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// Portions Copyright [2018-2019] [Payara Foundation and/or its affiliates]
package org.omnifaces.eleos.config.helper;

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

/**
 * This class provides an optimization for some methods in java.security.AccessController.
 * 
 * @author Shing Wai Chan
 * @author Arjan Tijms
 */
public final class PriviledgedAccessController {

    private static boolean hasSecurityManager = System.getSecurityManager() != null;

    private PriviledgedAccessController() {
    }

    public static void privilegedWithException(Runnable runnable) throws PrivilegedActionException {
        if (hasSecurityManager) {
            AccessController.doPrivileged((PrivilegedExceptionAction) () -> {
                runnable.run();
                return null;
            });

        }
        
        try {
            runnable.run();
        } catch (Exception e) {
            throw new PrivilegedActionException(e);
        }
    }

    public static Object privilegedNoCheck(Runnable runnable) {
        return AccessController.doPrivileged((PrivilegedAction) () -> {
            runnable.run();
            return null;
        });
    }

    public static  T privilegedNoCheck(PrivilegedAction privilegedAction) {
        return AccessController.doPrivileged(privilegedAction);
    }

    public static Object doPrivileged(PrivilegedAction action) {
        if (hasSecurityManager) {
            return AccessController.doPrivileged(action);
        }

        return action.run();
    }

    public static Object doPrivileged(PrivilegedExceptionAction privilegedExceptionAction) throws PrivilegedActionException {
        if (hasSecurityManager) {
            return AccessController.doPrivileged(privilegedExceptionAction);
        }

        try {
            return privilegedExceptionAction.run();
        } catch (Exception e) {
            throw new PrivilegedActionException(e);
        }

    }

    public static  T privileged(PrivilegedAction privilegedAction) {
        if (hasSecurityManager) {
            return AccessController.doPrivileged(privilegedAction);
        }

        return privilegedAction.run();
    }

    public static Object privileged(Runnable runnable) {
        if (hasSecurityManager) {
            return AccessController.doPrivileged((PrivilegedAction) () -> {
                runnable.run();
                return null;
            });
        }

        runnable.run();
        return null;
    }

}