/*
* JBoss, Home of Professional Open Source.
* Copyright 2009, Red Hat Middleware LLC, 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.identity.federation.core.wstrust;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
/**
* <p>
* Utility class that executes actions such as creating a class in privileged blocks.
* </p>
*
* @author <a href="mailto:sguilhen@redhat.com">Stefan Guilhen</a>
*/
class SecurityActions
{
/**
* <p>
* Gets the thread context class loader using a privileged block.
* </p>
*
* @return a reference to the thread context {@code ClassLoader}.
*/
static ClassLoader getContextClassLoader()
{
return AccessController.doPrivileged(new PrivilegedAction<ClassLoader>()
{
public ClassLoader run()
{
return Thread.currentThread().getContextClassLoader();
}
});
}
/**
* <p>
* Loads a class using the thread context class loader in a privileged block.
* </p>
*
* @param name the fully-qualified name of the class to be loaded.
* @return a reference to the loaded {@code Class}.
* @throws PrivilegedActionException if an error occurs while loading the class. This exception wraps the real cause
* of the error, so classes using this method must perform a {@code getCause()} in order to get a
* reference to the root of the error.
*/
static Class<?> loadClass(final String name) throws PrivilegedActionException
{
return AccessController.doPrivileged(new PrivilegedExceptionAction<Class<?>>()
{
public Class<?> run() throws PrivilegedActionException
{
try
{
return getContextClassLoader().loadClass(name);
}
catch (Exception e)
{
throw new PrivilegedActionException(e);
}
}
});
}
/**
* <p>
* Creates an instance of the specified class in a privileged block. The class must define a default constructor.
* </p>
*
* @param className the fully-qualified name of the class to be instantiated.
* @return a reference to the instantiated {@code Object}.
* @throws PrivilegedActionException if an error occurs while instantiating the class. This exception wraps the real
* cause of the error, so classes using this method must perform a {@code getCause()} in order to get a
* reference to the root of the error.
*/
static Object instantiateClass(final String className) throws PrivilegedActionException
{
return AccessController.doPrivileged(new PrivilegedExceptionAction<Object>()
{
public Object run() throws Exception
{
Class<?> objectClass = loadClass(className);
return objectClass.newInstance();
}
});
}
}