/*
* Copyright 2002-2009 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.util.Iterator;
import java.util.Set;
import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanInitializationException;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.config.BeanPostProcessor;
/**
* Simple {@link BeanPostProcessor} that checks JSR-303 constraint annotations
* in Spring-managed beans, throwing an initialization exception in case of
* constraint violations right before calling the bean's init method (if any).
*
* @author Juergen Hoeller
* @since 3.0
*/
public class BeanValidationPostProcessor implements BeanPostProcessor, InitializingBean {
private Validator validator;
private boolean afterInitialization = false;
/**
* Set the JSR-303 Validator to delegate to for validating beans.
* <p>Default is the default ValidatorFactory's default Validator.
*/
public void setValidator(Validator validator) {
this.validator = validator;
}
/**
* Set the JSR-303 ValidatorFactory to delegate to for validating beans,
* using its default Validator.
* <p>Default is the default ValidatorFactory's default Validator.
* @see javax.validation.ValidatorFactory#getValidator()
*/
public void setValidatorFactory(ValidatorFactory validatorFactory) {
this.validator = validatorFactory.getValidator();
}
/**
* Choose whether to perform validation after bean initialization
* (i.e. after init methods) instead of before (which is the default).
* <p>Default is "false" (before initialization). Switch this to "true"
* (after initialization) if you would like to give init methods a chance
* to populate constrained fields before they get validated.
*/
public void setAfterInitialization(boolean afterInitialization) {
this.afterInitialization = afterInitialization;
}
public void afterPropertiesSet() {
if (this.validator == null) {
this.validator = Validation.buildDefaultValidatorFactory().getValidator();
}
}
public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
if (!this.afterInitialization) {
doValidate(bean);
}
return bean;
}
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
if (this.afterInitialization) {
doValidate(bean);
}
return bean;
}
/**
* Perform validation of the given bean.
* @param bean the bean instance to validate
* @see javax.validation.Validator#validate
*/
protected void doValidate(Object bean) {
Set<ConstraintViolation<Object>> result = this.validator.validate(bean);
if (!result.isEmpty()) {
StringBuilder sb = new StringBuilder("Bean state is invalid: ");
for (Iterator<ConstraintViolation<Object>> it = result.iterator(); it.hasNext();) {
ConstraintViolation<Object> violation = it.next();
sb.append(violation.getPropertyPath()).append(" - ").append(violation.getMessage());
if (it.hasNext()) {
sb.append("; ");
}
}
throw new BeanInitializationException(sb.toString());
}
}
}
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