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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2011, Red Hat, Inc., 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.ejb.client.remoting;

import java.security.AccessController;
import java.security.PrivilegedAction;

/**
 * @author Jaikiran Pai
 */
final class SecurityActions {

    private static final PrivilegedAction GET_CLASS_LOADER = new PrivilegedAction() {
        @Override
        public ClassLoader run() {
            return Thread.currentThread().getContextClassLoader();
        }
    };

    static ClassLoader getContextClassLoader() {
        if (System.getSecurityManager() == null) {
            return Thread.currentThread().getContextClassLoader();
        } else {
            return AccessController.doPrivileged(GET_CLASS_LOADER);
        }
    }

    static void addShutdownHook(final Thread shutdownHook) {
        final SecurityManager sm = System.getSecurityManager();
        if (sm == null) {
            Runtime.getRuntime().addShutdownHook(shutdownHook);
        } else {
            AccessController.doPrivileged(new PrivilegedAction() {
                public Void run() {
                    Runtime.getRuntime().addShutdownHook(shutdownHook);
                    return null;
                }
            });
        }
    }

    static Boolean removeShutdownHook(final Thread shutdownHook) {
        final SecurityManager sm = System.getSecurityManager();
        if (sm == null) {
            return Runtime.getRuntime().removeShutdownHook(shutdownHook);
        } else {
            return AccessController.doPrivileged(new PrivilegedAction() {
                public Boolean run() {
                    return Runtime.getRuntime().removeShutdownHook(shutdownHook);
                }
            });
        }
    }

    private SecurityActions() {

    }
}