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ProxyClassConstructorInjectionPointWrapper.java
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ProxyClassConstructorInjectionPointWrapper.java
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/*
* JBoss, Home of Professional Open Source
* Copyright 2008, 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;
import java.lang.annotation.Annotation;
import java.util.List;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.Bean;
import javassist.util.proxy.ProxyObject;
import org.jboss.weld.bean.proxy.BeanInstance;
import org.jboss.weld.bean.proxy.CombinedInterceptorAndDecoratorStackMethodHandler;
import org.jboss.weld.bean.proxy.ProxyFactory;
import org.jboss.weld.bean.proxy.TargetBeanInstance;
import org.jboss.weld.introspector.WeldConstructor;
import org.jboss.weld.manager.BeanManagerImpl;
/**
* A wrapper on a {@link ConstructorInjectionPoint}, to be used if a proxy subclass is instantiated instead of the
* original (e.g. because the original is an abstract {@link javax.decorator.Decorator})
* <p/>
* This is a wrapper class, it is not thread-safe and any instance of this class should be used only for temporarily
* enhancing the bean instance creation process.
*
* @author <a href="mailto:mariusb@redhat.com">Marius Bogoevici</a>
* @author <a href="mailto:ales.justin@jboss.org">Ales Justin</a>
*/
// TODO Needs equals/hashcode
// TODO Would be clearer to make this either a wrapper or not
// TODO (AJ) this needs proper cleanup!
public class ProxyClassConstructorInjectionPointWrapper<T> extends ConstructorInjectionPoint<T> {
private ConstructorInjectionPoint<T> originalConstructorInjectionPoint;
private Object decoratorDelegate = null;
private boolean decorator;
private final Bean<?> bean;
public ProxyClassConstructorInjectionPointWrapper(Bean<T> declaringBean, WeldConstructor<T> weldConstructor, ConstructorInjectionPoint<T> originalConstructorInjectionPoint) {
super(declaringBean, weldConstructor);
this.decorator = (declaringBean instanceof javax.enterprise.inject.spi.Decorator);
this.originalConstructorInjectionPoint = originalConstructorInjectionPoint;
this.bean = declaringBean;
}
@Override
public List<ParameterInjectionPoint<?, T>> getWeldParameters() {
return originalConstructorInjectionPoint.getWeldParameters();
}
@Override
protected Object[] getParameterValues(List<ParameterInjectionPoint<?, T>> parameters, Object specialVal, Class<? extends Annotation> specialParam, BeanManagerImpl manager, CreationalContext<?> creationalContext) {
Object[] parameterValues = super.getParameterValues(parameters, specialVal, specialParam, manager, creationalContext);
// Check if any of the injections are for a delegate
for (ParameterInjectionPoint<?, T> parameter : getWeldParameters()) {
if (parameter.isDelegate()) {
decoratorDelegate = parameterValues[parameter.getPosition()];
}
}
return parameterValues;
}
@Override
public T newInstance(final BeanManagerImpl manager, final CreationalContext<?> creationalContext) {
// Once the instance is created, a method handler is required regardless of whether
// an actual bean instance is known yet.
final T instance = super.newInstance(manager, creationalContext);
if (decorator) {
BeanInstance beanInstance = null;
if (decoratorDelegate != null) {
beanInstance = new TargetBeanInstance(decoratorDelegate);
}
ProxyFactory.setBeanInstance(instance, beanInstance, bean);
} else {
if (instance instanceof ProxyObject) {
((ProxyObject) instance).setHandler(new CombinedInterceptorAndDecoratorStackMethodHandler());
}
}
return instance;
}
}