bcprov/src/main/java/org/bouncycastle/util/Properties.java

package org.bouncycastle.util;

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

/**
 * Utility method for accessing system properties.
 */
public class Properties
{
    public static boolean isOverrideSet(final String propertyName)
    {
        try
        {
            return "true".equals(AccessController.doPrivileged(new PrivilegedAction()
            {
                // JDK 1.4 compatibility
                public Object run()
                {
                    String value = System.getProperty(propertyName);
                    if (value == null)
                    {
                        return null;
                    }

                    return Strings.toLowerCase(value);
                }
            }));
        }
        catch (AccessControlException e)
        {
            return false;
        }
    }
}