How to use

PrivilegedAction

in

java.security

private static <T> T doPrivileged(PrivilegedAction<T> action) {
 if (System.getSecurityManager() != null) {
   return AccessController.doPrivileged(action);
 } else {
   return action.run();
 }
}

 public static Charset defaultCharset() {
synchronized (Charset.class) {
  if (defaultCharset == null) {
  java.security.PrivilegedAction pa =
    new GetPropertyAction("file.encoding");
  String csn = (String)AccessController.doPrivileged(pa);
  Charset cs = lookup(csn);
  if (cs != null)
    return cs;
  return forName("UTF-8");
  }
  return defaultCharset;
}
}

/**
 * Calls {@code action.run()}.
 */
public static <T> T doPrivileged(PrivilegedAction<T> action, AccessControlContext context) {
  return action.run();
}

/**
 * Calls {@code action.run()}.
 */
public static <T> T doPrivileged(PrivilegedAction<T> action) {
  return action.run();
}

  private <P> P run(PrivilegedAction<P> action) {
    return System.getSecurityManager() != null ? AccessController.doPrivileged( action ) : action.run();
  }
}

 public static Charset defaultCharset() {
  if (defaultCharset == null) {
  synchronized (Charset.class) {
  java.security.PrivilegedAction pa =
    new GetPropertyAction("file.encoding");
  String csn = (String)AccessController.doPrivileged(pa);
  Charset cs = lookup(csn);
  if (cs != null)
    defaultCharset = cs;
      else 
    defaultCharset = forName("UTF-8");
    }
}
return defaultCharset;
}

/**
 * Calls {@code action.run()}.
 */
public static <T> T doPrivilegedWithCombiner(PrivilegedAction<T> action) {
  return action.run();
}

/**
 * Gets the current Thread ClassLoader. Returns the system ClassLoader if the TCCL is {@code null}. If the system
 * ClassLoader is {@code null} as well, then the ClassLoader for this class is returned. If running with a
 * {@link SecurityManager} that does not allow access to the Thread ClassLoader or system ClassLoader, then the
 * ClassLoader for this class is returned.
 *
 * @return the current ThreadContextClassLoader.
 */
public static ClassLoader getThreadContextClassLoader() {
  if (GET_CLASS_LOADER_DISABLED) {
    // we can at least get this class's ClassLoader regardless of security context
    // however, if this is null, there's really no option left at this point
    return LoaderUtil.class.getClassLoader();
  }
  return SECURITY_MANAGER == null ? TCCL_GETTER.run() : AccessController.doPrivileged(TCCL_GETTER);
}

@Override
public <T> T execute(PrivilegedAction<T> action) {
 return action.run();
}

private static Method doPrivilegedAction(PrivilegedAction<Method> privilegedAction) {
  Class<?> callerClass = getCallerClass();
  if ( !authorizedClasses.contains( callerClass.getName() ) ) {
    throw new SecurityException( "Unauthorized call by class " + callerClass );
  }
  return System.getSecurityManager() != null ? AccessController.doPrivileged( privilegedAction ) :
    privilegedAction.run();
}

public static <T> T doPrivileged(PrivilegedAction<T> action) {
  final Boolean original = privileged.get();
  privileged.set(Boolean.TRUE);
  try {
    return action.run();
  } finally {
    privileged.set(original);
  }
}

  private AttributeAccess buildAttributeAccess(final String attributeName) {
    final PrivilegedAction<AttributeAccess> action = new PrivilegedAction<AttributeAccess>() {
      @Override
      public AttributeAccess run() {
        for ( Class clazz : classHierarchy ) {
          try {
            final Field field = clazz.getDeclaredField( attributeName );
            if ( field != null ) {
              return new FieldAttributeAccess( field );
            }
          }
          catch ( NoSuchFieldException e ) {
            final Method method = getMethod( clazz, attributeName );
            if ( method != null ) {
              return new MethodAttributeAccess( attributeName, method );
            }
          }
        }
        //we could not find any match
        return new NoSuchAttributeAccess( specifiedClass, attributeName );
      }
    };
    return System.getSecurityManager() != null ? AccessController.doPrivileged( action ) : action.run();
  }
}

    public Object call() { return action.run(); }};
}

/**
 * Perform an action with permission checking enabled.  If permission checking is already enabled, the action is
 * simply run.
 *
 * @param action the action to perform
 * @param context the access control context to use
 * @param <T> the action return type
 * @return the return value of the action
 */
public static <T> T doChecked(PrivilegedAction<T> action, AccessControlContext context) {
  final Context ctx = CTX.get();
  if (ctx.checking) {
    return action.run();
  }
  ctx.checking = true;
  try {
    return AccessController.doPrivileged(action, context);
  } finally {
    ctx.checking = false;
  }
}

/**
 * Perform an action with permission checking enabled.  If permission checking is already enabled, the action is
 * simply run.
 *
 * @param action the action to perform
 * @param <T> the action return type
 * @return the return value of the action
 */
public static <T> T doChecked(PrivilegedAction<T> action) {
  final Context ctx = CTX.get();
  if (ctx.checking) {
    return action.run();
  }
  ctx.checking = true;
  try {
    return action.run();
  } finally {
    ctx.checking = false;
  }
}

static <T> T doPrivileged(final PrivilegedAction<T> action) {
  return WildFlySecurityManager.isChecking() ? AccessController.doPrivileged(action) : action.run();
}

/**
 * Perform an action with permission checking disabled.  If permission checking is already disabled, the action is
 * simply run.  The immediate caller must have the {@code doUnchecked} runtime permission.
 *
 * @param action the action to perform
 * @param <T> the action return type
 * @return the return value of the action
 */
public static <T> T doUnchecked(PrivilegedAction<T> action) {
  final Context ctx = CTX.get();
  if (! ctx.checking) {
    return action.run();
  }
  ctx.checking = false;
  try {
    final SecurityManager sm = getSecurityManager();
    if (sm != null) {
      checkPDPermission(getCallerClass(2), doUncheckedPermission);
    }
    return action.run();
  } finally {
    ctx.checking = true;
  }
}

return System.getSecurityManager() != null ? AccessController.doPrivileged( getCallerClassAction ) :
    getCallerClassAction.run();

void doAsSubject(final java.security.PrivilegedAction<Void> action) {
  if (getSubject() == null) {
    action.run();
  } else {
    Subject.doAs(getSubject(), action);
  }
}

@Override
public Object processInvocation(final InterceptorContext context) throws Exception {
  // TODO - special cases need to be handled where SecurityContext not established or minimal unauthenticated principal context instead.
  String previousContextID = this.setContextID(this.policyContextID);
  if (WildFlySecurityManager.isChecking()) {
    doPrivileged(pushAction);
  } else {
    pushAction.run();
  }
  try {
    return context.proceed();
  } finally {
    this.setContextID(previousContextID);
    if (WildFlySecurityManager.isChecking()) {
      doPrivileged(popAction);
    } else {
      popAction.run();
    }
  }
}