/
UnwrapsExtension.java
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/
UnwrapsExtension.java
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/*
* JBoss, Home of Professional Open Source
* Copyright 2011, Red Hat, Inc. and/or its affiliates, 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.jboss.seam.solder.unwraps;
import org.jboss.logging.Logger;
import org.jboss.seam.solder.reflection.Reflections;
import javax.enterprise.event.Observes;
import javax.enterprise.inject.spi.AfterBeanDiscovery;
import javax.enterprise.inject.spi.AnnotatedMethod;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import javax.enterprise.inject.spi.Extension;
import javax.enterprise.inject.spi.ProcessAnnotatedType;
import java.lang.annotation.Annotation;
import java.util.HashSet;
import java.util.Set;
/**
* An extension that allows the use of {@link Unwraps} methods
*
*
* @author Stuart Douglas
*
*/
public class UnwrapsExtension implements Extension
{
private final Set<Bean<?>> beans;
private final static Logger log = Logger.getLogger(UnwrapsExtension.class);
private final boolean enabled;
private final Set<Throwable> problems = new HashSet<Throwable>();
public UnwrapsExtension()
{
this.beans = new HashSet<Bean<?>>();
boolean en = true;
try
{
Reflections.classForName("javassist.util.proxy.MethodHandler", UnwrapsExtension.class.getClassLoader());
}
catch (ClassNotFoundException e)
{
en = false;
log.debug("Javassist not preset, @Unwraps is disabled");
}
enabled = en;
}
void processAnnotatedType(@Observes ProcessAnnotatedType<?> type, BeanManager beanManager)
{
for (AnnotatedMethod<?> method : type.getAnnotatedType().getMethods())
{
if (method.isAnnotationPresent(Unwraps.class))
{
if (!enabled)
{
problems.add(new RuntimeException("Javassist not found on the class path, @Unwraps requires javassist to work. @Unwraps found on " + type.getAnnotatedType().getJavaClass().getName() + "." + method.getJavaMember().getName()));
}
else
{
for(Annotation annotation : method.getAnnotations())
{
if(beanManager.isScope(annotation.annotationType()))
{
problems.add(new RuntimeException("@Unwraps producer method declared a scope: " + method));
}
}
// we have a managed producer
// lets make a note of it and register it later
beans.add(createBean(method, beanManager));
}
}
}
}
private static <X> Bean<X> createBean(AnnotatedMethod<X> method, BeanManager beanManager)
{
return new UnwrapsProducerBean<X>(method, beanManager);
}
void afterBeanDiscovery(@Observes AfterBeanDiscovery afterBean)
{
for (Bean<?> b : beans)
{
afterBean.addBean(b);
}
for (Throwable e : problems)
{
afterBean.addDefinitionError(e);
}
}
}