/*
 * IronJacamar, a Java EE Connector Architecture implementation
 * Copyright 2010, Red Hat Inc, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file 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.jca.adapters.jdbc.extensions.mysql;

import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;

/**
 * Privileged Blocks
 * 
 * @author <a href="mailto:jesper.pedersen@ironjacamar.org">Jesper Pedersen</a>
 */
class SecurityActions
{
   /**
    * Get the classloader.
    * @param c The class
    * @return The classloader
    */
   static ClassLoader getClassLoader(final Class<?> c)
   {
      if (System.getSecurityManager() == null)
         return c.getClassLoader();

      return AccessController.doPrivileged(new PrivilegedAction<ClassLoader>()
      {
         public ClassLoader run()
         {
            return c.getClassLoader();
         }
      });
   }

   /**
    * Get the context classloader.
    * @return The classloader
    */
   static ClassLoader getThreadContextClassLoader()
   {
      if (System.getSecurityManager() == null)
      {
         return Thread.currentThread().getContextClassLoader();
      }
      else
      {
         return AccessController.doPrivileged(new PrivilegedAction<ClassLoader>()
         {
            public ClassLoader run()
            {
               return Thread.currentThread().getContextClassLoader();
            }
         });
      }
   }

   /**
    * SetAccessible
    * @param m The method
    */
   static void setAccessible(final Method m)
   {
      if (m == null)
         return;

      AccessController.doPrivileged(new PrivilegedAction<Object>()
      {
         public Object run()
         {
            m.setAccessible(true);

            return null;
         }
      });
   }

   /**
    * Get the method
    * @param c The class
    * @param name The name
    * @param params The parameters
    * @return The method
    * @exception NoSuchMethodException If a matching method is not found.
    */
   static Method getMethod(final Class<?> c, final String name, final Class<?>... params)
      throws NoSuchMethodException
   {
      if (System.getSecurityManager() == null)
         return c.getMethod(name, params);

      Method result = AccessController.doPrivileged(new PrivilegedAction<Method>()
      {
         public Method run()
         {
            try
            {
               return c.getMethod(name, params);
            }
            catch (NoSuchMethodException e)
            {
               return null;
            }
         }
      });

      if (result != null)
         return result;

      throw new NoSuchMethodException();
   }
}
