/*
* Copyright 2002-2018 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 javax.validation.executable.ExecutableValidator;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.SmartFactoryBean;
import org.springframework.core.BridgeMethodResolver;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.util.ClassUtils;
import org.springframework.validation.annotation.Validated;
An AOP Alliance 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.: public @NotNull Object myValidMethod(@NotNull String arg1, @Max(10) int arg2)
Validation groups can be specified through Spring's 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 5.0, this functionality requires a Bean Validation 1.1 provider.
Author: Juergen Hoeller See Also: Since: 3.1
/**
* An AOP Alliance {@link MethodInterceptor} implementation that delegates to a
* JSR-303 provider for performing method-level validation on annotated methods.
*
* <p>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).
*
* <p>E.g.: {@code public @NotNull Object myValidMethod(@NotNull String arg1, @Max(10) int arg2)}
*
* <p>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.
*
* <p>As of Spring 5.0, this functionality requires a Bean Validation 1.1 provider.
*
* @author Juergen Hoeller
* @since 3.1
* @see MethodValidationPostProcessor
* @see javax.validation.executable.ExecutableValidator
*/
public class MethodValidationInterceptor implements MethodInterceptor {
private final Validator validator;
Create a new MethodValidationInterceptor using a default JSR-303 validator underneath.
/**
* Create a new MethodValidationInterceptor using a default JSR-303 validator underneath.
*/
public MethodValidationInterceptor() {
this(Validation.buildDefaultValidatorFactory());
}
Create a new MethodValidationInterceptor using the given JSR-303 ValidatorFactory.
Params: - validatorFactory – the JSR-303 ValidatorFactory to use
/**
* 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.
Params: - validator – the JSR-303 Validator to use
/**
* 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 {
// 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;
}
private boolean isFactoryBeanMetadataMethod(Method method) {
Class<?> clazz = method.getDeclaringClass();
// Call from interface-based proxy handle, allowing for an efficient check?
if (clazz.isInterface()) {
return ((clazz == FactoryBean.class || clazz == SmartFactoryBean.class) &&
!method.getName().equals("getObject"));
}
// Call from CGLIB proxy handle, potentially implementing a FactoryBean method?
Class<?> factoryBeanType = null;
if (SmartFactoryBean.class.isAssignableFrom(clazz)) {
factoryBeanType = SmartFactoryBean.class;
}
else if (FactoryBean.class.isAssignableFrom(clazz)) {
factoryBeanType = FactoryBean.class;
}
return (factoryBeanType != null && !method.getName().equals("getObject") &&
ClassUtils.hasMethod(factoryBeanType, method.getName(), method.getParameterTypes()));
}
Determine the validation groups to validate against for the given method invocation.
Default are the validation groups as specified in the Validated annotation on the containing target class of the method.
Params: - invocation – the current MethodInvocation
Returns: the applicable validation groups as a Class array
/**
* Determine the validation groups to validate against for the given method invocation.
* <p>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]);
}
}