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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.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import javax.validation.Configuration;
import javax.validation.ConstraintValidatorFactory;
import javax.validation.MessageInterpolator;
import javax.validation.TraversableResolver;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorContext;
import javax.validation.ValidatorFactory;
import org.hibernate.validator.messageinterpolation.ResourceBundleMessageInterpolator;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.MessageSource;
import org.springframework.core.DefaultParameterNameDiscoverer;
import org.springframework.core.ParameterNameDiscoverer;
import org.springframework.core.io.Resource;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import org.springframework.util.CollectionUtils;
import org.springframework.util.ReflectionUtils;
/**
* This is the central class for {@code javax.validation} (JSR-303) setup
* in a Spring application context: It bootstraps a {@code javax.validation.ValidationFactory}
* and exposes it through the Spring {@link org.springframework.validation.Validator} interface
* as well as through the JSR-303 {@link javax.validation.Validator} interface and the
* {@link javax.validation.ValidatorFactory} interface itself.
*
* When talking to an instance of this bean through the Spring or JSR-303 Validator interfaces,
* you'll be talking to the default Validator of the underlying ValidatorFactory. This is very
* convenient in that you don't have to perform yet another call on the factory, assuming that
* you will almost always use the default Validator anyway. This can also be injected directly
* into any target dependency of type {@link org.springframework.validation.Validator}!
*
*
As of Spring 4.0, this class supports Bean Validation 1.0 and 1.1, with special support
* for Hibernate Validator 4.3 and 5.x (see {@link #setValidationMessageSource}).
*
*
Note that Bean Validation 1.1's {@code #forExecutables} method isn't supported: We do not
* expect that method to be called by application code; consider {@link MethodValidationInterceptor}
* instead. If you really need programmatic {@code #forExecutables} access, inject this class as
* a {@link ValidatorFactory} and call {@link #getValidator()} on it, then {@code #forExecutables}
* on the returned native {@link Validator} reference instead of directly on this class.
*
*
This class is also being used by Spring's MVC configuration namespace, in case of the
* {@code javax.validation} API being present but no explicit Validator having been configured.
*
* @author Juergen Hoeller
* @since 3.0
* @see javax.validation.ValidatorFactory
* @see javax.validation.Validator
* @see javax.validation.Validation#buildDefaultValidatorFactory()
* @see javax.validation.ValidatorFactory#getValidator()
*/
public class LocalValidatorFactoryBean extends SpringValidatorAdapter
implements ValidatorFactory, ApplicationContextAware, InitializingBean, DisposableBean {
// Bean Validation 1.1 close() method available?
private static final Method closeMethod = ClassUtils.getMethodIfAvailable(ValidatorFactory.class, "close");
@SuppressWarnings("rawtypes")
private Class providerClass;
private MessageInterpolator messageInterpolator;
private TraversableResolver traversableResolver;
private ConstraintValidatorFactory constraintValidatorFactory;
private ParameterNameDiscoverer parameterNameDiscoverer = new DefaultParameterNameDiscoverer();
private Resource[] mappingLocations;
private final Map validationPropertyMap = new HashMap();
private ApplicationContext applicationContext;
private ValidatorFactory validatorFactory;
/**
* Specify the desired provider class, if any.
* If not specified, JSR-303's default search mechanism will be used.
* @see javax.validation.Validation#byProvider(Class)
* @see javax.validation.Validation#byDefaultProvider()
*/
@SuppressWarnings("rawtypes")
public void setProviderClass(Class providerClass) {
this.providerClass = providerClass;
}
/**
* Specify a custom MessageInterpolator to use for this ValidatorFactory
* and its exposed default Validator.
*/
public void setMessageInterpolator(MessageInterpolator messageInterpolator) {
this.messageInterpolator = messageInterpolator;
}
/**
* Specify a custom Spring MessageSource for resolving validation messages,
* instead of relying on JSR-303's default "ValidationMessages.properties" bundle
* in the classpath. This may refer to a Spring context's shared "messageSource" bean,
* or to some special MessageSource setup for validation purposes only.
*
NOTE: This feature requires Hibernate Validator 4.3 or higher on the classpath.
* You may nevertheless use a different validation provider but Hibernate Validator's
* {@link ResourceBundleMessageInterpolator} class must be accessible during configuration.
*
Specify either this property or {@link #setMessageInterpolator "messageInterpolator"},
* not both. If you would like to build a custom MessageInterpolator, consider deriving from
* Hibernate Validator's {@link ResourceBundleMessageInterpolator} and passing in a
* Spring-based {@code ResourceBundleLocator} when constructing your interpolator.
* @see ResourceBundleMessageInterpolator
*/
public void setValidationMessageSource(MessageSource messageSource) {
this.messageInterpolator = HibernateValidatorDelegate.buildMessageInterpolator(messageSource);
}
/**
* Specify a custom TraversableResolver to use for this ValidatorFactory
* and its exposed default Validator.
*/
public void setTraversableResolver(TraversableResolver traversableResolver) {
this.traversableResolver = traversableResolver;
}
/**
* Specify a custom ConstraintValidatorFactory to use for this ValidatorFactory.
*
Default is a {@link SpringConstraintValidatorFactory}, delegating to the
* containing ApplicationContext for creating autowired ConstraintValidator instances.
*/
public void setConstraintValidatorFactory(ConstraintValidatorFactory constraintValidatorFactory) {
this.constraintValidatorFactory = constraintValidatorFactory;
}
/**
* Set the ParameterNameDiscoverer to use for resolving method and constructor
* parameter names if needed for message interpolation.
*
Default is a {@link org.springframework.core.DefaultParameterNameDiscoverer}.
*/
public void setParameterNameDiscoverer(ParameterNameDiscoverer parameterNameDiscoverer) {
this.parameterNameDiscoverer = parameterNameDiscoverer;
}
/**
* Specify resource locations to load XML constraint mapping files from, if any.
*/
public void setMappingLocations(Resource... mappingLocations) {
this.mappingLocations = mappingLocations;
}
/**
* Specify bean validation properties to be passed to the validation provider.
*
Can be populated with a String "value" (parsed via PropertiesEditor)
* or a "props" element in XML bean definitions.
* @see javax.validation.Configuration#addProperty(String, String)
*/
public void setValidationProperties(Properties jpaProperties) {
CollectionUtils.mergePropertiesIntoMap(jpaProperties, this.validationPropertyMap);
}
/**
* Specify bean validation properties to be passed to the validation provider as a Map.
*
Can be populated with a "map" or "props" element in XML bean definitions.
* @see javax.validation.Configuration#addProperty(String, String)
*/
public void setValidationPropertyMap(Map validationProperties) {
if (validationProperties != null) {
this.validationPropertyMap.putAll(validationProperties);
}
}
/**
* Allow Map access to the bean validation properties to be passed to the validation provider,
* with the option to add or override specific entries.
* Useful for specifying entries directly, for example via "validationPropertyMap[myKey]".
*/
public Map getValidationPropertyMap() {
return this.validationPropertyMap;
}
@Override
public void setApplicationContext(ApplicationContext applicationContext) {
this.applicationContext = applicationContext;
}
@Override
public void afterPropertiesSet() {
@SuppressWarnings({"rawtypes", "unchecked"})
Configuration configuration = (this.providerClass != null ?
Validation.byProvider(this.providerClass).configure() :
Validation.byDefaultProvider().configure());
// Try Hibernate Validator 5.2's externalClassLoader(ClassLoader) method
if (this.applicationContext != null) {
try {
Method eclMethod = configuration.getClass().getMethod("externalClassLoader", ClassLoader.class);
ReflectionUtils.invokeMethod(eclMethod, configuration, this.applicationContext.getClassLoader());
}
catch (NoSuchMethodException ex) {
// Ignore - no Hibernate Validator 5.2+ or similar provider
}
}
MessageInterpolator targetInterpolator = this.messageInterpolator;
if (targetInterpolator == null) {
targetInterpolator = configuration.getDefaultMessageInterpolator();
}
configuration.messageInterpolator(new LocaleContextMessageInterpolator(targetInterpolator));
if (this.traversableResolver != null) {
configuration.traversableResolver(this.traversableResolver);
}
ConstraintValidatorFactory targetConstraintValidatorFactory = this.constraintValidatorFactory;
if (targetConstraintValidatorFactory == null && this.applicationContext != null) {
targetConstraintValidatorFactory =
new SpringConstraintValidatorFactory(this.applicationContext.getAutowireCapableBeanFactory());
}
if (targetConstraintValidatorFactory != null) {
configuration.constraintValidatorFactory(targetConstraintValidatorFactory);
}
if (this.parameterNameDiscoverer != null) {
configureParameterNameProviderIfPossible(configuration);
}
if (this.mappingLocations != null) {
for (Resource location : this.mappingLocations) {
try {
configuration.addMapping(location.getInputStream());
}
catch (IOException ex) {
throw new IllegalStateException("Cannot read mapping resource: " + location);
}
}
}
for (Map.Entry entry : this.validationPropertyMap.entrySet()) {
configuration.addProperty(entry.getKey(), entry.getValue());
}
// Allow for custom post-processing before we actually build the ValidatorFactory.
postProcessConfiguration(configuration);
this.validatorFactory = configuration.buildValidatorFactory();
setTargetValidator(this.validatorFactory.getValidator());
}
private void configureParameterNameProviderIfPossible(Configuration configuration) {
try {
Class parameterNameProviderClass =
ClassUtils.forName("javax.validation.ParameterNameProvider", getClass().getClassLoader());
Method parameterNameProviderMethod =
Configuration.class.getMethod("parameterNameProvider", parameterNameProviderClass);
final Object defaultProvider = ReflectionUtils.invokeMethod(
Configuration.class.getMethod("getDefaultParameterNameProvider"), configuration);
final ParameterNameDiscoverer discoverer = this.parameterNameDiscoverer;
Object parameterNameProvider = Proxy.newProxyInstance(getClass().getClassLoader(),
new Class[] {parameterNameProviderClass}, new InvocationHandler() {
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if (method.getName().equals("getParameterNames")) {
String[] result = null;
if (args[0] instanceof Constructor) {
result = discoverer.getParameterNames((Constructor) args[0]);
}
else if (args[0] instanceof Method) {
result = discoverer.getParameterNames((Method) args[0]);
}
if (result != null) {
return Arrays.asList(result);
}
else {
try {
return method.invoke(defaultProvider, args);
}
catch (InvocationTargetException ex) {
throw ex.getTargetException();
}
}
}
else {
// toString, equals, hashCode
try {
return method.invoke(this, args);
}
catch (InvocationTargetException ex) {
throw ex.getTargetException();
}
}
}
});
ReflectionUtils.invokeMethod(parameterNameProviderMethod, configuration, parameterNameProvider);
}
catch (Exception ex) {
// Bean Validation 1.1 API not available - simply not applying the ParameterNameDiscoverer
}
}
/**
* Post-process the given Bean Validation configuration,
* adding to or overriding any of its settings.
* Invoked right before building the {@link ValidatorFactory}.
* @param configuration the Configuration object, pre-populated with
* settings driven by LocalValidatorFactoryBean's properties
*/
protected void postProcessConfiguration(Configuration configuration) {
}
@Override
public Validator getValidator() {
Assert.notNull(this.validatorFactory, "No target ValidatorFactory set");
return this.validatorFactory.getValidator();
}
@Override
public ValidatorContext usingContext() {
Assert.notNull(this.validatorFactory, "No target ValidatorFactory set");
return this.validatorFactory.usingContext();
}
@Override
public MessageInterpolator getMessageInterpolator() {
Assert.notNull(this.validatorFactory, "No target ValidatorFactory set");
return this.validatorFactory.getMessageInterpolator();
}
@Override
public TraversableResolver getTraversableResolver() {
Assert.notNull(this.validatorFactory, "No target ValidatorFactory set");
return this.validatorFactory.getTraversableResolver();
}
@Override
public ConstraintValidatorFactory getConstraintValidatorFactory() {
Assert.notNull(this.validatorFactory, "No target ValidatorFactory set");
return this.validatorFactory.getConstraintValidatorFactory();
}
public void close() {
if (closeMethod != null && this.validatorFactory != null) {
ReflectionUtils.invokeMethod(closeMethod, this.validatorFactory);
}
}
@Override
public void destroy() {
close();
}
/**
* Inner class to avoid a hard-coded Hibernate Validator dependency.
*/
private static class HibernateValidatorDelegate {
public static MessageInterpolator buildMessageInterpolator(MessageSource messageSource) {
return new ResourceBundleMessageInterpolator(new MessageSourceResourceBundleLocator(messageSource));
}
}
}