1 /*
2 * Copyright (C) 2005-2015 Schlichtherle IT Services.
3 * All rights reserved. Use is subject to license terms.
4 */
5 package net.java.truevfs.kernel.spec;
6
7 import java.io.Serializable;
8 import java.util.Comparator;
9
10 /**
11 * Compares {@linkplain FsController file system controllers} in reverse order
12 * of the
13 * {@linkplain FsMountPoint#toHierarchicalUri() hierarchical URI}
14 * of the {@linkplain FsModel#getMountPoint() mount point} of their
15 * {@linkplain FsController#getModel() file system model}.
16 * When applied to a list of file system controllers for
17 * {@linkplain FsController#sync sync()}ing, this ordering ensures that any
18 * archive file system gets {@code sync()}ed before their parent file system so
19 * that all file systems reflect all changes once the list has been completely
20 * processed.
21 *
22 * @author Christian Schlichtherle
23 */
24 public class FsControllerComparator
25 implements Comparator<FsController>, Serializable {
26
27 private static final long serialVersionUID = 0L;
28
29 @Override
30 public int compare(FsController o1, FsController o2) {
31 return o2.getModel().getMountPoint().toHierarchicalUri().compareTo(
32 o1.getModel().getMountPoint().toHierarchicalUri());
33 }
34 }