Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/HgDirstate.java @ 255:5a6ab50b4cbf

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Improve memory footprint of tag collection (about 14 Mb saved for cpython repo without HashMap.Entry and Entry[])
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Aug 2011 14:33:11 +0200
parents a6d19adc2636
children 35125450c804
rev   line source
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1 /*
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2 * Copyright (c) 2010-2011 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.repo;
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19 import java.io.BufferedReader;
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20 import java.io.File;
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21 import java.io.FileReader;
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22 import java.io.IOException;
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23 import java.util.Collections;
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24 import java.util.LinkedHashMap;
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25 import java.util.Map;
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26 import java.util.TreeSet;
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28 import org.tmatesoft.hg.core.HgBadStateException;
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29 import org.tmatesoft.hg.core.Nodeid;
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30 import org.tmatesoft.hg.internal.DataAccess;
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31 import org.tmatesoft.hg.util.Path;
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32
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34 /**
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35 * @see http://mercurial.selenic.com/wiki/DirState
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36 * @see http://mercurial.selenic.com/wiki/FileFormats#dirstate
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37 *
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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 class HgDirstate /* XXX RepoChangeListener */{
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42
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43 private final HgRepository repo;
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44 private final File dirstateFile;
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45 // deliberate String, not Path as it seems useless to keep Path here
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46 private Map<String, Record> normal;
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47 private Map<String, Record> added;
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48 private Map<String, Record> removed;
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49 private Map<String, Record> merged;
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50 private Nodeid p1, p2;
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51 private String currentBranch;
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52
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53 public HgDirstate(HgRepository hgRepo, File dirstate) {
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54 repo = hgRepo;
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55 dirstateFile = dirstate; // XXX decide whether file names shall be kept local to reader (see #branches()) or passed from outside
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56 }
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58 private void read() {
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59 normal = added = removed = merged = Collections.<String, Record>emptyMap();
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60 if (dirstateFile == null || !dirstateFile.exists()) {
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61 return;
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62 }
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63 DataAccess da = repo.getDataAccess().create(dirstateFile);
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64 if (da.isEmpty()) {
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65 return;
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66 }
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67 // not sure linked is really needed here, just for ease of debug
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68 normal = new LinkedHashMap<String, Record>();
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69 added = new LinkedHashMap<String, Record>();
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70 removed = new LinkedHashMap<String, Record>();
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71 merged = new LinkedHashMap<String, Record>();
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72 try {
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73 byte[] parents = new byte[40];
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74 da.readBytes(parents, 0, 40);
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75 p1 = Nodeid.fromBinary(parents, 0);
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76 p2 = Nodeid.fromBinary(parents, 20);
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77 parents = null;
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78 // hg init; hg up produces an empty repository where dirstate has parents (40 bytes) only
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79 while (!da.isEmpty()) {
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80 final byte state = da.readByte();
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81 final int fmode = da.readInt();
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82 final int size = da.readInt();
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83 final int time = da.readInt();
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84 final int nameLen = da.readInt();
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85 String fn1 = null, fn2 = null;
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86 byte[] name = new byte[nameLen];
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87 da.readBytes(name, 0, nameLen);
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88 for (int i = 0; i < nameLen; i++) {
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89 if (name[i] == 0) {
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90 fn1 = new String(name, 0, i, "UTF-8"); // XXX unclear from documentation what encoding is used there
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91 fn2 = new String(name, i+1, nameLen - i - 1, "UTF-8"); // need to check with different system codepages
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92 break;
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93 }
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94 }
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95 if (fn1 == null) {
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96 fn1 = new String(name);
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97 }
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98 Record r = new Record(fmode, size, time, fn1, fn2);
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99 if (state == 'n') {
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100 normal.put(r.name1, r);
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101 } else if (state == 'a') {
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102 added.put(r.name1, r);
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103 } else if (state == 'r') {
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104 removed.put(r.name1, r);
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105 } else if (state == 'm') {
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106 merged.put(r.name1, r);
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107 } else {
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108 // FIXME log error?
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109 }
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110 }
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111 } catch (IOException ex) {
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112 ex.printStackTrace(); // FIXME log error, clean dirstate?
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113 } finally {
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114 da.done();
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115 }
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116 }
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117
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118 // do not read whole dirstate if all we need is WC parent information
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119 private void readParents() {
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diff changeset
120 if (dirstateFile == null || !dirstateFile.exists()) {
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diff changeset
121 return;
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diff changeset
122 }
252
a6d19adc2636 HgRepository.getWorkingCopyBranchName() to retrieve branch associated with working directory
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diff changeset
123 DataAccess da = repo.getDataAccess().create(dirstateFile);
231
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diff changeset
124 if (da.isEmpty()) {
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diff changeset
125 return;
1792b37650f2 Introduced access to conflict resolution information (merge state)
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parents: 227
diff changeset
126 }
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diff changeset
127 try {
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diff changeset
128 byte[] parents = new byte[40];
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diff changeset
129 da.readBytes(parents, 0, 40);
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diff changeset
130 p1 = Nodeid.fromBinary(parents, 0);
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diff changeset
131 p2 = Nodeid.fromBinary(parents, 20);
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diff changeset
132 parents = null;
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diff changeset
133 } catch (IOException ex) {
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diff changeset
134 throw new HgBadStateException(ex); // XXX in fact, our exception is not the best solution here.
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diff changeset
135 } finally {
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diff changeset
136 da.done();
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diff changeset
137 }
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parents: 227
diff changeset
138 }
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diff changeset
139
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diff changeset
140 /**
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diff changeset
141 * @return array of length 2 with working copy parents, non null.
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diff changeset
142 */
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diff changeset
143 public Nodeid[] parents() {
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diff changeset
144 if (p1 == null) {
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diff changeset
145 readParents();
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diff changeset
146 }
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diff changeset
147 Nodeid[] rv = new Nodeid[2];
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diff changeset
148 rv[0] = p1;
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diff changeset
149 rv[1] = p2;
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diff changeset
150 return rv;
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diff changeset
151 }
252
a6d19adc2636 HgRepository.getWorkingCopyBranchName() to retrieve branch associated with working directory
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parents: 231
diff changeset
152
a6d19adc2636 HgRepository.getWorkingCopyBranchName() to retrieve branch associated with working directory
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diff changeset
153 /**
a6d19adc2636 HgRepository.getWorkingCopyBranchName() to retrieve branch associated with working directory
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diff changeset
154 * @return branch associated with the working directory
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diff changeset
155 */
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diff changeset
156 public String branch() {
a6d19adc2636 HgRepository.getWorkingCopyBranchName() to retrieve branch associated with working directory
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diff changeset
157 if (currentBranch == null) {
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parents: 231
diff changeset
158 currentBranch = HgRepository.DEFAULT_BRANCH_NAME;
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parents: 231
diff changeset
159 File branchFile = new File(repo.getRepositoryRoot(), "branch");
a6d19adc2636 HgRepository.getWorkingCopyBranchName() to retrieve branch associated with working directory
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parents: 231
diff changeset
160 if (branchFile.exists()) {
a6d19adc2636 HgRepository.getWorkingCopyBranchName() to retrieve branch associated with working directory
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parents: 231
diff changeset
161 try {
a6d19adc2636 HgRepository.getWorkingCopyBranchName() to retrieve branch associated with working directory
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parents: 231
diff changeset
162 BufferedReader r = new BufferedReader(new FileReader(branchFile));
a6d19adc2636 HgRepository.getWorkingCopyBranchName() to retrieve branch associated with working directory
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parents: 231
diff changeset
163 String b = r.readLine();
a6d19adc2636 HgRepository.getWorkingCopyBranchName() to retrieve branch associated with working directory
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parents: 231
diff changeset
164 if (b != null) {
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parents: 231
diff changeset
165 b = b.trim().intern();
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parents: 231
diff changeset
166 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 231
diff changeset
167 currentBranch = b == null || b.length() == 0 ? HgRepository.DEFAULT_BRANCH_NAME : b;
a6d19adc2636 HgRepository.getWorkingCopyBranchName() to retrieve branch associated with working directory
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parents: 231
diff changeset
168 r.close();
a6d19adc2636 HgRepository.getWorkingCopyBranchName() to retrieve branch associated with working directory
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parents: 231
diff changeset
169 } catch (IOException ex) {
a6d19adc2636 HgRepository.getWorkingCopyBranchName() to retrieve branch associated with working directory
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parents: 231
diff changeset
170 ex.printStackTrace(); // XXX log verbose debug, exception might be legal here (i.e. FileNotFound)
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diff changeset
171 // IGNORE
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diff changeset
172 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 231
diff changeset
173 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 231
diff changeset
174 }
a6d19adc2636 HgRepository.getWorkingCopyBranchName() to retrieve branch associated with working directory
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parents: 231
diff changeset
175 return currentBranch;
a6d19adc2636 HgRepository.getWorkingCopyBranchName() to retrieve branch associated with working directory
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parents: 231
diff changeset
176 }
231
1792b37650f2 Introduced access to conflict resolution information (merge state)
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diff changeset
177
18
02ee376bee79 status operation against current working directory
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diff changeset
178 // new, modifiable collection
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diff changeset
179 /*package-local*/ TreeSet<String> all() {
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diff changeset
180 read();
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diff changeset
181 TreeSet<String> rv = new TreeSet<String>();
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diff changeset
182 @SuppressWarnings("unchecked")
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diff changeset
183 Map<String, Record>[] all = new Map[] { normal, added, removed, merged };
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parents: 14
diff changeset
184 for (int i = 0; i < all.length; i++) {
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diff changeset
185 for (Record r : all[i].values()) {
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diff changeset
186 rv.add(r.name1);
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parents: 14
diff changeset
187 }
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parents: 14
diff changeset
188 }
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parents: 14
diff changeset
189 return rv;
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parents: 14
diff changeset
190 }
02ee376bee79 status operation against current working directory
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parents: 14
diff changeset
191
141
8248aae33f7d Adopt FileIterator moving towards WCStatusCollector parameterizing. Improved path handling, move 'em around
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 102
diff changeset
192 /*package-local*/ Record checkNormal(Path fname) {
8248aae33f7d Adopt FileIterator moving towards WCStatusCollector parameterizing. Improved path handling, move 'em around
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parents: 102
diff changeset
193 return normal.get(fname.toString());
18
02ee376bee79 status operation against current working directory
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diff changeset
194 }
02ee376bee79 status operation against current working directory
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parents: 14
diff changeset
195
141
8248aae33f7d Adopt FileIterator moving towards WCStatusCollector parameterizing. Improved path handling, move 'em around
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 102
diff changeset
196 /*package-local*/ Record checkAdded(Path fname) {
8248aae33f7d Adopt FileIterator moving towards WCStatusCollector parameterizing. Improved path handling, move 'em around
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parents: 102
diff changeset
197 return added.get(fname.toString());
8248aae33f7d Adopt FileIterator moving towards WCStatusCollector parameterizing. Improved path handling, move 'em around
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parents: 102
diff changeset
198 }
8248aae33f7d Adopt FileIterator moving towards WCStatusCollector parameterizing. Improved path handling, move 'em around
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 102
diff changeset
199 /*package-local*/ Record checkRemoved(Path fname) {
8248aae33f7d Adopt FileIterator moving towards WCStatusCollector parameterizing. Improved path handling, move 'em around
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parents: 102
diff changeset
200 return removed.get(fname.toString());
18
02ee376bee79 status operation against current working directory
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parents: 14
diff changeset
201 }
02ee376bee79 status operation against current working directory
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parents: 14
diff changeset
202 /*package-local*/ Record checkRemoved(String fname) {
02ee376bee79 status operation against current working directory
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parents: 14
diff changeset
203 return removed.get(fname);
02ee376bee79 status operation against current working directory
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parents: 14
diff changeset
204 }
141
8248aae33f7d Adopt FileIterator moving towards WCStatusCollector parameterizing. Improved path handling, move 'em around
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 102
diff changeset
205 /*package-local*/ Record checkMerged(Path fname) {
8248aae33f7d Adopt FileIterator moving towards WCStatusCollector parameterizing. Improved path handling, move 'em around
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 102
diff changeset
206 return merged.get(fname.toString());
18
02ee376bee79 status operation against current working directory
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parents: 14
diff changeset
207 }
02ee376bee79 status operation against current working directory
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parents: 14
diff changeset
208
02ee376bee79 status operation against current working directory
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diff changeset
209
02ee376bee79 status operation against current working directory
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parents: 14
diff changeset
210
02ee376bee79 status operation against current working directory
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parents: 14
diff changeset
211
93
d55d4eedfc57 Switch to Path instead of String in filenames returned by various status operations
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
212 /*package-local*/ void dump() {
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
213 read();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
214 @SuppressWarnings("unchecked")
18
02ee376bee79 status operation against current working directory
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parents: 14
diff changeset
215 Map<String, Record>[] all = new Map[] { normal, added, removed, merged };
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
216 char[] x = new char[] {'n', 'a', 'r', 'm' };
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
217 for (int i = 0; i < all.length; i++) {
18
02ee376bee79 status operation against current working directory
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parents: 14
diff changeset
218 for (Record r : all[i].values()) {
14
442dc6ee647b Show correct time
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 12
diff changeset
219 System.out.printf("%c %3o%6d %30tc\t\t%s", x[i], r.mode, r.size, (long) r.time * 1000, r.name1);
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
220 if (r.name2 != null) {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
221 System.out.printf(" --> %s", r.name2);
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parents:
diff changeset
222 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
223 System.out.println();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
224 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
225 System.out.println();
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parents:
diff changeset
226 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
227 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
228
18
02ee376bee79 status operation against current working directory
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parents: 14
diff changeset
229 /*package-local*/ static class Record {
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
230 final int mode;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
231 final int size;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
232 final int time;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
233 final String name1;
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parents:
diff changeset
234 final String name2;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
235
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
236 public Record(int fmode, int fsize, int ftime, String name1, String name2) {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
237 mode = fmode;
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parents:
diff changeset
238 size = fsize;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
239 time = ftime;
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parents:
diff changeset
240 this.name1 = name1;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
241 this.name2 = name2;
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parents:
diff changeset
242
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
243 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
244 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
245 }