1 package org.codehaus.plexus.util.cli;
2
3 /*
4 * Copyright The Codehaus Foundation.
5 *
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18
19 import java.security.AccessControlException;
20
21 /**
22 * A shutdown hook that does not throw any exceptions upon container startup/shutdown or security manager
23 * restrictions.
24 *
25 * Incorrect usage of the hook itself may still throw an exception.
26 *
27 * @author Kristian Rosenvold
28 */
29 class ShutdownHookUtils
30 {
31
32 public static void addShutDownHook( Thread hook )
33 {
34 try
35 {
36 Runtime.getRuntime().addShutdownHook( hook );
37 }
38 catch ( IllegalStateException ignore )
39 {
40 }
41 catch ( AccessControlException ignore )
42 {
43 }
44
45
46 }
47
48 public static void removeShutdownHook( Thread hook )
49 {
50 try
51 {
52 Runtime.getRuntime().removeShutdownHook( hook );
53 }
54 catch ( IllegalStateException ignore )
55 {
56 }
57 catch ( AccessControlException ignore )
58 {
59 }
60 }
61
62 }