01: /*
02: * IzPack - Copyright 2001-2008 Julien Ponge, All Rights Reserved.
03: *
04: * http://izpack.org/
05: * http://izpack.codehaus.org/
06: *
07: * Copyright 2005 Klaus Bartz
08: *
09: * Licensed under the Apache License, Version 2.0 (the "License");
10: * you may not use this file except in compliance with the License.
11: * You may obtain a copy of the License at
12: *
13: * http://www.apache.org/licenses/LICENSE-2.0
14: *
15: * Unless required by applicable law or agreed to in writing, software
16: * distributed under the License is distributed on an "AS IS" BASIS,
17: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18: * See the License for the specific language governing permissions and
19: * limitations under the License.
20: */
21:
22: package com.izforge.izpack.util.os;
23:
24: import com.izforge.izpack.util.TargetFactory;
25:
26: /**
27: * This class provides on windows a registry handler. All classes which needs registry access should
28: * be use only one handler.
29: *
30: * @author Klaus Bartz
31: *
32: */
33: public class RegistryDefaultHandler {
34:
35: private static RegistryHandler registryHandler = null;
36:
37: private static boolean initialized = false;
38:
39: /**
40: * Default constructor. No instance of this class should be created.
41: */
42: private RegistryDefaultHandler() {
43: super ();
44: }
45:
46: public synchronized static RegistryHandler getInstance() {
47: if (!initialized) {
48: try {
49: // Load the system dependant handler.
50: registryHandler = (RegistryHandler) (TargetFactory
51: .getInstance()
52: .makeObject("com.izforge.izpack.util.os.RegistryHandler"));
53: // Switch to the default handler to use one for complete logging.
54: registryHandler = registryHandler.getDefaultHandler();
55: } catch (Throwable exception) {
56: registryHandler = null; //
57: }
58: initialized = true;
59: }
60: if (registryHandler != null
61: && (!registryHandler.good() || !registryHandler
62: .doPerform()))
63: registryHandler = null;
64:
65: return (registryHandler);
66: }
67: }
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