1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    * Permission is hereby granted, free of charge, to any person obtaining a copy
5    * of this software and associated documentation files (the "Software"), to deal
6    * in the Software without restriction, including without limitation the rights
7    * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8    * copies of the Software, and to permit persons to whom the Software is
9    * furnished to do so, subject to the following conditions:
10   *
11   * The above copyright notice and this permission notice shall be included in
12   * all copies or substantial portions of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.portal.kernel.util;
24  
25  import com.liferay.portal.kernel.log.Log;
26  import com.liferay.portal.kernel.log.LogFactoryUtil;
27  
28  import java.lang.Cloneable;
29  import java.lang.reflect.Method;
30  
31  /**
32   * <a href="InitialThreadLocal.java.html"><b><i>View Source</i></b></a>
33   *
34   * @author Brian Wing Shun Chan
35   *
36   */
37  public class InitialThreadLocal<T> extends ThreadLocal<T> {
38  
39      public InitialThreadLocal(T initialValue) {
40          _initialValue = initialValue;
41      }
42  
43      protected T initialValue() {
44          if (_initialValue instanceof Cloneable) {
45              try {
46                  Method method = _initialValue.getClass().getMethod(
47                      _METHOD_CLONE);
48  
49                  return (T)method.invoke(_initialValue);
50              }
51              catch (Exception e) {
52                  _log.error(e, e);
53              }
54          }
55  
56          return _initialValue;
57      }
58  
59      private static final String _METHOD_CLONE = "clone";
60  
61      private static Log _log = LogFactoryUtil.getLog(InitialThreadLocal.class);
62  
63      private T _initialValue;
64  
65  }