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annotate src/org/tmatesoft/hg/internal/FNCacheFile.java @ 624:507602cb4fb3

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FIXMEs and TODOs: pay some technical debt
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 20 May 2013 20:34:33 +0200
parents 5e0313485eef
children c75297c17867
rev   line source
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1 /*
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2 * Copyright (c) 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.File;
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20 import java.io.FileOutputStream;
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21 import java.io.IOException;
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22 import java.nio.ByteBuffer;
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23 import java.nio.CharBuffer;
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24 import java.nio.channels.FileChannel;
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25 import java.nio.charset.Charset;
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26 import java.util.ArrayList;
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27 import java.util.List;
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28
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29 import org.tmatesoft.hg.util.Path;
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30
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31 /**
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32 * Append-only fncache support
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33 *
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34 * <blockquote>
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35 * The fncache file contains the paths of all filelog files in the store as encoded by mercurial.filelog.encodedir. The paths are separated by '\n' (LF).
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36 * </blockquote>
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37 * @see http://mercurial.selenic.com/wiki/fncacheRepoFormat
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38 *
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39 *
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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 FNCacheFile {
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44
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45 private final Internals repo;
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46 // private final List<Path> files;
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47 private final List<Path> addedDotI;
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48 private final List<Path> addedDotD;
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49 private final FNCachePathHelper pathHelper;
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50
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51 public FNCacheFile(Internals internalRepo) {
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52 repo = internalRepo;
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53 // files = new ArrayList<Path>();
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54 pathHelper = new FNCachePathHelper();
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55 addedDotI = new ArrayList<Path>(5);
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56 addedDotD = new ArrayList<Path>(5);
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57 }
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58
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59 /*
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60 * For append-only option, we don't care reading the original content
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61 public void read(Path.Source pathFactory) throws IOException {
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62 File f = fncacheFile();
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63 files.clear();
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64 if (!f.exists()) {
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65 return;
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66 }
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67 ArrayList<String> entries = new ArrayList<String>();
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68 // names in fncache are in local encoding, shall translate to unicode
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69 new LineReader(f, repo.getSessionContext().getLog(), repo.getFilenameEncoding()).read(new LineReader.SimpleLineCollector(), entries);
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70 for (String e : entries) {
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71 // XXX plain wrong, need either to decode paths and strip off .i/.d or (if keep names as is) change write()
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72 files.add(pathFactory.path(e));
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73 }
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74 }
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75 */
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76
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77 public void write() throws IOException {
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78 if (addedDotI.isEmpty() && addedDotD.isEmpty()) {
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79 return;
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80 }
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81 File f = fncacheFile();
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82 f.getParentFile().mkdirs();
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83 final Charset filenameEncoding = repo.getFilenameEncoding();
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84 ArrayList<CharBuffer> added = new ArrayList<CharBuffer>();
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85 for (Path p : addedDotI) {
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86 added.add(CharBuffer.wrap(pathHelper.rewrite(p)));
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87 }
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88 for (Path p : addedDotD) {
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89 // XXX FNCachePathHelper always return name of an index file, need to change it into a name of data file,
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90 // although the approach (to replace last char) is depressingly awful
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91 CharSequence cs = pathHelper.rewrite(p);
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92 CharBuffer cb = CharBuffer.allocate(cs.length());
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93 cb.append(cs);
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94 cb.put(cs.length()-1, 'd');
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95 cb.flip();
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96 added.add(cb);
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97 }
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98 FileChannel fncacheFile = new FileOutputStream(f, true).getChannel();
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99 ByteBuffer lf = ByteBuffer.wrap(new byte[] { 0x0A });
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100 for (CharBuffer b : added) {
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101 fncacheFile.write(filenameEncoding.encode(b));
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102 fncacheFile.write(lf);
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103 lf.rewind();
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104 }
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105 fncacheFile.close();
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106 }
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107
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108 public void addIndex(Path p) {
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109 addedDotI.add(p);
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110 }
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111
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112 public void addData(Path p) {
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113 addedDotD.add(p);
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114 }
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115
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116 private File fncacheFile() {
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117 return repo.getFileFromStoreDir("fncache");
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118 }
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119 }