/**
 * Validates the Bean Validation constraints specified at the parameters and/or
 * return value of the intercepted method.
 *
 * @param ctx The context of the intercepted method invocation.
 * @param customValidator Custom Validator
 *
 * @return The result of the method invocation.
 *
 * @throws Exception Any exception caused by the intercepted method invocation.
 *         A {@link ConstraintViolationException} in case at least one
 *         constraint violation occurred either during parameter or
 *         return value validation.
 */
protected Object validateMethodInvocation(InvocationContext ctx) throws Exception {

    ExecutableValidator executableValidator = validator.forExecutables();
    Set<ConstraintViolation<Object>> violations = executableValidator.validateParameters(ctx.getTarget(),
            ctx.getMethod(), ctx.getParameters());

    if (!violations.isEmpty()) {
        throw new ConstraintViolationException(getMessage(ctx.getMethod(), ctx.getParameters(), violations),
                violations);
    }

    Object result = ctx.proceed();

    violations = executableValidator.validateReturnValue(ctx.getTarget(), ctx.getMethod(), result);

    if (!violations.isEmpty()) {
        throw new ConstraintViolationException(getMessage(ctx.getMethod(), ctx.getParameters(), violations),
                violations);
    }

    return result;
}
 

/**
 * Validates the Bean Validation constraints specified at the parameters and/or
 * return value of the intercepted constructor.
 *
 * @param ctx The context of the intercepted constructor invocation.
 *
 * @throws Exception Any exception caused by the intercepted constructor
 *         invocation. A {@link ConstraintViolationException} in case
 *         at least one constraint violation occurred either during
 *         parameter or return value validation.
 */
protected void validateConstructorInvocation(InvocationContext ctx) throws Exception {
    ExecutableValidator executableValidator = validator.forExecutables();
    Set<? extends ConstraintViolation<?>> violations = executableValidator
            .validateConstructorParameters(ctx.getConstructor(), ctx.getParameters());

    if (!violations.isEmpty()) {
        throw new ConstraintViolationException(getMessage(ctx.getConstructor(), ctx.getParameters(), violations),
                violations);
    }

    ctx.proceed();
    Object createdObject = ctx.getTarget();

    violations = validator.forExecutables().validateConstructorReturnValue(ctx.getConstructor(), createdObject);

    if (!violations.isEmpty()) {
        throw new ConstraintViolationException(getMessage(ctx.getConstructor(), ctx.getParameters(), violations),
                violations);
    }
}
 

/**
 *
 * @param invocation
 * @return
 * @throws ConstraintViolationException incase of any constraints
 * defined on method parameters are violated.
 */
@Override
public Object invoke(MethodInvocation invocation) throws Throwable {

    if (skipMethod(invocation)) {
        return invocation.proceed();
    }

    ExecutableValidator executableValidator = validatorProvider.get().forExecutables();

    Set<ConstraintViolation<Object>> result = executableValidator.validateParameters(
            invocation.getThis(), invocation.getMethod(), invocation.getArguments());

    if (!result.isEmpty()) {
        throw new ConstraintViolationException(result);
    }

    return invocation.proceed();
}
 

@Override
protected void configure() {
    final GuiceConstraintValidatorFactory constraintValidatorFactory = new GuiceConstraintValidatorFactory();
    requestInjection(constraintValidatorFactory);

    /* Overriding just constraints factory to allow them use guice injections */
    final Validator validator = factory.usingContext()
            .constraintValidatorFactory(constraintValidatorFactory)
            .getValidator();

    bind(Validator.class).toInstance(validator);
    bind(ExecutableValidator.class).toInstance(validator.forExecutables());
    // NOTE bound factory is not aware of guice! because it use default ConstraintValidatorFactory
    bind(ValidatorFactory.class).toInstance(factory);
    bind(ValidationContext.class);

    bindConstant().annotatedWith(Names.named("guice.validator.addDefaultGroup")).to(addDefaultGroup);
    final ValidationGroupInterceptor groupInterceptor = new ValidationGroupInterceptor();
    requestInjection(groupInterceptor);
    configureGroupsAop(groupInterceptor);

    final ValidationMethodInterceptor interceptor = new ValidationMethodInterceptor();
    requestInjection(interceptor);
    configureAop(interceptor);
}
 

@Test
public void testMethodParameters() throws NoSuchMethodException {
    ExecutableValidator executableValidator = validator.forExecutables();
    Method method = RentalStation.class.getMethod("rentCar", String.class, Date.class,
            Integer.TYPE);
    RentalStation station = new RentalStation("hertz", "");
    Set<ConstraintViolation<RentalStation>> violations = executableValidator.validateParameters(
            station, method, new Object[]{"Clement", new Date(System.currentTimeMillis() + 10000), 1});
    assertThat(violations.size()).isEqualTo(0);
    violations = executableValidator.validateParameters(
            station, method, new Object[]{"Clement", new Date(System.currentTimeMillis() - 10000), 1});
    assertThat(violations.size()).isEqualTo(1);
    violations = executableValidator.validateParameters(
            station, method, new Object[]{"Clement", new Date(System.currentTimeMillis() - 10000), 0});
    assertThat(violations.size()).isEqualTo(2);
    violations = executableValidator.validateParameters(
            station, method, new Object[]{null, new Date(System.currentTimeMillis() - 10000), 0});
    assertThat(violations.size()).isEqualTo(3);
}
 

@Test
public void testMethodParameters() throws NoSuchMethodException {
    ExecutableValidator executableValidator = validator.forExecutables();
    Method method = RentalStation.class.getMethod("rentCar", String.class, Date.class,
            Integer.TYPE);
    RentalStation station = new RentalStation("hertz", "");
    Set<ConstraintViolation<RentalStation>> violations = executableValidator.validateParameters(
            station, method, new Object[]{"Clement", new Date(System.currentTimeMillis() + 10000), 1});
    assertThat(violations.size()).isEqualTo(0);
    violations = executableValidator.validateParameters(
            station, method, new Object[]{"Clement", new Date(System.currentTimeMillis() - 10000), 1});
    assertThat(violations.size()).isEqualTo(1);
    violations = executableValidator.validateParameters(
            station, method, new Object[]{"Clement", new Date(System.currentTimeMillis() - 10000), 0});
    assertThat(violations.size()).isEqualTo(2);
    violations = executableValidator.validateParameters(
            station, method, new Object[]{null, new Date(System.currentTimeMillis() - 10000), 0});
    assertThat(violations.size()).isEqualTo(3);
}
 

@Override
@SuppressWarnings("unchecked")
public Object invoke(MethodInvocation invocation) throws Throwable {
	// Avoid Validator invocation on FactoryBean.getObjectType/isSingleton
	if (isFactoryBeanMetadataMethod(invocation.getMethod())) {
		return invocation.proceed();
	}

	Class<?>[] groups = determineValidationGroups(invocation);

	// Standard Bean Validation 1.1 API
	ExecutableValidator execVal = this.validator.forExecutables();
	Method methodToValidate = invocation.getMethod();
	Set<ConstraintViolation<Object>> result;

	try {
		result = execVal.validateParameters(
				invocation.getThis(), methodToValidate, invocation.getArguments(), groups);
	}
	catch (IllegalArgumentException ex) {
		// Probably a generic type mismatch between interface and impl as reported in SPR-12237 / HV-1011
		// Let's try to find the bridged method on the implementation class...
		methodToValidate = BridgeMethodResolver.findBridgedMethod(
				ClassUtils.getMostSpecificMethod(invocation.getMethod(), invocation.getThis().getClass()));
		result = execVal.validateParameters(
				invocation.getThis(), methodToValidate, invocation.getArguments(), groups);
	}
	if (!result.isEmpty()) {
		throw new ConstraintViolationException(result);
	}

	Object returnValue = invocation.proceed();

	result = execVal.validateReturnValue(invocation.getThis(), methodToValidate, returnValue, groups);
	if (!result.isEmpty()) {
		throw new ConstraintViolationException(result);
	}

	return returnValue;
}
 

@Override
@SuppressWarnings("unchecked")
public Object invoke(MethodInvocation invocation) throws Throwable {
	// Avoid Validator invocation on FactoryBean.getObjectType/isSingleton
	if (isFactoryBeanMetadataMethod(invocation.getMethod())) {
		return invocation.proceed();
	}

	Class<?>[] groups = determineValidationGroups(invocation);

	// Standard Bean Validation 1.1 API
	ExecutableValidator execVal = this.validator.forExecutables();
	Method methodToValidate = invocation.getMethod();
	Set<ConstraintViolation<Object>> result;

	try {
		result = execVal.validateParameters(
				invocation.getThis(), methodToValidate, invocation.getArguments(), groups);
	}
	catch (IllegalArgumentException ex) {
		// Probably a generic type mismatch between interface and impl as reported in SPR-12237 / HV-1011
		// Let's try to find the bridged method on the implementation class...
		methodToValidate = BridgeMethodResolver.findBridgedMethod(
				ClassUtils.getMostSpecificMethod(invocation.getMethod(), invocation.getThis().getClass()));
		result = execVal.validateParameters(
				invocation.getThis(), methodToValidate, invocation.getArguments(), groups);
	}
	if (!result.isEmpty()) {
		throw new ConstraintViolationException(result);
	}

	Object returnValue = invocation.proceed();

	result = execVal.validateReturnValue(invocation.getThis(), methodToValidate, returnValue, groups);
	if (!result.isEmpty()) {
		throw new ConstraintViolationException(result);
	}

	return returnValue;
}
 

@AroundInvoke
public Object validateMethodInvocation(InvocationContext ctx) throws Exception {

    Object resource = ctx.getTarget();
    Method method = ctx.getMethod();

    log.log(Level.FINE, "Starting validation for controller method: {0}#{1}", new Object[]{
            resource.getClass().getName(), method.getName()
    });

    Validator validator = validatorFactory.getValidator();
    ExecutableValidator executableValidator = validator.forExecutables();

    // validate controller property parameters
    processViolations(ctx,
            validator.validate(resource)
    );

    // validate controller method parameters
    processViolations(ctx,
            executableValidator.validateParameters(resource, method, ctx.getParameters())
    );

    // execute method
    Object result = ctx.proceed();

    // TODO: Does this make sense? Nobody will be able to handle these. Remove?
    processViolations(ctx,
            executableValidator.validateReturnValue(resource, method, result)
    );

    return result;

}
 

private static void validate(Method method, RouteDefinition definition, Validator validator, Object toInvoke, Object[] args) {

		// check method params first (if any)
		if (validator != null && args != null) {
			ExecutableValidator executableValidator = validator.forExecutables();
			Set<ConstraintViolation<Object>> result = executableValidator.validateParameters(toInvoke, method, args);
			if (result != null && result.size() > 0) {
				throw new ConstraintException(definition, result);
			}
		}
	}
 

private static void validateResult(Object result, Method method, RouteDefinition definition, Validator validator, Object toInvoke) {

		if (validator != null) {
			ExecutableValidator executableValidator = validator.forExecutables();
			Set<ConstraintViolation<Object>> validationResult = executableValidator.validateReturnValue(toInvoke, method, result);
			if (validationResult != null && validationResult.size() > 0) {
				throw new ConstraintException(definition, validationResult);
			}
		}
	}
 

@Test
public void testWorkflowTaskTestSetType() throws NoSuchMethodException {
    WorkflowTask workflowTask = createSampleWorkflowTask();

    Method method = WorkflowTask.class.getMethod("setType", String.class);
    Object[] parameterValues = {""};

    ExecutableValidator executableValidator = validator.forExecutables();

    Set<ConstraintViolation<Object>> result = executableValidator.validateParameters(workflowTask, method, parameterValues);

    assertEquals(1, result.size());
    assertEquals(result.iterator().next().getMessage(), "WorkTask type cannot be null or empty");
}
 

@AroundInvoke
public Object validateMethodInvocation(InvocationContext ctx) throws Exception {

    Object resource = ctx.getTarget();
    Method method = ctx.getMethod();

    log.log(Level.FINE, "Starting validation for controller method: {0}#{1}", new Object[]{
            resource.getClass().getName(), method.getName()
    });

    Validator validator = validatorFactory.getValidator();
    ExecutableValidator executableValidator = validator.forExecutables();

    // validate controller property parameters
    processViolations(ctx,
            validator.validate(resource)
    );

    // validate controller method parameters
    processViolations(ctx,
            executableValidator.validateParameters(resource, method, ctx.getParameters())
    );

    // execute method
    Object result = ctx.proceed();

    // TODO: Does this make sense? Nobody will be able to handle these. Remove?
    processViolations(ctx,
            executableValidator.validateReturnValue(resource, method, result)
    );

    return result;

}
 

public <T> void validate(final Method method, final Object[] arguments, final T instance) {
    if (validator == null) {
        log.warn("Bean Validation provider could not be found, no validation will be performed");
        return;
    }

    ExecutableValidator methodValidator = validator.forExecutables();
    Set<ConstraintViolation<T>> violations = methodValidator.validateParameters(instance,
            method, arguments);

    if (!violations.isEmpty()) {
        throw new ConstraintViolationException(violations);
    }
}
 

public <T> void validate(final Method method, final Object[] arguments, final T instance) {
    if (validator == null) {
        log.warn("Bean Validation provider could not be found, no validation will be performed");
        return;
    }

    ExecutableValidator methodValidator = validator.forExecutables();
    Set<ConstraintViolation<T>> violations = methodValidator.validateParameters(instance,
            method, arguments);

    if (!violations.isEmpty()) {
        throw new ConstraintViolationException(violations);
    }
}
 

private ExecutableValidator executableValidator() {
    if (null == executableValidator) {
        synchronized (this) {
            if (null == executableValidator) {
                validator = Act.getInstance(Validator.class);
                executableValidator = validator.forExecutables();
            }
        }
    }
    return executableValidator;
}
 

public <T> void validate(final Method method, final Object[] arguments, final T instance) {
        if (validator == null) {
            log.warn("Bean Validation provider could not be found, no validation will be performed");
            return;
        }

        ExecutableValidator methodValidator = validator.forExecutables();
        Set<ConstraintViolation<T>> violations = methodValidator.validateParameters(instance,
                method, arguments);

        if (!violations.isEmpty()) {
            throw new ConstraintViolationException(violations);
        }
}
 

@Override
public Object invoke(MethodInvocation invocation) throws Throwable {
    ExecutableValidator executableValidator = validatorFactory.getValidator().forExecutables();
    if (executableValidator == null) {
        throw SeedException.createNew(ValidationErrorCode.DYNAMIC_VALIDATION_IS_NOT_SUPPORTED);
    }

    validateParameters(invocation, executableValidator);
    Object returnValue = invocation.proceed();
    validateReturnValue(invocation, executableValidator, returnValue);
    return returnValue;
}
 

private void validateParameters(MethodInvocation invocation, ExecutableValidator executableValidator) {
    // validation by interception is always done with the default group
    Set<ConstraintViolation<Object>> constraintViolations = executableValidator.validateParameters(
            invocation.getThis(),
            invocation.getMethod(),
            invocation.getArguments()
    );
    if (!constraintViolations.isEmpty()) {
        throw new VerboseConstraintViolationException(constraintViolations);
    }
}
 

private void validateReturnValue(MethodInvocation invocation, ExecutableValidator executableValidator,
        Object returnValue) {
    Set<ConstraintViolation<Object>> constraintViolations = executableValidator.validateReturnValue(
            invocation.getThis(),
            invocation.getMethod(),
            returnValue
            /*, groups*/
    );
    if (!constraintViolations.isEmpty()) {
        throw new VerboseConstraintViolationException(constraintViolations);
    }
}
 

public< T > void validateParameters(final T instance, final Method method, final Object[] arguments) {

        final ExecutableValidator methodValidator = getExecutableValidator();
        final Set< ConstraintViolation< T > > violations = methodValidator.validateParameters(instance,
            method, arguments);

        if (!violations.isEmpty()) {
            throw new ConstraintViolationException(violations);
        }
    }
 

public< T > void validateReturnValue(final T instance, final Method method, final Object returnValue) {
    final ExecutableValidator methodValidator = getExecutableValidator();
    final Set<ConstraintViolation< T > > violations = methodValidator.validateReturnValue(instance,
        method, returnValue);

    if (!violations.isEmpty()) {
        throw new ResponseConstraintViolationException(violations);
    }
}
 

public static ValidationConstraints of(final Class<?> componentClass) {
    final ClassValidationData data = new ClassValidationData(componentClass);

    if (data.getJwtConstraints().size() == 0) return null;

    final Class<?> constraintsClazz = new ClassValidationGenerator(data)
            .generate()
            .stream()
            .filter(aClass -> aClass.getName().endsWith("JwtConstraints"))
            .findFirst()
            .orElseThrow(MissingConstraintsException::new);


    final Map<Method, Method> mapping = new HashMap<>();

    Stream.of(constraintsClazz.getMethods())
            .filter(method -> method.isAnnotationPresent(Generated.class))
            .forEach(method -> mapping.put(resolve(componentClass, method), method)
            );

    final Object instance;
    try {
        instance = constraintsClazz.newInstance();
    } catch (Exception e) {
        throw new ConstraintsClassInstantiationException(constraintsClazz, e);
    }

    final ExecutableValidator executableValidator = Validation.buildDefaultValidatorFactory()
            .getValidator()
            .forExecutables();

    return new ValidationConstraints(instance, mapping, executableValidator);
}
 

@Test
public void testConstructorParameters() throws NoSuchMethodException {
    ExecutableValidator executableValidator = validator.forExecutables();
    Constructor<RentalStation> constructor = RentalStation.class.getConstructor(String.class, String.class);
    Set<ConstraintViolation<RentalStation>> violations = executableValidator.validateConstructorParameters
            (constructor, new Object[] {"Hertz", ""});
    assertThat(violations.size()).isEqualTo(0);
    violations = executableValidator.validateConstructorParameters
            (constructor, new Object[] {null, ""});
    assertThat(violations.size()).isEqualTo(1);
    violations = executableValidator.validateConstructorParameters
            (constructor, new Object[] {null, null});
    assertThat(violations.size()).isEqualTo(2);
}
 

@Test
public void testConstructorParameters() throws NoSuchMethodException {
    ExecutableValidator executableValidator = validator.forExecutables();
    Constructor<RentalStation> constructor = RentalStation.class.getConstructor(String.class, String.class);
    Set<ConstraintViolation<RentalStation>> violations = executableValidator.validateConstructorParameters
            (constructor, new Object[] {"Hertz", ""});
    assertThat(violations.size()).isEqualTo(0);
    violations = executableValidator.validateConstructorParameters
            (constructor, new Object[] {null, ""});
    assertThat(violations.size()).isEqualTo(1);
    violations = executableValidator.validateConstructorParameters
            (constructor, new Object[] {null, null});
    assertThat(violations.size()).isEqualTo(2);
}
 

@Override
public ExecutableValidator forExecutables() {
	Assert.state(this.targetValidator != null, "No target Validator set");
	return this.targetValidator.forExecutables();
}
 

@Override
public ExecutableValidator forExecutables() {
	Assert.state(this.targetValidator != null, "No target Validator set");
	return this.targetValidator.forExecutables();
}
 

private List<ConstraintViolation<?>> simulateValidation(Object controller, String methodName, Object... args) {

        ValidatorFactory validatorFactory = Validation.buildDefaultValidatorFactory();

        Validator validator = validatorFactory.getValidator();
        ExecutableValidator executableValidator = validator.forExecutables();

        List<ConstraintViolation<?>> result = new ArrayList<>();

        // validate controller fields
        result.addAll(validator.validate(controller));

        // controller method parameters
        Method method = getFirstMethod(controller.getClass(), methodName);
        result.addAll(executableValidator.validateParameters(controller, method, args));

        return result;

    }
 

/**
 * {@inheritDoc}
 */
public ExecutableValidator forExecutables()
{
   return validator.forExecutables();
}
 

private List<ConstraintViolation<?>> simulateValidation(Object controller, String methodName, Object... args) {

        ValidatorFactory validatorFactory = Validation.buildDefaultValidatorFactory();

        Validator validator = validatorFactory.getValidator();
        ExecutableValidator executableValidator = validator.forExecutables();

        List<ConstraintViolation<?>> result = new ArrayList<>();

        // validate controller fields
        result.addAll(validator.validate(controller));

        // controller method parameters
        Method method = getFirstMethod(controller.getClass(), methodName);
        result.addAll(executableValidator.validateParameters(controller, method, args));

        return result;

    }