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/*
 * Copyright (c) 2003 The Visigoth Software Society. All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowledgement:
 *       "This product includes software developed by the
 *        Visigoth Software Society (http://www.visigoths.org/)."
 *    Alternately, this acknowledgement may appear in the software itself,
 *    if and wherever such third-party acknowledgements normally appear.
 *
 * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the 
 *    project contributors may be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact [email protected].
 *
 * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
 *    nor may "FreeMarker" or "Visigoth" appear in their names
 *    without prior written permission of the Visigoth Software Society.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Visigoth Software Society. For more
 * information on the Visigoth Software Society, please see
 * http://www.visigoths.org/
 */

package freemarker.template.utility;

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

import freemarker.log.Logger;

/**
 * @author Attila Szegedi
 * @version $Id: SecurityUtilities.java,v 1.2 2004/11/11 13:27:39 szegedia Exp $
 */
public class SecurityUtilities
{
    private static final Logger logger = Logger.getLogger("freemarker.security");
    private SecurityUtilities()
    {
    }
    
    public static String getSystemProperty(final String key)
    {
        return (String) AccessController.doPrivileged(
            new PrivilegedAction()
            {
                public Object run()
                {
                    return System.getProperty(key);
                }
            });
    }

    public static String getSystemProperty(final String key, final String defValue)
    {
        try
        {
            return (String) AccessController.doPrivileged(
                new PrivilegedAction()
                {
                    public Object run()
                    {
                        return System.getProperty(key, defValue);
                    }
                });
        }
        catch(AccessControlException e)
        {
            logger.warn("Insufficient permissions to read system property '" + 
                    key + "', using default value '" + defValue + "'");
            return defValue;
        }
    }

    public static Integer getSystemProperty(final String key, final int defValue)
    {
        try
        {
            return (Integer) AccessController.doPrivileged(
                new PrivilegedAction()
                {
                    public Object run()
                    {
                        return Integer.getInteger(key, defValue);
                    }
                });
        }
        catch(AccessControlException e)
        {
            logger.warn("Insufficient permissions to read system property '" + 
                    key + "', using default value " + defValue + "");
            return new Integer(defValue);
        }
    }
}