ClassLoaderUtil


1   /*
2    * Copyright (c) 2002-2003 by OpenSymphony
3    * All rights reserved.
4    */
5   package com.opensymphony.oscache.util;
6   
7   
8   /**
9    * <p>This code is borrowed directly from OSCore, but is duplicated
10   * here to avoid having to add a dependency on the entire OSCore jar.</p>
11   *
12   * <p>If much more code from OSCore is needed then it might be wiser to
13   * bite the bullet and add a dependency.</p>
14   */
15  public class ClassLoaderUtil {
16      /**
17       * Load a class with a given name.
18       *
19       * It will try to load the class in the following order:
20       * <ul>
21       *  <li>From Thread.currentThread().getContextClassLoader()
22       *  <li>Using the basic Class.forName()
23       *  <li>From ClassLoaderUtil.class.getClassLoader()
24       *  <li>From the callingClass.getClassLoader()
25       * </ul>
26       *
27       * @param className The name of the class to load
28       * @param callingClass The Class object of the calling object
29       * @throws ClassNotFoundException If the class cannot be found anywhere.
30       */
31      public static Class   loadClass(String   className, Class   callingClass) throws ClassNotFoundException   {
32          try {
33              return Thread.currentThread().getContextClassLoader().loadClass(className);
34          } catch (ClassNotFoundException   e) {
35              try {
36                  return Class.forName(className);
37              } catch (ClassNotFoundException   ex) {
38                  try {
39                      return ClassLoaderUtil.class.getClassLoader().loadClass(className);
40                  } catch (ClassNotFoundException   exc) {
41                      return callingClass.getClassLoader().loadClass(className);
42                  }
43              }
44          }
45      }
46  }
47
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