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(T initialValue) {
31          _initialValue = initialValue;
32  
33          if (_initialValue instanceof Cloneable) {
34              try {
35                  _cloneMethod = _initialValue.getClass().getMethod(
36                      _METHOD_CLONE);
37              }
38              catch (Exception e) {
39                  _log.error(e, e);
40              }
41          }
42      }
43  
44      protected T initialValue() {
45          if (_cloneMethod != null) {
46              try {
47                  return (T)_cloneMethod.invoke(_initialValue);
48              }
49              catch (Exception e) {
50                  _log.error(e, e);
51              }
52          }
53  
54          return _initialValue;
55      }
56  
57      private static final String _METHOD_CLONE = "clone";
58  
59      private static Log _log = LogFactoryUtil.getLog(InitialThreadLocal.class);
60  
61      private Method _cloneMethod;
62      private T _initialValue;
63  
64  }