@Override
    default Optional<String> getEnumConstants() {
        return Optional.ofNullable(enumConstantsProperty().get());
    }
Observable property for the {@link #getEnumConstants()}-fields. The value
may be {@code null}.

@return  the observable property for enum constants
tool-parent/tool-config/src/main/java/com/speedment/tool/config/trait/HasEnumConstantsProperty.java