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/*
* Copyright 2002-2015 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.validation.beanvalidation;
import java.lang.reflect.Method;
import java.util.Set;
import javax.validation.ConstraintViolation;
import javax.validation.ConstraintViolationException;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.hibernate.validator.HibernateValidator;
import org.springframework.core.BridgeMethodResolver;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.util.ClassUtils;
import org.springframework.util.ReflectionUtils;
import org.springframework.validation.annotation.Validated;
/**
* An AOP Alliance {@link MethodInterceptor} implementation that delegates to a
* JSR-303 provider for performing method-level validation on annotated methods.
*
* Applicable methods have JSR-303 constraint annotations on their parameters
* and/or on their return value (in the latter case specified at the method level,
* typically as inline annotation).
*
*
E.g.: {@code public @NotNull Object myValidMethod(@NotNull String arg1, @Max(10) int arg2)}
*
*
Validation groups can be specified through Spring's {@link Validated} annotation
* at the type level of the containing target class, applying to all public service methods
* of that class. By default, JSR-303 will validate against its default group only.
*
*
As of Spring 4.0, this functionality requires either a Bean Validation 1.1 provider
* (such as Hibernate Validator 5.x) or the Bean Validation 1.0 API with Hibernate Validator
* 4.3. The actual provider will be autodetected and automatically adapted.
*
* @author Juergen Hoeller
* @since 3.1
* @see MethodValidationPostProcessor
* @see javax.validation.executable.ExecutableValidator
* @see org.hibernate.validator.method.MethodValidator
*/
public class MethodValidationInterceptor implements MethodInterceptor {
private static Method forExecutablesMethod;
private static Method validateParametersMethod;
private static Method validateReturnValueMethod;
static {
try {
forExecutablesMethod = Validator.class.getMethod("forExecutables");
Class executableValidatorClass = forExecutablesMethod.getReturnType();
validateParametersMethod = executableValidatorClass.getMethod(
"validateParameters", Object.class, Method.class, Object[].class, Class[].class);
validateReturnValueMethod = executableValidatorClass.getMethod(
"validateReturnValue", Object.class, Method.class, Object.class, Class[].class);
}
catch (Exception ex) {
// Bean Validation 1.1 ExecutableValidator API not available
}
}
private final Validator validator;
/**
* Create a new MethodValidationInterceptor using a default JSR-303 validator underneath.
*/
public MethodValidationInterceptor() {
this(forExecutablesMethod != null ? Validation.buildDefaultValidatorFactory() :
HibernateValidatorDelegate.buildValidatorFactory());
}
/**
* Create a new MethodValidationInterceptor using the given JSR-303 ValidatorFactory.
* @param validatorFactory the JSR-303 ValidatorFactory to use
*/
public MethodValidationInterceptor(ValidatorFactory validatorFactory) {
this(validatorFactory.getValidator());
}
/**
* Create a new MethodValidationInterceptor using the given JSR-303 Validator.
* @param validator the JSR-303 Validator to use
*/
public MethodValidationInterceptor(Validator validator) {
this.validator = validator;
}
@Override
@SuppressWarnings("unchecked")
public Object invoke(MethodInvocation invocation) throws Throwable {
Class[] groups = determineValidationGroups(invocation);
if (forExecutablesMethod != null) {
// Standard Bean Validation 1.1 API
Object execVal = ReflectionUtils.invokeMethod(forExecutablesMethod, this.validator);
Method methodToValidate = invocation.getMethod();
Set> result;
try {
result = (Set>) ReflectionUtils.invokeMethod(validateParametersMethod,
execVal, 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 = (Set>) ReflectionUtils.invokeMethod(validateParametersMethod,
execVal, invocation.getThis(), methodToValidate, invocation.getArguments(), groups);
}
if (!result.isEmpty()) {
throw new ConstraintViolationException(result);
}
Object returnValue = invocation.proceed();
result = (Set>) ReflectionUtils.invokeMethod(validateReturnValueMethod,
execVal, invocation.getThis(), methodToValidate, returnValue, groups);
if (!result.isEmpty()) {
throw new ConstraintViolationException(result);
}
return returnValue;
}
else {
// Hibernate Validator 4.3's native API
return HibernateValidatorDelegate.invokeWithinValidation(invocation, this.validator, groups);
}
}
/**
* Determine the validation groups to validate against for the given method invocation.
* Default are the validation groups as specified in the {@link Validated} annotation
* on the containing target class of the method.
* @param invocation the current MethodInvocation
* @return the applicable validation groups as a Class array
*/
protected Class[] determineValidationGroups(MethodInvocation invocation) {
Validated validatedAnn = AnnotationUtils.findAnnotation(invocation.getMethod(), Validated.class);
if (validatedAnn == null) {
validatedAnn = AnnotationUtils.findAnnotation(invocation.getThis().getClass(), Validated.class);
}
return (validatedAnn != null ? validatedAnn.value() : new Class[0]);
}
/**
* Inner class to avoid a hard-coded Hibernate Validator 4.3 dependency.
*/
private static class HibernateValidatorDelegate {
public static ValidatorFactory buildValidatorFactory() {
return Validation.byProvider(HibernateValidator.class).configure().buildValidatorFactory();
}
@SuppressWarnings("deprecation")
public static Object invokeWithinValidation(MethodInvocation invocation, Validator validator, Class[] groups)
throws Throwable {
org.hibernate.validator.method.MethodValidator methodValidator =
validator.unwrap(org.hibernate.validator.method.MethodValidator.class);
Set> result =
methodValidator.validateAllParameters(
invocation.getThis(), invocation.getMethod(), invocation.getArguments(), groups);
if (!result.isEmpty()) {
throw new org.hibernate.validator.method.MethodConstraintViolationException(result);
}
Object returnValue = invocation.proceed();
result = methodValidator.validateReturnValue(
invocation.getThis(), invocation.getMethod(), returnValue, groups);
if (!result.isEmpty()) {
throw new org.hibernate.validator.method.MethodConstraintViolationException(result);
}
return returnValue;
}
}
}