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Java > Open Source Codes > edu > rice > cs > drjava > ui > ClassPathFilter


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45
46 package edu.rice.cs.drjava.ui;
47
48 import java.io.File JavaDoc;
49 import javax.swing.filechooser.FileFilter JavaDoc;
50
51
52 /** A file filter for files with extensions ".jar"/".zip". Used in file choosers for extra classpath option.
53  * @version $Id: ClassPathFilter.java 3519 2006-02-08 05:49:40Z rcartwright $
54  */
55 public class ClassPathFilter extends FileFilter JavaDoc {
56   public static final ClassPathFilter ONLY = new ClassPathFilter();
57
58   protected ClassPathFilter() { }
59
60   /** Returns true if the file's extension matches JAR or ZIP. */
61   public boolean accept(File JavaDoc f) {
62     if (f.isDirectory()) return true;
63     String JavaDoc extension = getExtension(f);
64     if (extension != null) return (extension.equals("jar") || extension.equals("zip"));
65     return false;
66   }
67
68   /** @return A description of this filter to display. */
69   public String JavaDoc getDescription() { return "Classpath elements"; }
70
71   /* Get the extension of a file. */
72   public static String JavaDoc getExtension(File JavaDoc f) {
73     String JavaDoc ext = null;
74     String JavaDoc s = f.getName();
75     int i = s.lastIndexOf('.');
76     if (i > 0 && i < s.length() - 1) ext = s.substring(i + 1).toLowerCase();
77     return ext;
78   }
79 }
80
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