1   /**
2    * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
3    *
4    * This library is free software; you can redistribute it and/or modify it under
5    * the terms of the GNU Lesser General Public License as published by the Free
6    * Software Foundation; either version 2.1 of the License, or (at your option)
7    * any later version.
8    *
9    * This library is distributed in the hope that it will be useful, but WITHOUT
10   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
11   * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
12   * details.
13   */
14  
15  package com.liferay.portal.kernel.util;
16  
17  import com.liferay.portal.kernel.log.Log;
18  import com.liferay.portal.kernel.log.LogFactoryUtil;
19  
20  import java.lang.reflect.Method;
21  
22  /**
23   * <a href="InitialThreadLocal.java.html"><b><i>View Source</i></b></a>
24   *
25   * @author Brian Wing Shun Chan
26   * @author Shuyang Zhou
27   */
28  public class InitialThreadLocal<T> extends ThreadLocal<T> {
29  
30      public InitialThreadLocal(String name, T initialValue) {
31          _name = name;
32          _initialValue = initialValue;
33  
34          if (_initialValue instanceof Cloneable) {
35              try {
36                  _cloneMethod = _initialValue.getClass().getMethod(
37                      _METHOD_CLONE);
38              }
39              catch (Exception e) {
40                  _log.error(e, e);
41              }
42          }
43      }
44  
45      public String toString() {
46          if (_name != null) {
47              return _name;
48          }
49          else {
50              return super.toString();
51          }
52      }
53  
54      protected T initialValue() {
55          if (_cloneMethod != null) {
56              try {
57                  return (T)_cloneMethod.invoke(_initialValue);
58              }
59              catch (Exception e) {
60                  _log.error(e, e);
61              }
62          }
63  
64          return _initialValue;
65      }
66  
67      private static final String _METHOD_CLONE = "clone";
68  
69      private static Log _log = LogFactoryUtil.getLog(InitialThreadLocal.class);
70  
71      private Method _cloneMethod;
72      private T _initialValue;
73      private String _name;
74  
75  }