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* JBoss, Home of Professional Open Source
* Copyright 2012, Red Hat, Inc., 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.weld.injection.producer;
import java.util.List;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.Decorator;
import javax.enterprise.inject.spi.InjectionPoint;
import org.jboss.weld.bean.proxy.CombinedInterceptorAndDecoratorStackMethodHandler;
import org.jboss.weld.bean.proxy.DecorationHelper;
import org.jboss.weld.bean.proxy.ProxyFactory;
import org.jboss.weld.bean.proxy.ProxyObject;
import org.jboss.weld.bean.proxy.TargetBeanInstance;
import org.jboss.weld.exceptions.WeldException;
import org.jboss.weld.injection.CurrentInjectionPoint;
import org.jboss.weld.logging.BeanLogger;
import org.jboss.weld.manager.BeanManagerImpl;
import org.jboss.weld.serialization.spi.ContextualStore;
/**
* Common functionality for an instantiator capable of applying decorators to a given instance.
*
* @author Jozef Hartinger
*
* @see SubclassDecoratorApplyingInstantiator
* @see ProxyDecoratorApplyingSessionBeanInstantiator
*/
public abstract class AbstractDecoratorApplyingInstantiator<T> extends ForwardingInstantiator<T> {
private final Bean<T> bean;
private final Class<T> proxyClass;
private final List<Decorator<?>> decorators;
public AbstractDecoratorApplyingInstantiator(String contextId, Instantiator<T> delegate, Bean<T> bean, List<Decorator<?>> decorators, Class<? extends T> implementationClass) {
super(delegate);
this.bean = bean;
this.decorators = decorators;
ProxyFactory<T> factory = new ProxyFactory<T>(contextId, implementationClass, bean.getTypes(), bean, true);
// eagerly generate the proxy class
this.proxyClass = factory.getProxyClass();
}
@Override
public T newInstance(CreationalContext<T> ctx, BeanManagerImpl manager) {
InjectionPoint originalInjectionPoint = manager.getServices().get(CurrentInjectionPoint.class).peek();
return applyDecorators(delegate().newInstance(ctx, manager), ctx, originalInjectionPoint, manager);
}
protected abstract T applyDecorators(T instance, CreationalContext<T> creationalContext, InjectionPoint originalInjectionPoint, BeanManagerImpl manager);
protected T getOuterDelegate(T instance, CreationalContext<T> creationalContext, InjectionPoint originalInjectionPoint, BeanManagerImpl manager) {
TargetBeanInstance beanInstance = new TargetBeanInstance(bean, instance);
DecorationHelper<T> decorationHelper = new DecorationHelper<T>(beanInstance, bean, proxyClass, manager, manager.getServices().get(ContextualStore.class), decorators);
DecorationHelper.push(decorationHelper);
try {
final T outerDelegate = decorationHelper.getNextDelegate(originalInjectionPoint, creationalContext);
if (outerDelegate == null) {
throw new WeldException(BeanLogger.LOG.proxyInstantiationFailed(this));
}
return outerDelegate;
} finally {
DecorationHelper.pop();
}
}
protected void registerOuterDecorator(ProxyObject instance, T outerDelegate) {
CombinedInterceptorAndDecoratorStackMethodHandler wrapperMethodHandler = (CombinedInterceptorAndDecoratorStackMethodHandler) instance.getHandler();
wrapperMethodHandler.setOuterDecorator(outerDelegate);
}
public Bean<T> getBean() {
return bean;
}
public Class<T> getProxyClass() {
return proxyClass;
}
public List<Decorator<?>> getDecorators() {
return decorators;
}
@Override
public boolean hasDecoratorSupport() {
return true;
}
}