1 //
2 // ========================================================================
3 // Copyright (c) 1995-2013 Mort Bay Consulting Pty. Ltd.
4 // ------------------------------------------------------------------------
5 // All rights reserved. This program and the accompanying materials
6 // are made available under the terms of the Eclipse Public License v1.0
7 // and Apache License v2.0 which accompanies this distribution.
8 //
9 // The Eclipse Public License is available at
10 // http://www.eclipse.org/legal/epl-v10.html
11 //
12 // The Apache License v2.0 is available at
13 // http://www.opensource.org/licenses/apache2.0.php
14 //
15 // You may elect to redistribute this code under either of these licenses.
16 // ========================================================================
17 //
18
19 package org.eclipse.jetty.start;
20
21 import java.io.File;
22 import java.text.CollationKey;
23 import java.text.Collator;
24 import java.util.Comparator;
25
26 /**
27 * Smart comparator for filenames, with natural language sorting, and files sorted before sub directories.
28 */
29 public class FilenameComparator implements Comparator<File>
30 {
31 public static final FilenameComparator INSTANCE = new FilenameComparator();
32 private Collator collator = Collator.getInstance();
33
34 public int compare(File o1, File o2)
35 {
36 if (o1.isFile())
37 {
38 if (o2.isFile())
39 {
40 CollationKey key1 = toKey(o1);
41 CollationKey key2 = toKey(o2);
42 return key1.compareTo(key2);
43 }
44 else
45 {
46 // Push o2 directories below o1 files
47 return -1;
48 }
49 }
50 else
51 {
52 if (o2.isDirectory())
53 {
54 CollationKey key1 = toKey(o1);
55 CollationKey key2 = toKey(o2);
56 return key1.compareTo(key2);
57 }
58 else
59 {
60 // Push o2 files above o1 directories
61 return 1;
62 }
63 }
64 }
65
66 private CollationKey toKey(File f)
67 {
68 return collator.getCollationKey(f.getAbsolutePath());
69 }
70 }