1 /*
2 * Copyright (c) 2003-2008 by Cosylab d. d.
3 *
4 * This file is part of CosyBeans-Common.
5 *
6 * CosyBeans-Common is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
10 *
11 * CosyBeans-Common is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with CosyBeans-Common. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20 package com.cosylab.gui.components.customizer;
21
22 import java.io.File;
23
24 import javax.swing.JFileChooser;
25
26 /**
27 * <code>ImageFilter</code> is a file filter for common image files.
28 * This filter can be used by a {@link JFileChooser} and will filter out
29 * all but <i>png</i>, <i>jpg</i> and <i>jpeg</i> files.
30 *
31 */
32 public abstract class ImageFilter extends javax.swing.filechooser.FileFilter
33 {
34 /**
35 This is the one of the methods that is declared in
36 the abstract class
37 */
38 public boolean accept(File f)
39 {
40 //if it is a directory -- we want to show it so return true.
41 if (f.isDirectory())
42 return true;
43
44 //get the extension of the file
45
46 String extension = getExtension(f);
47 if ((extension.equals("png")) || (extension.equals("jpeg"))||
48 (extension.equals("jpg")))
49 return true;
50
51 //default -- fall through. False is return on all
52 //occasions except:
53 //a) the file is a directory
54 //b) the file's extension is what we are looking for.
55 return false;
56 }
57
58 /**
59 Again, this is declared in the abstract class
60
61 The description of this filter
62 */
63 public String getDescription()
64 {
65 return "Picture files";
66 }
67
68 /**
69 Method to get the extension of the file, in lowercase
70 */
71 protected String getExtension(File f)
72 {
73 String s = f.getName();
74 int i = s.lastIndexOf('.');
75 if (i > 0 && i < s.length() - 1)
76 return s.substring(i+1).toLowerCase();
77 return "";
78 }
79 }