Mercurial > hg > digilib-old
comparison servlet/src/digilib/io/DocuDirCache.java @ 86:997ba69afb81
New version 1.8b1.
With directory and file information cache.
With enhanceRGB method for color correction.
author | robcast |
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date | Sun, 09 Mar 2003 21:37:27 +0100 |
parents | |
children | a398fc09ba71 |
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85:4e6757e8ccd4 | 86:997ba69afb81 |
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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; | |
25 import java.util.Hashtable; | |
26 | |
27 /** | |
28 * @author casties | |
29 */ | |
30 public class DocuDirCache extends Hashtable { | |
31 | |
32 // names of base directories | |
33 private String[] baseDirNames = null; | |
34 // number of files in the whole cache (not reliable) | |
35 private long numFiles = 0; | |
36 // number of cache hits | |
37 private long hits = 0; | |
38 // number of cache misses | |
39 private long misses = 0; | |
40 | |
41 /* | |
42 * inherited constructors | |
43 */ | |
44 public DocuDirCache(int initialCapacity, float loadFactor) { | |
45 super(initialCapacity, loadFactor); | |
46 } | |
47 | |
48 public DocuDirCache(int initialCapacity) { | |
49 super(initialCapacity); | |
50 } | |
51 | |
52 public DocuDirCache() { | |
53 super(); | |
54 } | |
55 | |
56 /* | |
57 * new and exiting stuff | |
58 */ | |
59 | |
60 /** Constructor with array of base directory names. | |
61 * | |
62 * @param bd base directory names | |
63 */ | |
64 public DocuDirCache(String[] bd) { | |
65 super(); | |
66 baseDirNames = bd; | |
67 } | |
68 | |
69 /** Add a DocuDirectory to the cache. | |
70 * | |
71 * @param newdir | |
72 */ | |
73 public void put(DocuDirectory newdir) { | |
74 String s = newdir.getDirName(); | |
75 if (containsKey(s)) { | |
76 System.out.println("Baah, duplicate key in DocuDirectory.put!"); | |
77 } else { | |
78 super.put(s, newdir); | |
79 numFiles += newdir.size(); | |
80 } | |
81 } | |
82 | |
83 public DocuFileset getFileset(String fn, int in) { | |
84 DocuDirectory dd; | |
85 // file number is 1-based, vector index is 0-based | |
86 int n = in - 1; | |
87 // first, assume fn is a directory and look in the cache | |
88 dd = (DocuDirectory) get(fn); | |
89 if (dd == null) { | |
90 // cache miss | |
91 misses++; | |
92 // see if it's a directory | |
93 File f = new File(baseDirNames[0] + fn); | |
94 if (f.isDirectory()) { | |
95 dd = new DocuDirectory(fn, baseDirNames); | |
96 if (dd.isValid()) { | |
97 // add to the cache | |
98 put(dd); | |
99 } | |
100 } else { | |
101 // maybe it's a file | |
102 if (f.canRead()) { | |
103 // try the parent directory in the cache | |
104 dd = (DocuDirectory) get(f.getParent()); | |
105 if (dd == null) { | |
106 // try to read from disk | |
107 dd = new DocuDirectory(f.getParent(), baseDirNames); | |
108 if (dd.isValid()) { | |
109 // add to the cache | |
110 put(dd); | |
111 } else { | |
112 // invalid path | |
113 return null; | |
114 } | |
115 } | |
116 // get the file's index | |
117 n = dd.indexOf(f.getName()); | |
118 } | |
119 } | |
120 } else { | |
121 // cache hit | |
122 hits++; | |
123 } | |
124 dd.refresh(); | |
125 if (dd.isValid()) { | |
126 try { | |
127 return (DocuFileset) dd.elementAt(n); | |
128 } catch (ArrayIndexOutOfBoundsException e) { | |
129 } | |
130 } | |
131 return null; | |
132 } | |
133 | |
134 public DocuDirectory getDirectory(String fn) { | |
135 DocuDirectory dd; | |
136 // first, assume fn is a directory and look in the cache | |
137 dd = (DocuDirectory) get(fn); | |
138 if (dd == null) { | |
139 // cache miss | |
140 misses++; | |
141 // see if it's a directory | |
142 File f = new File(baseDirNames[0] + fn); | |
143 if (f.isDirectory()) { | |
144 dd = new DocuDirectory(fn, baseDirNames); | |
145 if (dd.isValid()) { | |
146 // add to the cache | |
147 put(dd); | |
148 } | |
149 } else { | |
150 // maybe it's a file | |
151 if (f.canRead()) { | |
152 // try the parent directory in the cache | |
153 dd = (DocuDirectory) get(f.getParent()); | |
154 if (dd == null) { | |
155 // try to read from disk | |
156 dd = new DocuDirectory(f.getParent(), baseDirNames); | |
157 if (dd.isValid()) { | |
158 // add to the cache | |
159 put(dd); | |
160 } else { | |
161 // invalid path | |
162 return null; | |
163 } | |
164 } | |
165 } | |
166 } | |
167 } else { | |
168 // cache hit | |
169 hits++; | |
170 } | |
171 dd.refresh(); | |
172 if (dd.isValid()) { | |
173 return dd; | |
174 } | |
175 return null; | |
176 } | |
177 | |
178 /** | |
179 * @return String[] | |
180 */ | |
181 public String[] getBaseDirNames() { | |
182 return baseDirNames; | |
183 } | |
184 | |
185 /** | |
186 * @return long | |
187 */ | |
188 public long getNumFiles() { | |
189 return numFiles; | |
190 } | |
191 | |
192 /** | |
193 * Sets the baseDirNames. | |
194 * @param baseDirNames The baseDirNames to set | |
195 */ | |
196 public void setBaseDirNames(String[] baseDirNames) { | |
197 this.baseDirNames = baseDirNames; | |
198 } | |
199 | |
200 /** | |
201 * @return long | |
202 */ | |
203 public long getHits() { | |
204 return hits; | |
205 } | |
206 | |
207 /** | |
208 * @return long | |
209 */ | |
210 public long getMisses() { | |
211 return misses; | |
212 } | |
213 | |
214 } |