2 * Copyright (C) 2001, 2002 The Mir-coders group
4 * This file is part of Mir.
6 * Mir 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 2 of the License, or
9 * (at your option) any later version.
11 * Mir 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.
16 * You should have received a copy of the GNU General Public License
17 * along with Mir; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * In addition, as a special exception, The Mir-coders gives permission to link
21 * the code of this program with any library licensed under the Apache Software License,
22 * The Sun (tm) Java Advanced Imaging library (JAI), The Sun JIMI library
23 * (or with modified versions of the above that use the same license as the above),
24 * and distribute linked combinations including the two. You must obey the
25 * GNU General Public License in all respects for all of the code used other than
26 * the above mentioned libraries. If you modify this file, you may extend this
27 * exception to your version of the file, but you are not obligated to do so.
28 * If you do not wish to do so, delete this exception statement from your version.
33 import java.io.IOException;
36 * Class to do locking by way of a file:
37 * existence of the file means the lock is enabled.
39 public class LockFile {
43 * Creates an instance based on a filename
45 public LockFile(String aFileName) {
46 file = new File(aFileName);
49 public LockFile(File aFile) {
50 file = new File(aFile.getAbsolutePath());
54 * Tries to enable the lock. Returns <code>true</code> on success.
56 public boolean lock() throws IOException {
57 if (file.createNewFile()) {
67 * Returns <code>true</code> if locked, either by external parties
70 public boolean isLocked() {
75 * Removes the lock, wether it was enabled by this object or by
78 public void unlock() {