Mercurial > hg > digilib-old
annotate servlet/src/digilib/io/FileOps.java @ 56:2ea78a56ecf8
Use system specific pathSeparator for documents paths (; on Win).
Fix Error accessing files when only one document path was specified.
(ROC)
| author | robcast |
|---|---|
| date | Tue, 27 Aug 2002 12:29:07 +0200 |
| parents | 0ff3ede32060 |
| children | 5ea1999befd4 |
| rev | line source |
|---|---|
| 1 | 1 /* FileOps -- Utility class for file operations |
| 2 | |
| 3 Digital Image Library servlet components | |
| 4 | |
| 5 Copyright (C) 2001, 2002 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 */ | |
| 20 | |
| 21 package digilib.io; | |
| 22 | |
| 23 import java.io.*; | |
| 24 import java.util.*; | |
| 25 | |
| 26 import digilib.*; | |
| 27 | |
| 28 | |
| 29 public class FileOps { | |
| 30 | |
| 31 private Utils util = null; | |
| 32 public static String[] fileTypes = { | |
| 33 "jpg", "image/jpeg", | |
| 34 "jpeg", "image/jpeg", | |
| 35 "png", "image/png", | |
| 36 "gif", "image/gif", | |
| 37 "tif", "image/tiff", | |
| 38 "tiff", "image/tiff"}; | |
| 39 | |
| 40 public FileOps() { | |
| 41 util = new Utils(); | |
| 42 } | |
| 43 | |
| 44 public FileOps(Utils u) { | |
| 45 util = u; | |
| 46 } | |
| 47 | |
| 48 public void setUtils(Utils u) { | |
| 49 util = u; | |
| 50 } | |
| 51 | |
| 52 | |
| 53 /** | |
| 54 * get the mime type for a file format (by extension) | |
| 55 */ | |
| 56 public static String mimeForFile(File f) { | |
| 57 String fn = f.getName(); | |
| 58 for (int i = 0; i < fileTypes.length; i += 2) { | |
| 59 if (fn.toLowerCase().endsWith(fileTypes[i])) { | |
| 60 return fileTypes[i+1]; | |
| 61 } | |
| 62 } | |
| 63 return null; | |
| 64 } | |
| 65 | |
| 66 /** | |
| 67 * get a filehandle for a file or directory name | |
| 68 * returns File number n if fn is directory (starts with 1) | |
| 69 */ | |
| 70 public File getFile(String fn, int n) throws FileOpException { | |
| 71 util.dprintln(4, "getFile ("+fn+", "+n+")"); | |
| 72 | |
| 73 File f = new File(fn); | |
| 74 // if fn is a file name then return file | |
| 75 if (f.isFile()) { | |
| 76 return f; | |
| 77 } | |
| 78 // if fn is a directory name then open directory | |
| 79 if (f.isDirectory()) { | |
| 80 File[] fl = f.listFiles(new ImgFileFilter()); | |
| 81 Arrays.sort(fl); | |
| 82 if ((n > 0) && (n <= fl.length)) { | |
| 83 return fl[n - 1]; | |
| 84 } | |
| 85 } | |
| 86 throw new FileOpException("Unable to find file: "+fn); | |
| 87 } | |
| 88 | |
| 89 /** | |
| 90 * get the number of files in a directory | |
| 91 * (almost the same as getFile) | |
| 92 * returns 0 in case of problems | |
| 93 */ | |
| 94 public int getNumFiles(String fn) throws FileOpException { | |
| 95 util.dprintln(4, "getNumFiles ("+fn+")"); | |
| 96 | |
| 97 File f = new File(fn); | |
| 98 // if fn is a file name then return 1 | |
| 99 if (f.isFile()) { | |
| 100 return 1; | |
| 101 } | |
| 102 // if fn is a directory name then return the number of files | |
| 103 if (f.isDirectory()) { | |
| 104 return f.listFiles(new ImgFileFilter()).length; | |
| 105 } | |
| 106 // then fn must be something strange... | |
| 107 return 0; | |
| 108 } | |
| 109 | |
| 110 | |
| 111 /** | |
| 112 * get a filehandle for a file or directory name out of a list | |
| 113 * dirs is a list of base directories, fn is the appended file/dirname | |
| 114 * searches dirs until fn exists (backwards if fwd is false) | |
| 115 * returns File number n if fn is directory (starts with 1) | |
| 116 */ | |
| 117 public File getFileVariant(String[] dirs, String fn, int n, boolean fwd) throws FileOpException { | |
| 118 util.dprintln(4, "getVariantFile ("+dirs+", "+fn+", "+n+")"); | |
| 119 | |
| 120 File f = null; | |
|
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robcast
parents:
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changeset
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121 int nvar = dirs.length; |
| 1 | 122 |
|
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Use system specific pathSeparator for documents paths (; on Win).
robcast
parents:
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changeset
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123 for (int i = 0; i < nvar; i++) { |
| 1 | 124 try { |
|
56
2ea78a56ecf8
Use system specific pathSeparator for documents paths (; on Win).
robcast
parents:
1
diff
changeset
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125 f = getFile(dirs[(fwd) ? i : (nvar-i-1)]+fn, n); |
| 1 | 126 } catch (FileOpException e) { |
| 127 f = null; | |
| 128 } | |
| 129 if (f != null) { | |
| 130 return f; | |
| 131 } | |
| 132 } | |
| 133 throw new FileOpException("Unable to find file: "+fn); | |
| 134 } | |
| 135 | |
| 136 /** | |
| 137 * get the number of files in a directory | |
| 138 * (almost the same as getFileVariant) | |
| 139 * returns 0 in case of problems | |
| 140 */ | |
| 141 public int getNumFilesVariant(String[] dirs, String fn, boolean fwd) throws FileOpException { | |
| 142 util.dprintln(4, "getNumFilesVariant ("+dirs+", "+fn+")"); | |
| 143 | |
| 144 int nf = 0; | |
|
56
2ea78a56ecf8
Use system specific pathSeparator for documents paths (; on Win).
robcast
parents:
1
diff
changeset
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145 int nvar = dirs.length; |
| 1 | 146 |
|
56
2ea78a56ecf8
Use system specific pathSeparator for documents paths (; on Win).
robcast
parents:
1
diff
changeset
|
147 for (int i = 0; i < nvar; i++) { |
| 1 | 148 try { |
|
56
2ea78a56ecf8
Use system specific pathSeparator for documents paths (; on Win).
robcast
parents:
1
diff
changeset
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149 nf = getNumFiles(dirs[(fwd) ? i : (nvar-i-1)]+fn); |
| 1 | 150 } catch (FileOpException e) { |
| 151 nf = 0; | |
| 152 } | |
| 153 if (nf > 0) { | |
| 154 return nf; | |
| 155 } | |
| 156 } | |
| 157 return 0; | |
| 158 } | |
| 159 | |
| 160 /** | |
| 161 * FileFilter for image types (helper class for getFile) | |
| 162 */ | |
| 163 private class ImgFileFilter implements FileFilter { | |
| 164 | |
| 165 public boolean accept(File f) { | |
| 166 if (f.isFile()) { | |
| 167 return (mimeForFile(f) != null); | |
| 168 } else { | |
| 169 return false; | |
| 170 } | |
| 171 } | |
| 172 } | |
| 173 | |
| 174 } |