Mercurial > jhg
annotate src/org/tmatesoft/hg/util/RegularFileInfo.java @ 534:243202f1bda5
Commit: refactor revision creation code from clone command to work separately, fit into existing library structure
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Mon, 04 Feb 2013 18:00:55 +0100 (2013-02-04) |
parents | c02b5710d9ac |
children | 868b2ffdcd5c |
rev | line source |
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1 /* |
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2 * Copyright (c) 2011-2012 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.util; |
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18 |
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19 import static org.tmatesoft.hg.util.LogFacility.Severity.Info; |
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20 |
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21 import java.io.File; |
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22 import java.io.FileInputStream; |
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23 import java.io.FileNotFoundException; |
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24 import java.io.IOException; |
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25 import java.nio.ByteBuffer; |
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26 import java.nio.channels.ClosedChannelException; |
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27 import java.nio.channels.ReadableByteChannel; |
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28 |
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29 import org.tmatesoft.hg.core.SessionContext; |
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30 import org.tmatesoft.hg.internal.StreamLogFacility; |
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31 |
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32 /** |
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33 * |
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34 * @author Artem Tikhomirov |
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35 * @author TMate Software Ltd. |
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36 */ |
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37 public class RegularFileInfo implements FileInfo { |
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38 private final boolean supportsExec, supportsLink; |
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39 private final RegularFileStats fileFlagsHelper; // null if both supportsLink and supportExec are false |
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40 private File file; |
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41 |
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42 public RegularFileInfo(SessionContext ctx) { |
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43 this(ctx, false, false); |
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44 } |
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45 public RegularFileInfo(SessionContext ctx, boolean supportExecFlag, boolean supportSymlink) { |
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46 supportsLink = supportSymlink; |
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47 supportsExec = supportExecFlag; |
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48 if (supportSymlink || supportExecFlag) { |
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49 fileFlagsHelper = new RegularFileStats(ctx); |
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50 } else { |
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51 fileFlagsHelper = null; |
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52 } |
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53 } |
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54 |
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55 public void init(File f) { |
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56 file = f; |
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57 if (fileFlagsHelper != null) { |
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58 fileFlagsHelper.init(file); |
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59 } |
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60 } |
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61 |
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62 public boolean exists() { |
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63 // java.io.File for symlinks without proper target says it doesn't exist. |
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64 // since we found this symlink in directory listing, it's safe to say it exists just based on the fact it's link |
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65 return isSymlink() || (file.canRead() && file.isFile()); |
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66 } |
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67 |
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68 public int lastModified() { |
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69 // TODO post-1.0 for symlinks, this returns incorrect mtime of the target file, not that of link itself |
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70 // Besides, timestame if link points to non-existing file is 0. |
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71 // However, it result only in slowdown in WCStatusCollector, as it need to perform additional content check |
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72 return (int) (file.lastModified() / 1000); |
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73 } |
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74 |
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75 public long length() { |
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76 if (isSymlink()) { |
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77 return getLinkTargetBytes().length; |
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78 } |
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79 return file.length(); |
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80 } |
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81 |
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82 public ReadableByteChannel newInputChannel() { |
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83 try { |
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84 if (isSymlink()) { |
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85 return new ByteArrayReadableChannel(getLinkTargetBytes()); |
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86 } else { |
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87 return new FileInputStream(file).getChannel(); |
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88 } |
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89 } catch (FileNotFoundException ex) { |
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90 StreamLogFacility.newDefault().dump(getClass(), Info, ex, null); |
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91 // shall not happen, provided this class is used correctly |
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92 return new ByteArrayReadableChannel(null); |
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93 } |
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94 } |
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95 |
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96 public boolean isExecutable() { |
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97 return supportsExec && fileFlagsHelper.isExecutable(); |
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98 } |
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99 |
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100 public boolean isSymlink() { |
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101 return supportsLink && fileFlagsHelper.isSymlink(); |
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102 } |
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103 |
476
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104 @Override |
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105 public String toString() { |
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106 char t = exists() ? (isExecutable() ? '*' : (isSymlink() ? '@' : '-')) : '!'; |
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107 return String.format("RegularFileInfo[%s %c]", file.getPath(), t); |
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108 } |
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109 |
413
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110 private byte[] getLinkTargetBytes() { |
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111 assert isSymlink(); |
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112 // no idea what encoding Mercurial uses for link targets, assume platform native is ok |
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113 return fileFlagsHelper.getSymlinkTarget().getBytes(); |
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114 } |
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115 |
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116 |
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117 private static class ByteArrayReadableChannel implements ReadableByteChannel { |
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118 private final byte[] data; |
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119 private boolean closed = false; // initially open |
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120 private int firstAvailIndex = 0; |
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121 |
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122 ByteArrayReadableChannel(byte[] dataToStream) { |
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123 data = dataToStream; |
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124 } |
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125 |
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126 public boolean isOpen() { |
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127 return !closed; |
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128 } |
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129 |
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130 public void close() throws IOException { |
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131 closed = true; |
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132 } |
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133 |
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134 public int read(ByteBuffer dst) throws IOException { |
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135 if (closed) { |
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136 throw new ClosedChannelException(); |
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137 } |
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138 int remainingBytes = data.length - firstAvailIndex; |
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139 if (data == null || remainingBytes == 0) { |
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140 // EOF right away |
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141 return -1; |
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142 } |
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143 int x = Math.min(dst.remaining(), remainingBytes); |
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144 for (int i = firstAvailIndex, lim = firstAvailIndex + x; i < lim; i++) { |
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145 dst.put(data[i]); |
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146 } |
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147 firstAvailIndex += x; |
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148 return x; |
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149 } |
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150 } |
287
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151 } |