30 assert ".hg".equals(repositoryRoot.getName()) && repositoryRoot.isDirectory();
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31 setInvalid(false);
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32 repoDir = repositoryRoot;
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33 repoLocation = repositoryRoot.getParentFile().getCanonicalPath();
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34 parseRequires();
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35 }
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36
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37 @Override
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38 public String getLocation() {
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39 return repoLocation;
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40 }
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41
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42 private final HashMap<String, SoftReference<RevlogStream>> streamsCache = new HashMap<String, SoftReference<RevlogStream>>();
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43
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44 /**
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45 * path - repository storage path (i.e. one usually with .i or .d)
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46 */
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47 @Override
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48 protected RevlogStream resolve(String path) {
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49 final SoftReference<RevlogStream> ref = streamsCache.get(path);
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50 RevlogStream cached = ref == null ? null : ref.get();
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51 if (cached != null) {
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52 return cached;
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53 }
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54 File f = new File(repoDir, path);
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55 if (f.exists()) {
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56 RevlogStream s = new RevlogStream(f);
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57 streamsCache.put(path, new SoftReference<RevlogStream>(s));
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58 return s;
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59 }
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60 return null;
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61 }
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62
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63 @Override
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64 public HgDataFile getFileNode(String path) {
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65 String nPath = normalize(path);
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66 String storagePath = toStoragePath(nPath, true);
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67 RevlogStream content = resolve(storagePath);
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68 // XXX no content when no file? or HgDataFile.exists() to detect that? How about files that were removed in previous releases?
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69 return new HgDataFile(this, nPath, content);
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70 }
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71
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72 private boolean revlogv1;
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73 private boolean store;
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74 private boolean fncache;
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75 private boolean dotencode;
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76
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77
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78 private void parseRequires() {
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79 File requiresFile = new File(repoDir, "requires");
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80 if (!requiresFile.exists()) {
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81 return;
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82 }
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83 try {
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84 BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(requiresFile)));
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85 String line;
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86 while ((line = br.readLine()) != null) {
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87 revlogv1 |= "revlogv1".equals(line);
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88 store |= "store".equals(line);
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89 fncache |= "fncache".equals(line);
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90 dotencode |= "dotencode".equals(line);
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91 }
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92 } catch (IOException ex) {
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93 ex.printStackTrace(); // FIXME log
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94 }
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95 }
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96
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97 // FIXME document what path argument is, whether it includes .i or .d, and whether it's 'normalized' (slashes) or not.
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98 // since .hg/store keeps both .i files and files without extension (e.g. fncache), guees, for data == false
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99 // we shall assume path has extension
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100 // FIXME much more to be done, see store.py:_hybridencode
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101 // @see http://mercurial.selenic.com/wiki/CaseFoldingPlan
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102 @Override
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103 protected String toStoragePath(String path, boolean data) {
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104 path = normalize(path);
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105 final String STR_STORE = "store/";
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106 final String STR_DATA = "data/";
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107 final String STR_DH = "dh/";
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108 if (!data) {
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109 return this.store ? STR_STORE + path : path;
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110 }
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111 path = path.replace(".hg/", ".hg.hg/").replace(".i/", ".i.hg/").replace(".d/", ".d.hg/");
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112 StringBuilder sb = new StringBuilder(path.length() << 1);
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113 if (store || fncache) {
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114 // encodefilename
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115 final String reservedChars = "\\:*?\"<>|";
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116 // in fact, \\ is unlikely to match, ever - we've replaced all of them already, above. Just regards to store.py
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117 int x;
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118 char[] hexByte = new char[2];
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119 for (int i = 0; i < path.length(); i++) {
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120 final char ch = path.charAt(i);
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121 if (ch >= 'a' && ch <= 'z') {
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122 sb.append(ch); // POIRAE
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123 } else if (ch >= 'A' && ch <= 'Z') {
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124 sb.append('_');
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125 sb.append(Character.toLowerCase(ch)); // Perhaps, (char) (((int) ch) + 32)? Even better, |= 0x20?
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126 } else if ( (x = reservedChars.indexOf(ch)) != -1) {
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127 sb.append('~');
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128 sb.append(toHexByte(reservedChars.charAt(x), hexByte));
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129 } else if ((ch >= '~' /*126*/ && ch <= 255) || ch < ' ' /*32*/) {
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130 sb.append('~');
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131 sb.append(toHexByte(ch, hexByte));
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132 } else if (ch == '_') {
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133 // note, encoding from store.py:_buildencodefun and :_build_lower_encodefun
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134 // differ in the way they process '_' (latter doesn't escape it)
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135 sb.append('_');
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136 sb.append('_');
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137 } else {
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138 sb.append(ch);
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139 }
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140 }
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141 // auxencode
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142 if (fncache) {
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143 x = 0; // last segment start
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144 final TreeSet<String> windowsReservedFilenames = new TreeSet<String>();
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145 windowsReservedFilenames.addAll(Arrays.asList("con prn aux nul com1 com2 com3 com4 com5 com6 com7 com8 com9 lpt1 lpt2 lpt3 lpt4 lpt5 lpt6 lpt7 lpt8 lpt9".split(" ")));
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146 do {
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147 int i = sb.indexOf("/", x);
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148 if (i == -1) {
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149 i = sb.length();
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150 }
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151 // windows reserved filenames are at least of length 3
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152 if (i - x >= 3) {
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153 boolean found = false;
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154 if (i-x == 3) {
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155 found = windowsReservedFilenames.contains(sb.subSequence(x, i));
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156 } else if (sb.charAt(x+3) == '.') { // implicit i-x > 3
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157 found = windowsReservedFilenames.contains(sb.subSequence(x, x+3));
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158 } else if (i-x > 4 && sb.charAt(x+4) == '.') {
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159 found = windowsReservedFilenames.contains(sb.subSequence(x, x+4));
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160 }
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161 if (found) {
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162 sb.setCharAt(x, '~');
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163 sb.insert(x+1, toHexByte(sb.charAt(x+2), hexByte));
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164 i += 2;
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165 }
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166 }
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167 if (dotencode && (sb.charAt(x) == '.' || sb.charAt(x) == ' ')) {
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168 sb.insert(x+1, toHexByte(sb.charAt(x), hexByte));
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169 sb.setCharAt(x, '~'); // setChar *after* charAt/insert to get ~2e, not ~7e for '.'
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170 i += 2;
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171 }
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172 x = i+1;
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173 } while (x < sb.length());
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174 }
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175 }
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176 final int MAX_PATH_LEN_IN_HGSTORE = 120;
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177 if (fncache && (sb.length() + STR_DATA.length() > MAX_PATH_LEN_IN_HGSTORE)) {
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178 throw HgRepository.notImplemented(); // FIXME digest and fncache use
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179 }
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180 if (this.store) {
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181 sb.insert(0, STR_STORE + STR_DATA);
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182 }
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183 sb.append(".i");
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184 return sb.toString();
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185 }
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186
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187 private static char[] toHexByte(int ch, char[] buf) {
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188 assert buf.length > 1;
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189 final String hexDigits = "0123456789abcdef";
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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190 buf[0] = hexDigits.charAt((ch & 0x00F0) >>> 4);
8
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191 buf[1] = hexDigits.charAt(ch & 0x0F);
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192 return buf;
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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193 }
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194
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195 // TODO handle . and .. (although unlikely to face them from GUI client)
3
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196 private static String normalize(String path) {
8
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197 path = path.replace('\\', '/').replace("//", "/");
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198 if (path.startsWith("/")) {
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199 path = path.substring(1);
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200 }
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201 return path;
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202 }
1
a3576694a4d1 Repository detection from local/specified directory
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203 }