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JBoss specific integration layer for teiid

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/*
 * Copyright Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags and
 * the COPYRIGHT.txt file distributed with this work.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.teiid.jboss;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLClassLoader;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;


/**
 *  Privileged Blocks
 *  @author [email protected]
 *  @since  Sep 26, 2007 
 *  @version $Revision$
 */
class ResourceActions
{
   static ClassLoader getContextClassLoader()
   {
      return AccessController.doPrivileged(new PrivilegedAction()
      { 
         public ClassLoader run()
         { 
            return Thread.currentThread().getContextClassLoader();
         }
       });  
   }
   
   static URL findResource(final URLClassLoader cl, final String name)
   {
      return AccessController.doPrivileged(new PrivilegedAction()
      { 
         public URL run()
         { 
            return cl.findResource(name);
         }
       });  
   }
   
   static InputStream openStream(final URL url) throws PrivilegedActionException
   {
      return AccessController.doPrivileged(new PrivilegedExceptionAction()
      { 
         public InputStream run() throws IOException
         { 
            return url.openStream();
         }
       });
   }
}