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annotate src/org/tmatesoft/hg/util/RegularFileInfo.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 868b2ffdcd5c
children
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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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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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-1.1] 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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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 // TODO [2.0 API break] might be good idea replace channel with smth
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88 // else, to ensure #close() disposes FileDescriptor. Now
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89 // FD has usage count of two (new FileInputStream + getChannel),
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90 // and FileChannel#close decrements only 1, second has to wait FIS#finalize()
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91 return new FileInputStream(file).getChannel();
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92 }
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93 } catch (FileNotFoundException ex) {
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94 StreamLogFacility.newDefault().dump(getClass(), Info, ex, null);
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95 // shall not happen, provided this class is used correctly
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96 return new ByteArrayReadableChannel(null);
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97 }
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98 }
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99
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100 public boolean isExecutable() {
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101 return supportsExec && fileFlagsHelper.isExecutable();
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102 }
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103
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104 public boolean isSymlink() {
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105 return supportsLink && fileFlagsHelper.isSymlink();
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106 }
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107
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108 @Override
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109 public String toString() {
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110 char t = exists() ? (isExecutable() ? '*' : (isSymlink() ? '@' : '-')) : '!';
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111 return String.format("RegularFileInfo[%s %c]", file.getPath(), t);
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112 }
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113
413
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114 private byte[] getLinkTargetBytes() {
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115 assert isSymlink();
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116 // no idea what encoding Mercurial uses for link targets, assume platform native is ok
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117 return fileFlagsHelper.getSymlinkTarget().getBytes();
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118 }
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119
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120
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121 private static class ByteArrayReadableChannel implements ReadableByteChannel {
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122 private final byte[] data;
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123 private boolean closed = false; // initially open
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124 private int firstAvailIndex = 0;
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125
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126 ByteArrayReadableChannel(byte[] dataToStream) {
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127 data = dataToStream;
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128 }
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129
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130 public boolean isOpen() {
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131 return !closed;
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132 }
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133
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134 public void close() throws IOException {
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135 closed = true;
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136 }
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137
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138 public int read(ByteBuffer dst) throws IOException {
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139 if (closed) {
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140 throw new ClosedChannelException();
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141 }
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142 int remainingBytes = data.length - firstAvailIndex;
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143 if (data == null || remainingBytes == 0) {
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144 // EOF right away
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145 return -1;
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146 }
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147 int x = Math.min(dst.remaining(), remainingBytes);
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148 for (int i = firstAvailIndex, lim = firstAvailIndex + x; i < lim; i++) {
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149 dst.put(data[i]);
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150 }
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151 firstAvailIndex += x;
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152 return x;
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153 }
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154 }
287
ed6b74a58c66 Use FileInfo abstraction with necessary subset of File functionality instead of File to facilitate other effective file system iterators
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155 }