if (functionName.equals("build-new-unit")) {
return new BuildUnitAction(this, this.mainMapView);
} else if (functionName.equals("set-field")) {
return new SetFieldAction(this, this.mainMapView, this.registry);
} else if (functionName.equals("build-new-city")) {
return new BuildCityAction(this, this.mainMapView);
} else if (functionName.equals("remove-map-object")) {
return new RemoveMapObjectAction(this.mainMapView);
} else {
return null;
}