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annotate src/org/tmatesoft/hg/internal/FNCacheFile.java @ 539:9edfd5a223b8

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Commit: handle empty repository case
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 13 Feb 2013 18:44:58 +0100
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children 6ca3d0c5b4bc
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539
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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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.charset.Charset;
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23 import java.util.ArrayList;
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24
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25 import org.tmatesoft.hg.util.Path;
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26
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27 /**
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28 * <blockquote>
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29 * 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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30 * </blockquote>
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31 * @see http://mercurial.selenic.com/wiki/fncacheRepoFormat
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32 * @author Artem Tikhomirov
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33 * @author TMate Software Ltd.
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34 */
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35 public class FNCacheFile {
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36
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37 private final Internals repo;
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38 private final ArrayList<Path> files;
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39
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40 public FNCacheFile(Internals internalRepo) {
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41 repo = internalRepo;
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42 files = new ArrayList<Path>();
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43 }
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44
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45 public void read(Path.Source pathFactory) throws IOException {
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46 File f = fncacheFile();
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47 files.clear();
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48 if (!f.exists()) {
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49 return;
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50 }
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51 ArrayList<String> entries = new ArrayList<String>();
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52 // names in fncache are in local encoding, shall translate to unicode
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53 new LineReader(f, repo.getSessionContext().getLog(), repo.getFilenameEncoding()).read(new LineReader.SimpleLineCollector(), entries);
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54 for (String e : entries) {
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55 files.add(pathFactory.path(e));
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56 }
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57 }
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58
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59 public void write() throws IOException {
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60 if (files.isEmpty()) {
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61 return;
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62 }
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63 File f = fncacheFile();
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64 f.getParentFile().mkdirs();
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65 final Charset filenameEncoding = repo.getFilenameEncoding();
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66 FileOutputStream fncacheFile = new FileOutputStream(f);
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67 for (Path p : files) {
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68 String s = "data/" + p.toString() + ".i"; // TODO post-1.0 this is plain wrong. (a) likely need .d files, too; (b) what about dh/ location?
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69 fncacheFile.write(s.getBytes(filenameEncoding));
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70 fncacheFile.write(0x0A); // http://mercurial.selenic.com/wiki/fncacheRepoFormat
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71 }
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72 fncacheFile.close();
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73 }
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74
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75 public void add(Path p) {
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76 files.add(p);
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77 }
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78
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79 private File fncacheFile() {
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80 return repo.getFileFromStoreDir("fncache");
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81 }
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82 }