annotate servlet/src/digilib/io/DocuDirCache.java @ 160:aecb57fb8f96

servlet version 1.16a4 - rather experimental - new Texter servlet for sending text - reads and caches text files in DocuDirCache - DocuFile renamed to ImageFile (-Set) - new TextFile
author robcast
date Tue, 16 Sep 2003 18:32:00 +0200
parents e743b853efca
children 67ff8c7fecb9
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1 /* DocuDirCache.java
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2
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3 Digital Image Library servlet components
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4
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5 Copyright (C) 2003 Robert Casties (robcast@mail.berlios.de)
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6
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7 This program is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2 of the License, or (at your
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10 option) any later version.
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11
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12 Please read license.txt for the full details. A copy of the GPL
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13 may be found at http://www.gnu.org/copyleft/lgpl.html
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program; if not, write to the Free Software
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 * Created on 03.03.2003
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20 */
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21
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22 package digilib.io;
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23
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24 import java.io.File;
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25 import java.util.HashMap;
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26 import java.util.Iterator;
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27 import java.util.LinkedList;
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28 import java.util.List;
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29
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30 /**
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31 * @author casties
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32 */
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33 public class DocuDirCache {
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34
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35 /** HashMap of directories */
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36 private HashMap map = null;
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37 /** names of base directories */
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38 private String[] baseDirNames = null;
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39 /** array of allowed file classes (image/text) */
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40 private int[] fileClasses = null;
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41 /** number of files in the whole cache (approximate) */
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42 private long numFiles = 0;
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43 /** number of cache hits */
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44 private long hits = 0;
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45 /** number of cache misses */
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46 private long misses = 0;
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47
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48 /** Constructor with array of base directory names and file classes.
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49 *
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50 * @param bd base directory names
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51 */
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52 public DocuDirCache(String[] bd, int[] fileClasses) {
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53 baseDirNames = bd;
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54 map = new HashMap();
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55 this.fileClasses = fileClasses;
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56 }
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57 /** Constructor with array of base directory names.
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58 *
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59 * @param bd base directory names
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60 */
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61 public DocuDirCache(String[] bd) {
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62 baseDirNames = bd;
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63 map = new HashMap();
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64 // default file class is CLASS_IMAGE
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65 fileClasses = new int[1];
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66 fileClasses[0] = FileOps.CLASS_IMAGE;
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67 }
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68
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69 /** The number of directories in the cache.
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70 * @return
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71 */
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72 public int size() {
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73 return (map != null) ? map.size() : 0;
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74 }
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75
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76 /** Add a DocuDirectory to the cache.
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77 *
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78 * @param newdir
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79 */
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80 public void put(DocuDirectory newdir) {
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81 String s = newdir.getDirName();
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82 if (map.containsKey(s)) {
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83 System.out.println("Baah, duplicate key in DocuDirCache.put!");
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84 } else {
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85 map.put(s, newdir);
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86 numFiles += newdir.size();
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87 }
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88 }
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89
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90 /** Add a directory to the cache and check its parents.
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91 *
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92 * @param newDir
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93 */
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94 public void putDir(DocuDirectory newDir) {
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95 put(newDir);
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96 String parent = newDir.getParentDirName();
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97 if (parent != null) {
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98 // check the parent in the cache
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99 DocuDirectory pd = (DocuDirectory)map.get(parent);
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100 if (pd == null) {
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101 // the parent is unknown
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102 pd = new DocuDirectory(parent, this);
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103 putDir(pd);
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104 }
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105 newDir.setParent(pd);
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106 }
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107 }
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108
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109 /** Get a list with all children of a directory.
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110 *
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111 * Returns a List of DocuDirectory's.
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112 * Returns an empty List if the directory has no children.
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113 * If recurse is false then only direct children are returned.
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114 *
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115 * @param dirname
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116 * @param recurse find all children and their children.
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117 * @return
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118 */
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119 public List getChildren(String dirname, boolean recurse) {
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120 List l = new LinkedList();
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121 for (Iterator i = map.keySet().iterator(); i.hasNext(); ) {
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122 DocuDirectory dd = (DocuDirectory)i.next();
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123 if (recurse) {
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124 if (dd.getDirName().startsWith(dirname)) {
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125 l.add(dd);
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126 }
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127 } else {
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128 if (dd.getParentDirName().equals(dirname)) {
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129 l.add(dd);
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130 }
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131 }
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132 }
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133 return l;
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134 }
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135
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136 /** Returns the ImageFileset with the pathname <code>fn</code> and the
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137 * index <code>in</code> and the class <code>fc</code>.
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138 *
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139 * If <code>fn</code> is a file then the corresponding Fileset is
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140 * returned and the index is ignored.
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141 *
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142 * @param fn digilib pathname
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143 * @param in file index
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144 * @return
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145 */
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146 public DocuDirent getFile(String fn, int in, int fc) {
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147 DocuDirectory dd;
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148 // file number is 1-based, vector index is 0-based
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149 int n = in - 1;
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150 // first, assume fn is a directory and look in the cache
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151 dd = (DocuDirectory) map.get(fn);
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152 if (dd == null) {
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153 // cache miss
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154 misses++;
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155 // see if it's a directory
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156 File f = new File(baseDirNames[0], fn);
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157 if (f.isDirectory()) {
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158 dd = new DocuDirectory(fn, this);
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159 if (dd.isValid()) {
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160 // add to the cache
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161 putDir(dd);
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162 }
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163 } else {
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164 // maybe it's a file
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165 if (f.canRead()) {
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166 // get the parent directory string (like we store it in the cache)
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167 String d = fn.substring(0, fn.lastIndexOf("/"));
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168 // try it in the cache
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169 dd = (DocuDirectory) map.get(d);
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170 if (dd == null) {
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171 // try to read from disk
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172 dd = new DocuDirectory(d, this);
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173 if (dd.isValid()) {
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174 // add to the cache
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175 putDir(dd);
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176 } else {
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177 // invalid path
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178 return null;
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179 }
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180 } else {
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181 // then it was not a real cache miss
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182 misses--;
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183 }
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184 // get the file's index
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185 n = dd.indexOf(f.getName(), fc);
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186 } else {
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187 // it's not even a file :-(
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188 return null;
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189 }
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190 }
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191 } else {
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192 // cache hit
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193 hits++;
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194 }
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195 dd.refresh();
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196 if (dd.isValid()) {
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197 try {
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198 return dd.get(n, fc);
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199 } catch (ArrayIndexOutOfBoundsException e) {
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200 }
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201 }
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202 return null;
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203 }
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204
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205 /** Returns the DocuDirectory indicated by the pathname <code>fn</code>.
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206 *
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207 * If <code>fn</code> is a file then its parent directory is returned.
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208 *
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209 * @param fn digilib pathname
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210 * @return
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211 */
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212 public DocuDirectory getDirectory(String fn) {
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213 DocuDirectory dd;
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214 // first, assume fn is a directory and look in the cache
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215 dd = (DocuDirectory) map.get(fn);
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216 if (dd == null) {
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217 // cache miss
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218 misses++;
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219 // see if it's a directory
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220 File f = new File(baseDirNames[0], fn);
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221 if (f.isDirectory()) {
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222 dd = new DocuDirectory(fn, this);
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223 if (dd.isValid()) {
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224 // add to the cache
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225 putDir(dd);
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226 }
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227 } else {
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228 // maybe it's a file
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229 if (f.canRead()) {
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230 // try the parent directory in the cache
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231 dd = (DocuDirectory) map.get(f.getParent());
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232 if (dd == null) {
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233 // try to read from disk
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234 dd = new DocuDirectory(f.getParent(), this);
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235 if (dd.isValid()) {
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236 // add to the cache
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237 putDir(dd);
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238 } else {
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239 // invalid path
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240 return null;
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241 }
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242 } else {
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243 // not a real cache miss then
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244 misses--;
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245 }
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246 } else {
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247 // it's not even a file :-(
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248 return null;
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249 }
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250 }
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251 } else {
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252 // cache hit
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253 hits++;
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254 }
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255 dd.refresh();
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256 if (dd.isValid()) {
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257 return dd;
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258 }
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259 return null;
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260 }
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261
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262 /**
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263 * @return String[]
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264 */
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265 public String[] getBaseDirNames() {
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266 return baseDirNames;
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267 }
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268
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269 /**
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270 * @return long
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271 */
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272 public long getNumFiles() {
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273 return numFiles;
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274 }
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275
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276 /**
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277 * Sets the baseDirNames.
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278 * @param baseDirNames The baseDirNames to set
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279 */
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280 public void setBaseDirNames(String[] baseDirNames) {
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281 this.baseDirNames = baseDirNames;
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282 }
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283
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284 /**
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285 * @return long
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286 */
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287 public long getHits() {
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288 return hits;
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289 }
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290
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291 /**
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292 * @return long
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293 */
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294 public long getMisses() {
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295 return misses;
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296 }
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297
159
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298 /**
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299 * @return
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300 */
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301 public int[] getFileClasses() {
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302 return fileClasses;
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303 }
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304
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305 /**
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306 * @param fileClasses
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307 */
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308 public void setFileClasses(int[] fileClasses) {
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309 this.fileClasses = fileClasses;
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310 }
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311
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312 }