ublic class OptionalTypeAnnotationConstraintTest {

	private Validator validator;

	@BeforeClass
	public void setup() {
		validator = getValidator();
	}

	@Test
	public void without_type_annotation_on_optional_is_validated_for_null_value() {
		Model model = new Model();
		model.valueWithoutTypeAnnotation = null;

		Set<ConstraintViolation<Model>> constraintViolations = validator.validateProperty(
				model,
				"valueWithoutTypeAnnotation"
		);
		assertNumberOfViolations( constraintViolations, 1 );
		assertCorrectPropertyPaths( constraintViolations, "valueWithoutTypeAnnotation" );
		assertConstraintViolation( constraintViolations.iterator().next(), "container" );
		assertCorrectConstraintTypes( constraintViolations, NotNull.class );
	}

	@Test
	public void without_type_annotation_on_optional_is_validated_for_empty_value() {
		Model model = new Model();
		model.valueWithoutTypeAnnotation = Optional.empty();

		Set<ConstraintViolation<Model>> constraintViolations = validator.validateProperty(
				model,
				"valueWithoutTypeAnnotation"
		);
		assertNumberOfViolations( constraintViolations, 0 );
	}

	/**
	 * Actual: Fails with NullPointerException (Unexpected exception during isValid call)
	 */
	@Test
	public void not_null_type_on_optional_is_validated_for_null_value() {
		Model model = new Model();
		model.valueWithNotNull = null;

		Set<ConstraintViolation<Model>> constraintViolations = validator.validateProperty( model, "valueWithNotNull" );
		assertNumberOfViolations( constraintViolations, 1 );
		assertCorrectPropertyPaths( constraintViolations, "valueWithNotNull" );
		assertConstraintViolation( constraintViolations.iterator().next(), "container" );
		assertCorrectConstraintTypes( constraintViolations, NotNull.class );
	}

	/**
	 * Actual: NotNull violation occurs on container's annotation
	 */
	@Test
	public void not_null_type_on_optional_is_validated_for_empty_value() {
		Model model = new Model();
		model.valueWithNotNull = Optional.empty();

		Set<ConstraintViolation<Model>> constraintViolations = validator.validateProperty( model, "valueWithNotNull" );
		assertNumberOfViolations( constraintViolations, 1 );
		assertCorrectPropertyPaths( constraintViolations, "valueWithNotNull" );
		assertConstraintViolation( constraintViolations.iterator().next(), "type" );
		assertCorrectConstraintTypes( constraintViolations, NotNullTypeUse.class );
	}

	/**
	 * Actual: Fails with NullPointerException (Unexpected exception during isValid call)
	 */
	@Test
	public void null_or_not_blank_type_on_optional_is_validated_for_null_value() {
		Model model = new Model();
		model.valueWithNullOrNotBlank = null;

		Set<ConstraintViolation<Model>> constraintViolations = validator.validateProperty(
				model,
				"valueWithNullOrNotBlank"
		);
		assertNumberOfViolations( constraintViolations, 1 );
		assertCorrectPropertyPaths( constraintViolations, "valueWithNullOrNotBlank" );
		assertConstraintViolation( constraintViolations.iterator().next(), "container" );
		assertCorrectConstraintTypes( constraintViolations, NotNull.class );
	}

	/**
	 * Actual: NotNull violation occurs on container's annotation
	 */
	@Test
	public void null_or_not_blank_type_on_optional_is_validated_for_empty_value() {
		Model model = new Model();
		model.valueWithNullOrNotBlank = Optional.empty();

		Set<ConstraintViolation<Model>> constraintViolations = validator.validateProperty(
				model,
				"valueWithNullOrNotBlank"
		);
		assertNumberOfViolations( constraintViolations, 0 );
	}

	/**
	 * Actual: No violation
	 */
	@Test
	public void null_or_not_blank_type_on_optional_is_validated_for_blank_string() {
		Model model = new Model();
		model.valueWithNullOrNotBlank = Optional.of( "" );

		Set<ConstraintViolation<Model>> constraintViolations = validator.validateProperty(
				model,
				"valueWithNullOrNotBlank"
		);
		assertNumberOfViolations( constraintViolations, 1 );
		assertCorrectPropertyPaths( constraintViolations, "valueWithNullOrNotBlank" );
		assertConstraintViolation( constraintViolations.iterator().next(), "type" );
		assertCorrectConstraintTypes( constraintViolations, NullOrNotBlank.class );
	}

	@Test
	public void reference_is_validated_for_null_value() {
		Model model = new Model();
		model.valueReference = null;

		Set<ConstraintViolation<Model>> constraintViolations = validator.validateProperty( model, "valueReference" );
		assertNumberOfViolations( constraintViolations, 0 );
	}

	@Test
	public void reference_is_validated_for_empty_string() {
		Model model = new Model();
		model.valueReference = "";

		Set<ConstraintViolation<Model>> constraintViolations = validator.validateProperty( model, "valueReference" );
		assertNumberOfViolations( constraintViolations, 1 );
		assertCorrectPropertyPaths( constraintViolations, "valueReference" );
		assertConstraintViolation( constraintViolations.iterator().next(), "reference" );
		assertCorrectConstraintTypes( constraintViolations, NullOrNotBlank.class );
	}

	@Test
	public void reference_is_validated_for_valid_string() {
		Model model = new Model();
		model.valueReference = "1";

		Set<ConstraintViolation<Model>> constraintViolations = validator.validateProperty( model, "valueReference" );
		assertNumberOfViolations( constraintViolations, 0 );
	}

	@ConstraintComposition(CompositionType.OR)
	@Null
	@NotBlank
	@ReportAsSingleViolation
	@Constraint(validatedBy = { })
	@Target({ TYPE_USE, METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER })
	@Retention(RUNTIME)
	@Documented
	public @interface NullOrNotBlank {

		String message() default "NullOrNotBlank";

		Class<?>[] groups() default { };

		Class<? extends Payload>[] payload() default { };
	}

	private static class Model {

		@UnwrapValidatedValue(false)
		@NotNull(message = "container")
		Optional<String> valueWithoutTypeAnnotation;

		@UnwrapValidatedValue(false)
		@NotNull(message = "container")
		Optional<@NotNullTypeUse(message = "type") String> valueWithNotNull;

		@UnwrapValidatedValue(false)
		@NotNull(message = "container")
		Optional<@NullOrNotBlank(message = "type") String> valueWithNullOrNotBlank;

		@NullOrNotBlank(message = "reference")
		String valueReference;
	}
}