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.Cloneable;
21  import java.lang.reflect.Method;
22  
23  /**
24   * <a href="InitialThreadLocal.java.html"><b><i>View Source</i></b></a>
25   *
26   * @author Brian Wing Shun Chan
27   */
28  public class InitialThreadLocal<T> extends ThreadLocal<T> {
29  
30      public InitialThreadLocal(T initialValue) {
31          _initialValue = initialValue;
32      }
33  
34      protected T initialValue() {
35          if (_initialValue instanceof Cloneable) {
36              try {
37                  Method method = _initialValue.getClass().getMethod(
38                      _METHOD_CLONE);
39  
40                  return (T)method.invoke(_initialValue);
41              }
42              catch (Exception e) {
43                  _log.error(e, e);
44              }
45          }
46  
47          return _initialValue;
48      }
49  
50      private static final String _METHOD_CLONE = "clone";
51  
52      private static Log _log = LogFactoryUtil.getLog(InitialThreadLocal.class);
53  
54      private T _initialValue;
55  
56  }