/*
* JBoss, Home of Professional Open Source
* Copyright 2010, Red Hat Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.as.ee.beanvalidation;
import java.util.Collections;
import java.util.List;
import javax.validation.Configuration;
import javax.validation.ConstraintValidatorFactory;
import javax.validation.MessageInterpolator;
import javax.validation.TraversableResolver;
import javax.validation.Validation;
import javax.validation.ValidationProviderResolver;
import javax.validation.Validator;
import javax.validation.ValidatorContext;
import javax.validation.ValidatorFactory;
import javax.validation.spi.ValidationProvider;
import org.hibernate.validator.HibernateValidator;
import org.hibernate.validator.HibernateValidatorConfiguration;
import org.hibernate.validator.cfg.ConstraintMapping;
/**
* This class lazily initialize the ValidatorFactory on the first usage
* One benefit is that no domain class is loaded until the
* ValidatorFactory is really needed.
* Useful to avoid loading classes before JPA is initialized
* and has enhanced its classes.
*
* @author Emmanuel Bernard
* @author Stuart Douglas
*/
public class LazyValidatorFactory implements ValidatorFactory {
private final Configuration<?> configuration;
private final ClassLoader classLoader;
private volatile ValidatorFactory delegate; //use as a barrier
/**
* Use the default ValidatorFactory creation routine
*/
public LazyValidatorFactory(ClassLoader classLoader) {
this(null, classLoader);
}
public LazyValidatorFactory(Configuration<?> configuration, ClassLoader classLoader) {
this.configuration = configuration;
this.classLoader = classLoader;
}
private ValidatorFactory getDelegate() {
ValidatorFactory result = delegate;
if (result == null) {
synchronized (this) {
result = delegate;
if (result == null) {
delegate = result = initFactory();
}
}
}
return result;
}
public Validator getValidator() {
return getDelegate().getValidator();
}
private ValidatorFactory initFactory() {
final ClassLoader oldTCCL = SecurityActions.getContextClassLoader();
try {
SecurityActions.setContextClassLoader(classLoader);
if (configuration == null) {
ConstraintMapping mapping = new ConstraintMapping();
HibernateValidatorConfiguration config = Validation.byProvider(HibernateValidator.class).providerResolver(new JbossProviderResolver()).configure();
config.addMapping(mapping);
ValidatorFactory factory = config.buildValidatorFactory();
return factory;
} else {
return configuration.buildValidatorFactory();
}
} finally {
SecurityActions.setContextClassLoader(oldTCCL);
}
}
public ValidatorContext usingContext() {
return getDelegate().usingContext();
}
public MessageInterpolator getMessageInterpolator() {
return getDelegate().getMessageInterpolator();
}
public TraversableResolver getTraversableResolver() {
return getDelegate().getTraversableResolver();
}
public ConstraintValidatorFactory getConstraintValidatorFactory() {
return getDelegate().getConstraintValidatorFactory();
}
public <T> T unwrap(Class<T> clazz) {
return getDelegate().unwrap(clazz);
}
private static final class JbossProviderResolver implements ValidationProviderResolver {
@Override
public List<ValidationProvider<?>> getValidationProviders() {
return Collections.<ValidationProvider<?>>singletonList(new HibernateValidator());
}
}
}