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SPI to Resolve Dependencies from a Generic Backend
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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2009, Red Hat Middleware LLC, and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * 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.jboss.shrinkwrap.resolver.spi.loader;

import java.lang.reflect.Constructor;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;

/**
 * A set of privileged actions that are not to leak out of this package
 *
 * @author ALR
 * @author Karel Piwko
 */
final class SecurityActions {

    /**
     * No instantiation
     */
    private SecurityActions() {
        throw new UnsupportedOperationException("No instantiation");
    }

    /**
     * Obtains the constructor specified by the given class and argument types.
     *
     * @param  the type of the class
     * @param clazz the class from which to obtain the constructor
     * @param argumentTypes the types of the constructor's arguments
     * @return the constructor specified by the given class and argument types
     * @throws NoSuchMethodException if a matching constructor cannot be found
     */
    static  Constructor getConstructor(final Class clazz, final Class... argumentTypes)
        throws NoSuchMethodException {
        try {
            return AccessController.doPrivileged((PrivilegedExceptionAction>)
                    () -> clazz.getConstructor(argumentTypes));
        }
        // Unwrap
        catch (final PrivilegedActionException pae) {
            final Throwable t = pae.getCause();
            // Rethrow
            if (t instanceof NoSuchMethodException) {
                throw (NoSuchMethodException) t;
            } else {
                // No other checked Exception thrown by Class.getConstructor
                try {
                    throw (RuntimeException) t;
                }
                // Just in case we've really messed up
                catch (final ClassCastException cce) {
                    throw new RuntimeException("Obtained unchecked Exception; this code should never be reached", t);
                }
            }
        }
    }

}