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JBoss Microcontainer Reliance Rules
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/*
* JBoss, Home of Professional Open Source
* Copyright 2006, 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.reliance.drools.deployer;

import java.io.InputStream;
import java.io.IOException;
import java.security.AccessController;
import java.security.PrivilegedExceptionAction;
import java.security.PrivilegedActionException;
import java.lang.reflect.UndeclaredThrowableException;

import org.jboss.virtual.VirtualFile;

/**
 * @author [email protected]
 * @author Ales Justin
 * @version $Revision: 60921 $
 */
public class SecurityActions
{
   /**
    * Actions for File access
    */
   interface FileActions
   {
      FileActions PRIVILEGED = new FileActions()
      {
         public InputStream openStream(final VirtualFile f) throws IOException
         {
            try
            {
               return AccessController.doPrivileged(new PrivilegedExceptionAction()
               {
                  public InputStream run() throws Exception
                  {
                     return f.openStream();
                  }
               });
            }
            catch(PrivilegedActionException e)
            {
               Exception ex = e.getException();
               if( ex instanceof IOException )
                  throw (IOException) ex;
               else if( ex instanceof RuntimeException )
                  throw (RuntimeException) ex;
               else
                  throw new UndeclaredThrowableException(ex);
            }
         }
      };

      FileActions NON_PRIVILEGED = new FileActions()
      {
         public InputStream openStream(VirtualFile f) throws IOException
         {
            return f.openStream();
         }
      };

      public InputStream openStream(VirtualFile f) throws IOException;
   }

   static InputStream openStream(VirtualFile f) throws IOException
   {
      SecurityManager sm = System.getSecurityManager();
      if( sm != null )
         return FileActions.PRIVILEGED.openStream(f);
      else
         return FileActions.NON_PRIVILEGED.openStream(f);
   }
}