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annotate src/org/tmatesoft/hg/util/RegularFileInfo.java @ 444:b3b1db9301a2

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Few comments that emerged while working on examples
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 May 2012 20:19:22 +0200
parents 48f993aa2f41
children 909306e412e2
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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19 import java.io.File;
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20 import java.io.FileInputStream;
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21 import java.io.FileNotFoundException;
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22 import java.io.IOException;
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23 import java.nio.ByteBuffer;
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24 import java.nio.channels.ClosedChannelException;
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25 import java.nio.channels.ReadableByteChannel;
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26
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27 import org.tmatesoft.hg.core.SessionContext;
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28 import org.tmatesoft.hg.internal.StreamLogFacility;
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29
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30 /**
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31 *
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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 RegularFileInfo implements FileInfo {
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36 private final boolean supportsExec, supportsLink;
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37 private final RegularFileStats fileFlagsHelper; // null if both supportsLink and supportExec are false
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38 private File file;
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39
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40 public RegularFileInfo(SessionContext ctx) {
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41 this(ctx, false, false);
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42 }
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43 public RegularFileInfo(SessionContext ctx, boolean supportExecFlag, boolean supportSymlink) {
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44 supportsLink = supportSymlink;
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45 supportsExec = supportExecFlag;
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46 if (supportSymlink || supportExecFlag) {
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47 fileFlagsHelper = new RegularFileStats(ctx);
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48 } else {
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49 fileFlagsHelper = null;
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50 }
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51 }
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53 public void init(File f) {
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54 file = f;
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55 if (fileFlagsHelper != null) {
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56 fileFlagsHelper.init(file);
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57 }
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58 }
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60 public boolean exists() {
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61 // java.io.File for symlinks without proper target says it doesn't exist.
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62 // 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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63 return isSymlink() || (file.canRead() && file.isFile());
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64 }
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66 public int lastModified() {
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67 // TODO post-1.0 for symlinks, this returns incorrect mtime of the target file, not that of link itself
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68 // Besides, timestame if link points to non-existing file is 0.
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69 // However, it result only in slowdown in WCStatusCollector, as it need to perform additional content check
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70 return (int) (file.lastModified() / 1000);
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71 }
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73 public long length() {
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74 if (isSymlink()) {
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75 return getLinkTargetBytes().length;
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76 }
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77 return file.length();
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78 }
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80 public ReadableByteChannel newInputChannel() {
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81 try {
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82 if (isSymlink()) {
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83 return new ByteArrayReadableChannel(getLinkTargetBytes());
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84 } else {
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85 return new FileInputStream(file).getChannel();
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86 }
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87 } catch (FileNotFoundException ex) {
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88 StreamLogFacility.newDefault().debug(getClass(), ex, null);
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89 // shall not happen, provided this class is used correctly
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90 return new ByteArrayReadableChannel(null);
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91 }
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92 }
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94 public boolean isExecutable() {
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95 return supportsExec && fileFlagsHelper.isExecutable();
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96 }
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98 public boolean isSymlink() {
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99 return supportsLink && fileFlagsHelper.isSymlink();
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100 }
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101
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102 private byte[] getLinkTargetBytes() {
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103 assert isSymlink();
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104 // no idea what encoding Mercurial uses for link targets, assume platform native is ok
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105 return fileFlagsHelper.getSymlinkTarget().getBytes();
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106 }
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108
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109 private static class ByteArrayReadableChannel implements ReadableByteChannel {
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110 private final byte[] data;
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111 private boolean closed = false; // initially open
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112 private int firstAvailIndex = 0;
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113
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114 ByteArrayReadableChannel(byte[] dataToStream) {
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115 data = dataToStream;
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116 }
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117
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118 public boolean isOpen() {
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119 return !closed;
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120 }
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121
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122 public void close() throws IOException {
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123 closed = true;
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124 }
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125
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126 public int read(ByteBuffer dst) throws IOException {
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127 if (closed) {
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128 throw new ClosedChannelException();
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129 }
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130 int remainingBytes = data.length - firstAvailIndex;
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131 if (data == null || remainingBytes == 0) {
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132 // EOF right away
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133 return -1;
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134 }
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135 int x = Math.min(dst.remaining(), remainingBytes);
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136 for (int i = firstAvailIndex, lim = firstAvailIndex + x; i < lim; i++) {
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137 dst.put(data[i]);
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138 }
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139 firstAvailIndex += x;
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140 return x;
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141 }
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142 }
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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143 }