Mercurial > hg > digilib-old
annotate servlet/src/digilib/io/FileOps.java @ 86:997ba69afb81
New version 1.8b1.
With directory and file information cache.
With enhanceRGB method for color correction.
| author | robcast |
|---|---|
| date | Sun, 09 Mar 2003 21:37:27 +0100 |
| parents | 4e6757e8ccd4 |
| children | a398fc09ba71 |
| rev | line source |
|---|---|
| 85 | 1 /* FileOps -- Utility class for file operations |
| 1 | 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", | |
|
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35 "jp2", "image/jp2", |
| 1 | 36 "png", "image/png", |
| 37 "gif", "image/gif", | |
| 38 "tif", "image/tiff", | |
| 39 "tiff", "image/tiff"}; | |
| 40 | |
| 41 public FileOps() { | |
| 42 util = new Utils(); | |
| 43 } | |
| 44 | |
| 45 public FileOps(Utils u) { | |
| 46 util = u; | |
| 47 } | |
| 48 | |
| 49 public void setUtils(Utils u) { | |
| 50 util = u; | |
| 51 } | |
| 52 | |
| 53 | |
| 54 /** | |
| 55 * get the mime type for a file format (by extension) | |
| 56 */ | |
| 57 public static String mimeForFile(File f) { | |
| 58 String fn = f.getName(); | |
| 59 for (int i = 0; i < fileTypes.length; i += 2) { | |
| 60 if (fn.toLowerCase().endsWith(fileTypes[i])) { | |
| 61 return fileTypes[i+1]; | |
| 62 } | |
| 63 } | |
| 64 return null; | |
| 65 } | |
| 66 | |
| 67 /** | |
| 68 * get a filehandle for a file or directory name | |
| 69 * returns File number n if fn is directory (starts with 1) | |
| 70 */ | |
| 71 public File getFile(String fn, int n) throws FileOpException { | |
| 72 util.dprintln(4, "getFile ("+fn+", "+n+")"); | |
| 73 | |
| 74 File f = new File(fn); | |
| 75 // if fn is a file name then return file | |
| 76 if (f.isFile()) { | |
| 77 return f; | |
| 78 } | |
| 79 // if fn is a directory name then open directory | |
| 80 if (f.isDirectory()) { | |
| 86 | 81 File[] fl = f.listFiles(new ImageFileFilter()); |
| 1 | 82 Arrays.sort(fl); |
| 83 if ((n > 0) && (n <= fl.length)) { | |
| 84 return fl[n - 1]; | |
| 85 } | |
| 86 } | |
| 87 throw new FileOpException("Unable to find file: "+fn); | |
| 88 } | |
| 89 | |
| 90 /** | |
| 91 * get the number of files in a directory | |
| 92 * (almost the same as getFile) | |
| 93 * returns 0 in case of problems | |
| 94 */ | |
| 95 public int getNumFiles(String fn) throws FileOpException { | |
| 96 util.dprintln(4, "getNumFiles ("+fn+")"); | |
| 97 | |
| 98 File f = new File(fn); | |
| 99 // if fn is a file name then return 1 | |
| 100 if (f.isFile()) { | |
| 101 return 1; | |
| 102 } | |
| 103 // if fn is a directory name then return the number of files | |
| 104 if (f.isDirectory()) { | |
| 86 | 105 return f.listFiles(new ImageFileFilter()).length; |
| 1 | 106 } |
| 107 // then fn must be something strange... | |
| 108 return 0; | |
| 109 } | |
| 110 | |
| 111 | |
| 112 /** | |
| 113 * get a filehandle for a file or directory name out of a list | |
| 114 * dirs is a list of base directories, fn is the appended file/dirname | |
| 115 * searches dirs until fn exists (backwards if fwd is false) | |
| 116 * returns File number n if fn is directory (starts with 1) | |
| 117 */ | |
| 118 public File getFileVariant(String[] dirs, String fn, int n, boolean fwd) throws FileOpException { | |
| 119 util.dprintln(4, "getVariantFile ("+dirs+", "+fn+", "+n+")"); | |
| 120 | |
| 121 File f = null; | |
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122 int nvar = dirs.length; |
| 1 | 123 |
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124 for (int i = 0; i < nvar; i++) { |
| 1 | 125 try { |
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126 f = getFile(dirs[(fwd) ? i : (nvar-i-1)]+fn, n); |
| 1 | 127 } catch (FileOpException e) { |
| 128 f = null; | |
| 129 } | |
| 130 if (f != null) { | |
| 131 return f; | |
| 132 } | |
| 133 } | |
| 134 throw new FileOpException("Unable to find file: "+fn); | |
| 135 } | |
| 136 | |
| 137 /** | |
| 138 * get the number of files in a directory | |
| 139 * (almost the same as getFileVariant) | |
| 140 * returns 0 in case of problems | |
| 141 */ | |
| 142 public int getNumFilesVariant(String[] dirs, String fn, boolean fwd) throws FileOpException { | |
| 143 util.dprintln(4, "getNumFilesVariant ("+dirs+", "+fn+")"); | |
| 144 | |
| 145 int nf = 0; | |
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146 int nvar = dirs.length; |
| 1 | 147 |
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148 for (int i = 0; i < nvar; i++) { |
| 1 | 149 try { |
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150 nf = getNumFiles(dirs[(fwd) ? i : (nvar-i-1)]+fn); |
| 1 | 151 } catch (FileOpException e) { |
| 152 nf = 0; | |
| 153 } | |
| 154 if (nf > 0) { | |
| 155 return nf; | |
| 156 } | |
| 157 } | |
| 158 return 0; | |
| 159 } | |
| 160 | |
| 161 /** | |
| 162 * FileFilter for image types (helper class for getFile) | |
| 163 */ | |
| 86 | 164 static class ImageFileFilter implements FileFilter { |
| 1 | 165 |
| 166 public boolean accept(File f) { | |
| 167 if (f.isFile()) { | |
| 168 return (mimeForFile(f) != null); | |
| 169 } else { | |
| 170 return false; | |
| 171 } | |
| 172 } | |
| 173 } | |
| 174 | |
| 175 } |