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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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91
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25 import java.util.HashMap;
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86
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26
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27 /**
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28 * @author casties
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29 */
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91
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30 public class DocuDirCache {
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31
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91
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32 // HashMap of directories
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33 private HashMap map = null;
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34 // names of base directories
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35 private String[] baseDirNames = null;
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36 // number of files in the whole cache (approximate)
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37 private long numFiles = 0;
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38 // number of cache hits
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39 private long hits = 0;
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40 // number of cache misses
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41 private long misses = 0;
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42
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43 /** Constructor with array of base directory names.
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44 *
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45 * @param bd base directory names
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46 */
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47 public DocuDirCache(String[] bd) {
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48 baseDirNames = bd;
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91
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49 map = new HashMap();
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50 }
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51
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52 /** The number of directories in the cache.
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53 * @return
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54 */
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55 public int size() {
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56 return (map != null) ? map.size() : 0;
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86
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57 }
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58
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59 /** Add a DocuDirectory to the cache.
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60 *
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61 * @param newdir
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62 */
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63 public void put(DocuDirectory newdir) {
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64 String s = newdir.getDirName();
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91
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65 if (map.containsKey(s)) {
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66 System.out.println("Baah, duplicate key in DocuDirectory.put!");
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67 } else {
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68 map.put(s, newdir);
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69 numFiles += newdir.size();
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70 }
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71 }
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72
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91
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73 /** Returns the DocuFileset with the pathname <code>fn</code> and the
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74 * index <code>in</code>.
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75 *
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76 * If <code>fn</code> is a file then the corresponding Fileset is
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77 * returned and the index is ignored.
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78 *
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79 * @param fn digilib pathname
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80 * @param in file index
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81 * @return
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82 */
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86
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83 public DocuFileset getFileset(String fn, int in) {
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84 DocuDirectory dd;
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85 // file number is 1-based, vector index is 0-based
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86 int n = in - 1;
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87 // first, assume fn is a directory and look in the cache
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88 dd = (DocuDirectory) map.get(fn);
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89 if (dd == null) {
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90 // cache miss
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91 misses++;
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92 // see if it's a directory
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93 File f = new File(baseDirNames[0] + fn);
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94 if (f.isDirectory()) {
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95 dd = new DocuDirectory(fn, baseDirNames);
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96 if (dd.isValid()) {
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97 // add to the cache
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98 put(dd);
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99 }
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100 } else {
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101 // maybe it's a file
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102 if (f.canRead()) {
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103 // get the parent directory
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104 String d = fn.substring(0, fn.lastIndexOf(File.separator));
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105 // try it in the cache
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106 dd = (DocuDirectory) map.get(d);
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107 if (dd == null) {
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108 // try to read from disk
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109 dd = new DocuDirectory(d, baseDirNames);
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110 if (dd.isValid()) {
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111 // add to the cache
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112 put(dd);
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113 } else {
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114 // invalid path
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115 return null;
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116 }
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117 } else {
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118 // not a real cache miss then
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119 misses--;
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120 }
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121 // get the file's index
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122 n = dd.indexOf(f.getName());
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123 }
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124 }
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125 } else {
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126 // cache hit
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127 hits++;
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128 }
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129 dd.refresh();
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130 if (dd.isValid()) {
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131 try {
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132 return dd.get(n);
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133 } catch (ArrayIndexOutOfBoundsException e) {
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134 }
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135 }
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136 return null;
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137 }
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138
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139 /** Returns the DocuDirectory indicated by the pathname <code>fn</code>.
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140 *
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141 * If <code>fn</code> is a file then its parent directory is returned.
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142 *
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143 * @param fn digilib pathname
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144 * @return
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145 */
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146 public DocuDirectory getDirectory(String fn) {
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147 DocuDirectory dd;
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148 // first, assume fn is a directory and look in the cache
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149 dd = (DocuDirectory) map.get(fn);
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150 if (dd == null) {
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151 // cache miss
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152 misses++;
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153 // see if it's a directory
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154 File f = new File(baseDirNames[0] + fn);
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155 if (f.isDirectory()) {
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156 dd = new DocuDirectory(fn, baseDirNames);
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157 if (dd.isValid()) {
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158 // add to the cache
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159 put(dd);
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160 }
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161 } else {
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162 // maybe it's a file
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163 if (f.canRead()) {
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164 // try the parent directory in the cache
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165 dd = (DocuDirectory) map.get(f.getParent());
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166 if (dd == null) {
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167 // try to read from disk
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168 dd = new DocuDirectory(f.getParent(), baseDirNames);
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169 if (dd.isValid()) {
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170 // add to the cache
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171 put(dd);
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172 } else {
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173 // invalid path
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174 return null;
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175 }
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91
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176 } else {
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177 // not a real cache miss then
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178 misses--;
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86
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179 }
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180 }
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181 }
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182 } else {
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183 // cache hit
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184 hits++;
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185 }
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186 dd.refresh();
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187 if (dd.isValid()) {
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188 return dd;
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189 }
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190 return null;
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191 }
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192
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193 /**
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194 * @return String[]
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195 */
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196 public String[] getBaseDirNames() {
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197 return baseDirNames;
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198 }
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199
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200 /**
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201 * @return long
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202 */
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203 public long getNumFiles() {
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204 return numFiles;
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205 }
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206
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207 /**
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208 * Sets the baseDirNames.
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209 * @param baseDirNames The baseDirNames to set
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210 */
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211 public void setBaseDirNames(String[] baseDirNames) {
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212 this.baseDirNames = baseDirNames;
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213 }
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214
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215 /**
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216 * @return long
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217 */
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218 public long getHits() {
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219 return hits;
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220 }
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221
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222 /**
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223 * @return long
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224 */
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225 public long getMisses() {
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226 return misses;
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227 }
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228
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229 }
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