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  /*
  * JBoss, Home of Professional Open Source
  * Copyright 2005, JBoss Inc., and individual contributors as indicated
  * by the @authors tag. See the copyright.txt in the distribution for a
  * full listing of individual contributors.
  *
  * This is free software; you can redistribute it and/or modify it
  * under the terms of the GNU Lesser General Public License as
  * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
 package org.jboss.remoting.serialization;
 

Author(s):
Clebert Suconic
 
 public class ClassLoaderUtility
 {

   
Tries to load the class from the current thread's context class loader. If not successful, tries to load the class from the current instance.

Parameters:
classname Desired class.
clazz Class object used to obtain a class loader if no context class loader is available.
Returns:
Class, or null on failure.
 
    public static Class loadClass(String classnamefinal Class clazzthrows ClassNotFoundException
    {
       ClassLoader loader;
 
       try
       {
          loader = (ClassLoader) AccessController.doPrivilegednew PrivilegedAction()
          {
             public Object run()
             {
                return Thread.currentThread().getContextClassLoader();
             }
          });
          if (loader != null)
          {
             return Class.forName(classnamefalseloader);
          }
       }
       catch (Throwable t)
       {
       }
 
       if (clazz != null)
       {
          try
          {
             loader = (ClassLoader) AccessController.doPrivilegednew PrivilegedAction()
             {
                public Object run()
                {
                   return clazz.getClassLoader();
                }
             });
             if (loader != null)
             {
                return Class.forName(classnamefalseloader);
             }
          }
          catch (Throwable t)
          {
          }
       }
 
       try
       {
          loader = (ClassLoader) AccessController.doPrivilegednew PrivilegedAction()
          {
             public Object run()
             {
                return ClassLoader.getSystemClassLoader();
             }
          });
          if (loader != null)
          {
             return Class.forName(classnamefalseloader);
          }
       }
       catch (Throwable t)
      {
      }
      throw new ClassNotFoundException(classname);
   }


   
Tries to load the class from the passed class' classloader, then current thread's context class loader.

Parameters:
clazz Class object used to obtain a class loader if no context class loader is available.
classname Desired class.
Returns:
Class, or null on failure.
   public static Class loadClass(final Class clazzString classnamethrows ClassNotFoundException
   {
      ClassLoader loader;
      if (clazz != null)
      {
         try
         {
            loader = (ClassLoader) AccessController.doPrivilegednew PrivilegedAction()
            {
               public Object run()
               {
                  return clazz.getClassLoader();
               }
            });
            
            if (loader != null)
            {
               return Class.forName(classnamefalseloader);
            }
         }
         catch (Throwable t)
         {
         }
      }
      try
      {
         loader = (ClassLoader) AccessController.doPrivilegednew PrivilegedAction()
         {
            public Object run()
            {
               return Thread.currentThread().getContextClassLoader();
            }
         });
         if (loader != null)
         {
            return Class.forName(classnamefalseloader);
         }
      }
      catch (Throwable t)
      {
      }
      try
      {
         loader = (ClassLoader) AccessController.doPrivilegednew PrivilegedAction()
         {
            public Object run()
            {
               return ClassLoader.getSystemClassLoader();
            }
         });
         if (loader != null)
         {
            return Class.forName(classnamefalseloader);
         }
      }
      catch (Throwable t)
      {
      }
      throw new ClassNotFoundException(classname);
   }
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