Mercurial > hg > digilib-old
annotate servlet/src/digilib/io/DocuDirCache.java @ 152:f4a5cfe37469
Servlet version 1.16a1
- cleanup of DigilibConfig class
- now uses new Parameter and ParameterMap classes
- new parameter default-quality
author | robcast |
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date | Wed, 03 Sep 2003 00:54:38 +0200 |
parents | bc8df0133c04 |
children | e743b853efca |
rev | line source |
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86 | 1 /* DocuDirCache.java |
2 | |
3 Digital Image Library servlet components | |
4 | |
5 Copyright (C) 2003 Robert Casties (robcast@mail.berlios.de) | |
6 | |
7 This program is free software; you can redistribute it and/or modify it | |
8 under the terms of the GNU General Public License as published by the | |
9 Free Software Foundation; either version 2 of the License, or (at your | |
10 option) any later version. | |
11 | |
12 Please read license.txt for the full details. A copy of the GPL | |
13 may be found at http://www.gnu.org/copyleft/lgpl.html | |
14 | |
15 You should have received a copy of the GNU General Public License | |
16 along with this program; if not, write to the Free Software | |
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | |
19 * Created on 03.03.2003 | |
20 */ | |
21 | |
22 package digilib.io; | |
23 | |
24 import java.io.File; | |
91 | 25 import java.util.HashMap; |
86 | 26 |
27 /** | |
28 * @author casties | |
29 */ | |
91 | 30 public class DocuDirCache { |
86 | 31 |
91 | 32 // HashMap of directories |
33 private HashMap map = null; | |
86 | 34 // names of base directories |
35 private String[] baseDirNames = null; | |
91 | 36 // number of files in the whole cache (approximate) |
86 | 37 private long numFiles = 0; |
38 // number of cache hits | |
39 private long hits = 0; | |
40 // number of cache misses | |
41 private long misses = 0; | |
42 | |
43 /** Constructor with array of base directory names. | |
44 * | |
45 * @param bd base directory names | |
46 */ | |
47 public DocuDirCache(String[] bd) { | |
48 baseDirNames = bd; | |
91 | 49 map = new HashMap(); |
50 } | |
51 | |
52 /** The number of directories in the cache. | |
53 * @return | |
54 */ | |
55 public int size() { | |
56 return (map != null) ? map.size() : 0; | |
86 | 57 } |
58 | |
59 /** Add a DocuDirectory to the cache. | |
60 * | |
61 * @param newdir | |
62 */ | |
63 public void put(DocuDirectory newdir) { | |
64 String s = newdir.getDirName(); | |
91 | 65 if (map.containsKey(s)) { |
86 | 66 System.out.println("Baah, duplicate key in DocuDirectory.put!"); |
67 } else { | |
91 | 68 map.put(s, newdir); |
86 | 69 numFiles += newdir.size(); |
70 } | |
71 } | |
72 | |
151 | 73 /** Add a directory to the cache and check its parents. |
74 * | |
75 * @param newDir | |
76 */ | |
77 public void putDir(DocuDirectory newDir) { | |
78 put(newDir); | |
79 String parent = newDir.getParentDirName(); | |
80 if (parent != null) { | |
81 // check the parent in the cache | |
82 DocuDirectory pd = (DocuDirectory)map.get(parent); | |
83 if (pd == null) { | |
84 // the parent is unknown | |
85 pd = new DocuDirectory(parent, this); | |
86 putDir(pd); | |
87 } | |
88 newDir.setParent(pd); | |
89 } | |
90 // update dir in the end | |
91 newDir.readParentMeta(); | |
92 } | |
93 | |
91 | 94 /** Returns the DocuFileset with the pathname <code>fn</code> and the |
95 * index <code>in</code>. | |
96 * | |
97 * If <code>fn</code> is a file then the corresponding Fileset is | |
98 * returned and the index is ignored. | |
99 * | |
100 * @param fn digilib pathname | |
101 * @param in file index | |
102 * @return | |
103 */ | |
86 | 104 public DocuFileset getFileset(String fn, int in) { |
105 DocuDirectory dd; | |
106 // file number is 1-based, vector index is 0-based | |
107 int n = in - 1; | |
108 // first, assume fn is a directory and look in the cache | |
91 | 109 dd = (DocuDirectory) map.get(fn); |
110 if (dd == null) { | |
111 // cache miss | |
112 misses++; | |
113 // see if it's a directory | |
152 | 114 File f = new File(baseDirNames[0], fn); |
91 | 115 if (f.isDirectory()) { |
151 | 116 dd = new DocuDirectory(fn, this); |
91 | 117 if (dd.isValid()) { |
118 // add to the cache | |
151 | 119 putDir(dd); |
91 | 120 } |
121 } else { | |
122 // maybe it's a file | |
123 if (f.canRead()) { | |
116 | 124 // get the parent directory string (like we store it in the cache) |
125 String d = fn.substring(0, fn.lastIndexOf("/")); | |
91 | 126 // try it in the cache |
127 dd = (DocuDirectory) map.get(d); | |
128 if (dd == null) { | |
129 // try to read from disk | |
151 | 130 dd = new DocuDirectory(d, this); |
91 | 131 if (dd.isValid()) { |
132 // add to the cache | |
151 | 133 putDir(dd); |
91 | 134 } else { |
135 // invalid path | |
136 return null; | |
137 } | |
138 } else { | |
99
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139 // then it was not a real cache miss |
91 | 140 misses--; |
141 } | |
142 // get the file's index | |
143 n = dd.indexOf(f.getName()); | |
99
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144 } else { |
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145 // it's not even a file :-( |
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146 return null; |
91 | 147 } |
148 } | |
149 } else { | |
150 // cache hit | |
151 hits++; | |
152 } | |
153 dd.refresh(); | |
154 if (dd.isValid()) { | |
155 try { | |
156 return dd.get(n); | |
157 } catch (ArrayIndexOutOfBoundsException e) { | |
158 } | |
159 } | |
160 return null; | |
161 } | |
162 | |
163 /** Returns the DocuDirectory indicated by the pathname <code>fn</code>. | |
164 * | |
165 * If <code>fn</code> is a file then its parent directory is returned. | |
166 * | |
167 * @param fn digilib pathname | |
168 * @return | |
169 */ | |
170 public DocuDirectory getDirectory(String fn) { | |
171 DocuDirectory dd; | |
172 // first, assume fn is a directory and look in the cache | |
173 dd = (DocuDirectory) map.get(fn); | |
86 | 174 if (dd == null) { |
175 // cache miss | |
176 misses++; | |
177 // see if it's a directory | |
152 | 178 File f = new File(baseDirNames[0], fn); |
86 | 179 if (f.isDirectory()) { |
151 | 180 dd = new DocuDirectory(fn, this); |
86 | 181 if (dd.isValid()) { |
182 // add to the cache | |
151 | 183 putDir(dd); |
86 | 184 } |
185 } else { | |
186 // maybe it's a file | |
187 if (f.canRead()) { | |
188 // try the parent directory in the cache | |
91 | 189 dd = (DocuDirectory) map.get(f.getParent()); |
86 | 190 if (dd == null) { |
191 // try to read from disk | |
151 | 192 dd = new DocuDirectory(f.getParent(), this); |
86 | 193 if (dd.isValid()) { |
194 // add to the cache | |
151 | 195 putDir(dd); |
86 | 196 } else { |
197 // invalid path | |
198 return null; | |
199 } | |
91 | 200 } else { |
201 // not a real cache miss then | |
202 misses--; | |
86 | 203 } |
99
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204 } else { |
226624784fe3
Small bug lead to null pointer exception when directory doesn't exist.
robcast
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diff
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205 // it's not even a file :-( |
226624784fe3
Small bug lead to null pointer exception when directory doesn't exist.
robcast
parents:
91
diff
changeset
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206 return null; |
86 | 207 } |
208 } | |
209 } else { | |
210 // cache hit | |
211 hits++; | |
212 } | |
213 dd.refresh(); | |
214 if (dd.isValid()) { | |
215 return dd; | |
216 } | |
217 return null; | |
218 } | |
219 | |
220 /** | |
221 * @return String[] | |
222 */ | |
223 public String[] getBaseDirNames() { | |
224 return baseDirNames; | |
225 } | |
226 | |
227 /** | |
228 * @return long | |
229 */ | |
230 public long getNumFiles() { | |
231 return numFiles; | |
232 } | |
233 | |
234 /** | |
235 * Sets the baseDirNames. | |
236 * @param baseDirNames The baseDirNames to set | |
237 */ | |
238 public void setBaseDirNames(String[] baseDirNames) { | |
239 this.baseDirNames = baseDirNames; | |
240 } | |
241 | |
242 /** | |
243 * @return long | |
244 */ | |
245 public long getHits() { | |
246 return hits; | |
247 } | |
248 | |
249 /** | |
250 * @return long | |
251 */ | |
252 public long getMisses() { | |
253 return misses; | |
254 } | |
255 | |
256 } |