org.jboss.arquillian.graphene.location.SecurityActions Maven / Gradle / Ivy
/**
* JBoss, Home of Professional Open Source
* Copyright 2013, Red Hat, Inc. and individual contributors
* 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.arquillian.graphene.location;
import java.security.AccessController;
import java.security.PrivilegedAction;
/**
* SecurityActions
*
* A set of privileged actions that are not to leak out of this package
*
*
* @author ALR
*
* @version $Revision: $
*/
final class SecurityActions {
// -------------------------------------------------------------------------------||
// Constructor
// ------------------------------------------------------------------||
// -------------------------------------------------------------------------------||
/**
* No instantiation
*/
private SecurityActions() {
throw new UnsupportedOperationException("No instantiation");
}
// -------------------------------------------------------------------------------||
// Utility Methods
// --------------------------------------------------------------||
// -------------------------------------------------------------------------------||
/**
* Obtains the Thread Context ClassLoader
*/
static ClassLoader getThreadContextClassLoader() {
return AccessController.doPrivileged(GetTcclAction.INSTANCE);
}
/**
* Create a new instance.
*
* @param className Full classname of class to create
* @param argumentTypes The constructor argument types
* @param arguments The constructor arguments
* @return a new instance or null if it is unable to load
* @throws IllegalArgumentException when {@code className} is null
*/
static Class newInstance(final String className) {
if (className == null) {
throw new IllegalArgumentException("Unable to instantiate class with null class name string.");
}
try {
ClassLoader classLoader = getThreadContextClassLoader();
return classLoader.loadClass(className);
} catch (ClassNotFoundException e) {
return null;
}
}
// -------------------------------------------------------------------------------||
// Inner Classes
// ----------------------------------------------------------------||
// -------------------------------------------------------------------------------||
/**
* Single instance to get the TCCL
*/
private enum GetTcclAction implements PrivilegedAction {
INSTANCE;
@Override
public ClassLoader run() {
return Thread.currentThread().getContextClassLoader();
}
}
}