/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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.apache.harmony.awt;

import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;

public final class Utils {

    public static String getSystemProperty(final String name) {
        return getSystemProperty(name, null);
    }
    
    public static String getSystemProperty(final String name, final String value) {
        return AccessController.doPrivileged(new PrivilegedAction<String>() {
            public String run() {
                return System.getProperty(name, value);
            }
        });
    }

    public static void loadLibrary(final String name)
                    throws UnsatisfiedLinkError, NullPointerException {
        try {
            AccessController.doPrivileged(new PrivilegedExceptionAction<Object>() {
                public Object run() {
                    System.loadLibrary(name);
                    return null;
                }
            });
        } catch (final PrivilegedActionException ex) {
            final Throwable cause = ex.getCause();

            if (cause instanceof UnsatisfiedLinkError) {
                throw (UnsatisfiedLinkError) cause;
            }

            if (cause instanceof NullPointerException) {
                throw (NullPointerException) cause;
            }
        }
    }
}