/**
* Creates a new guard
*
* @param controller The controller for which actions are created.
*/
public ReplaceActionGuard(DockController controller) {
if (controller == null) throw new IllegalArgumentException("Controller should not be null");
action = new ReplaceAction(controller);
source = new DefaultDockActionSource();
source.setHint(new LocationHint(LocationHint.ACTION_GUARD, LocationHint.LEFT));
setVisible(true);
}
