/*
 * Copyright (C) 2013 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 library 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 library 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 library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301  USA
 */

package org.jboss.as.domain.management.security;

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

/**
 *  Privileged blocks for this package
 *
 * @author <a href="mailto:cdolphy@redhat.com">Chris Dolphy</a>  (c) 2015 Red Hat, inc.
 */
final class SecurityActions {

    private SecurityActions() {
        // forbidden inheritance
    }

    /**
     * Gets context classloader.
     *
     * @return the current context classloader
     */
    static ClassLoader getContextClassLoader() {
        if (System.getSecurityManager() == null) {
            return Thread.currentThread().getContextClassLoader();
        } else {
            return AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
                public ClassLoader run() {
                    return Thread.currentThread().getContextClassLoader();
                }
            });
        }
    }

    /**
     * Sets context classloader.
     *
     * @param clazz the class which classloader we want to use.
     */
    static void setContextClassLoader(final Class clazz) {
        setContextClassLoader(clazz.getClassLoader());
    }

    /**
     * Sets context classloader.
     *
     * @param classLoader the classloader
     */
    static void setContextClassLoader(final ClassLoader classLoader) {
        if (System.getSecurityManager() == null) {
            Thread.currentThread().setContextClassLoader(classLoader);
        } else {
            AccessController.doPrivileged(new PrivilegedAction<Object>() {
                public Object run() {
                    Thread.currentThread().setContextClassLoader(classLoader);
                    return null;
                }
            });
        }
    }

    /**
     * Gets a system property
     *
     * @param name system property name
     * @param defaultValue default value if property not found
     */
    static String getSystemProperty(final String name, final String defaultValue) {
        if (System.getSecurityManager() != null) {
            return AccessController.doPrivileged(new PrivilegedAction<String>() {
                public String run() {
                    return System.getProperty(name, defaultValue);
                }
            });
        } else {
            return System.getProperty(name, defaultValue);
        }
    }

}