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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.Hashtable;
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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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30 public class DocuDirCache extends Hashtable {
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31
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32 // names of base directories
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33 private String[] baseDirNames = null;
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34 // number of files in the whole cache (not reliable)
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35 private long numFiles = 0;
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36 // number of cache hits
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37 private long hits = 0;
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38 // number of cache misses
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39 private long misses = 0;
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40
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41 /*
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42 * inherited constructors
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43 */
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44 public DocuDirCache(int initialCapacity, float loadFactor) {
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45 super(initialCapacity, loadFactor);
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46 }
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47
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48 public DocuDirCache(int initialCapacity) {
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49 super(initialCapacity);
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50 }
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51
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52 public DocuDirCache() {
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53 super();
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54 }
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55
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56 /*
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57 * new and exiting stuff
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58 */
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59
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60 /** Constructor with array of base directory names.
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61 *
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62 * @param bd base directory names
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63 */
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64 public DocuDirCache(String[] bd) {
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65 super();
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66 baseDirNames = bd;
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67 }
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68
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69 /** Add a DocuDirectory to the cache.
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70 *
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71 * @param newdir
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72 */
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73 public void put(DocuDirectory newdir) {
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74 String s = newdir.getDirName();
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75 if (containsKey(s)) {
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76 System.out.println("Baah, duplicate key in DocuDirectory.put!");
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77 } else {
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78 super.put(s, newdir);
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79 numFiles += newdir.size();
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80 }
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81 }
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82
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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) 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 // try the parent directory in the cache
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104 dd = (DocuDirectory) get(f.getParent());
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105 if (dd == null) {
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106 // try to read from disk
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107 dd = new DocuDirectory(f.getParent(), baseDirNames);
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108 if (dd.isValid()) {
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109 // add to the cache
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110 put(dd);
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111 } else {
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112 // invalid path
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113 return null;
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114 }
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115 }
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116 // get the file's index
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117 n = dd.indexOf(f.getName());
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118 }
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119 }
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120 } else {
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121 // cache hit
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122 hits++;
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123 }
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124 dd.refresh();
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125 if (dd.isValid()) {
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126 try {
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127 return (DocuFileset) dd.elementAt(n);
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128 } catch (ArrayIndexOutOfBoundsException e) {
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129 }
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130 }
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131 return null;
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132 }
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133
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134 public DocuDirectory getDirectory(String fn) {
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135 DocuDirectory dd;
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136 // first, assume fn is a directory and look in the cache
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137 dd = (DocuDirectory) get(fn);
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138 if (dd == null) {
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139 // cache miss
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140 misses++;
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141 // see if it's a directory
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142 File f = new File(baseDirNames[0] + fn);
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143 if (f.isDirectory()) {
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144 dd = new DocuDirectory(fn, baseDirNames);
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145 if (dd.isValid()) {
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146 // add to the cache
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147 put(dd);
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148 }
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149 } else {
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150 // maybe it's a file
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151 if (f.canRead()) {
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152 // try the parent directory in the cache
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153 dd = (DocuDirectory) get(f.getParent());
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154 if (dd == null) {
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155 // try to read from disk
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156 dd = new DocuDirectory(f.getParent(), 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 } else {
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161 // invalid path
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162 return null;
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163 }
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164 }
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165 }
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166 }
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167 } else {
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168 // cache hit
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169 hits++;
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170 }
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171 dd.refresh();
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172 if (dd.isValid()) {
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173 return dd;
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174 }
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175 return null;
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176 }
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177
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178 /**
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179 * @return String[]
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180 */
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181 public String[] getBaseDirNames() {
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182 return baseDirNames;
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183 }
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184
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185 /**
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186 * @return long
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187 */
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188 public long getNumFiles() {
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189 return numFiles;
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190 }
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191
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192 /**
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193 * Sets the baseDirNames.
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194 * @param baseDirNames The baseDirNames to set
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195 */
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196 public void setBaseDirNames(String[] baseDirNames) {
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197 this.baseDirNames = 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 getHits() {
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204 return hits;
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205 }
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206
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207 /**
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208 * @return long
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209 */
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210 public long getMisses() {
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211 return misses;
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212 }
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213
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214 }
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