// $Id: AnnotationFactory.java 17265 2009-08-11 19:31:41Z epbernard $
/*
* JBoss, Home of Professional Open Source
* Copyright 2008, Red Hat Middleware LLC, and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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.hibernate.validation.util.annotationfactory;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Proxy;
import java.security.AccessController;
import org.hibernate.validation.util.GetConstructor;
import org.hibernate.validation.util.GetClassLoader;
/**
* Creates live annotations (actually <code>AnnotationProxies</code>) from <code>AnnotationDescriptors</code>.
*
* @author Paolo Perrotta
* @author Davide Marchignoli
* @see AnnotationProxy
*/
public class AnnotationFactory {
@SuppressWarnings("unchecked")
public static <T extends Annotation> T create(AnnotationDescriptor<T> descriptor) {
boolean isSecured = System.getSecurityManager() != null;
GetClassLoader action = GetClassLoader.fromContext();
ClassLoader classLoader = isSecured ? AccessController.doPrivileged( action ) : action.run();
//TODO round 34ms to generate the proxy, hug! is Javassist Faster?
Class<T> proxyClass = (Class<T>) Proxy.getProxyClass( classLoader, descriptor.type() );
InvocationHandler handler = new AnnotationProxy( descriptor );
try {
return getProxyInstance( proxyClass, handler );
}
catch (RuntimeException e) {
throw e;
}
catch (Exception e) {
throw new RuntimeException( e );
}
}
private static <T extends Annotation> T getProxyInstance(Class<T> proxyClass, InvocationHandler handler) throws
SecurityException, NoSuchMethodException, IllegalArgumentException, InstantiationException,
IllegalAccessException, InvocationTargetException {
GetConstructor<T> action = GetConstructor.action( proxyClass, InvocationHandler.class );
final Constructor<T> constructor;
if ( System.getSecurityManager() != null ) {
constructor = AccessController.doPrivileged( action );
}
else {
constructor = action.run();
}
return constructor.newInstance( handler );
}
}