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Kernel for Resin Java Application Server
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/*
* Copyright (c) 1998-2012 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.config.inject;
import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.Type;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Set;
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 javax.inject.Qualifier;
import javax.interceptor.Interceptor;
import com.caucho.config.ConfigException;
import com.caucho.config.bytecode.DecoratorAdapter;
import com.caucho.config.reflect.AnnotatedTypeUtil;
import com.caucho.config.reflect.BaseType;
import com.caucho.inject.Module;
import com.caucho.util.L10N;
/**
* DecoratorBean represents a Java decorator
*/
@Module
public class DecoratorBean implements Decorator
{
private static final L10N L = new L10N(DecoratorBean.class);
private Class _selfType;
private Class _adapterType;
private Bean _bean;
private InjectionPoint _delegateInjectionPoint;
private Field _delegateField;
private Method _delegateMethod;
private Constructor _delegateConstructor;
private Set _typeSet;
private HashSet _qualifiers
= new HashSet();
public DecoratorBean(InjectManager beanManager,
Class type)
{
_selfType = type;
type = DecoratorAdapter.create(type);
_adapterType = type;
_bean = beanManager.createManagedBean(type);
// init();
}
//
// metadata for the bean
//
/**
* Returns the bean's binding types
*/
@Override
public Set getQualifiers()
{
if (_delegateInjectionPoint != null)
return _delegateInjectionPoint.getQualifiers();
else
return _qualifiers;
// return _bean.getQualifiers();
}
/**
* Returns the bean's deployment type
*/
@Override
public Set> getStereotypes()
{
return _bean.getStereotypes();
}
/**
* Returns the bean's name or null if the bean does not have a
* primary name.
*/
@Override
public String getName()
{
return _bean.getName();
}
/**
* Returns true if the bean can be null
*/
@Override
public boolean isNullable()
{
return true;
}
/**
* Returns true if the bean can be null
*/
@Override
public boolean isAlternative()
{
return false;
}
/**
* Returns the bean's scope
*/
@Override
public Class getScope()
{
return _bean.getScope();
}
/**
* Returns the types that the bean implements
*/
@Override
public Set getTypes()
{
return _bean.getTypes();
}
/**
* Returns the types for the decorated
*/
@Override
public Set getDecoratedTypes()
{
return _typeSet;
}
//
// lifecycle
//
@Override
public T create(CreationalContext creationalContext)
{
return _bean.create(creationalContext);
}
/**
* Returns the set of injection points, for validation.
*/
@Override
public Set getInjectionPoints()
{
if (_delegateInjectionPoint != null)
bind();
return _bean.getInjectionPoints();
}
@Override
public Class getBeanClass()
{
return _bean.getBeanClass();
}
//
// decorator
//
/**
* Returns the type of the delegated object
*/
@Override
public Type getDelegateType()
{
if (_delegateInjectionPoint == null)
bind();
return _delegateInjectionPoint.getType();
}
/**
* Returns the bindings for the delegated object
*/
@Override
public Set getDelegateQualifiers()
{
if (_delegateInjectionPoint != null)
return _delegateInjectionPoint.getQualifiers();
else
return _qualifiers;
}
public InjectionPoint getDelegateInjectionPoint()
{
if (_delegateInjectionPoint != null)
bind();
return _delegateInjectionPoint;
}
public void bind()
{
if (_delegateInjectionPoint != null)
return;
// _bean.init();
introspect();
if (_delegateField == null
&& _delegateMethod == null
&& _delegateConstructor == null)
throw new ConfigException(L.l("{0} is missing a @Delegate field. All @Decorators need a @Delegate field for a delegate injection",
_adapterType.getName()));
if (_adapterType.isAnnotationPresent(Interceptor.class))
throw new ConfigException(L.l("{0} is an invalid @Delegate because it has an @Interceptor annotation.",
_adapterType.getName()));
if (Modifier.isFinal(_adapterType.getModifiers())) {
throw new ConfigException(L.l("{0} is an invalid @Decorator because it is a final class.",
_adapterType.getName()));
}
}
protected void introspect()
{
// introspectDelegateField();
for (InjectionPoint ip : _bean.getInjectionPoints()) {
if (ip.isDelegate()) {
if (_delegateInjectionPoint != null)
throw new ConfigException(L.l("{0}: @Decorator field '{1}' conflicts with earlier field '{2}'."
+ " A decorator must have exactly one delegate field.",
ip.getBean().getBeanClass().getName(),
ip.getMember().getName(),
_delegateInjectionPoint.getMember().getName()));
_delegateInjectionPoint = ip;
}
}
if (_delegateInjectionPoint != null) {
if (_delegateInjectionPoint.getMember() instanceof Field) {
_delegateField = (Field) _delegateInjectionPoint.getMember();
_delegateField.setAccessible(true);
}
else if (_delegateInjectionPoint.getMember() instanceof Method) {
_delegateMethod = (Method) _delegateInjectionPoint.getMember();
_delegateMethod.setAccessible(true);
}
else if (_delegateInjectionPoint.getMember() instanceof Constructor) {
_delegateConstructor = (Constructor) _delegateInjectionPoint.getMember();
_delegateConstructor.setAccessible(true);
}
InjectManager manager = InjectManager.getCurrent();
BaseType selfType = manager.createTargetBaseType(_selfType);
BaseType delegateType
= manager.createSourceBaseType(_delegateInjectionPoint.getType());
_typeSet = new LinkedHashSet();
for (Type type : selfType.getTypeClosure(manager)) {
BaseType baseType = manager.createSourceBaseType(type);
if (! baseType.getRawClass().isInterface())
continue;
if (baseType.getRawClass().equals(Serializable.class))
continue;
// ioc/0i5g, ioc/0i3r
if (baseType.isAssignableFrom(delegateType)) {
_typeSet.add(type);
for (Method method : baseType.getRawClass().getMethods()) {
Method implMethod = AnnotatedTypeUtil.findMethod(selfType.getRawClass().getMethods(), method);
if (implMethod != null && Modifier.isFinal(implMethod.getModifiers())) {
throw new ConfigException(L.l("'{0}.{1}' is an invalid decorator method because it is final.",
implMethod.getDeclaringClass().getName(),
implMethod.getName()));
}
}
}
else if (isDeclaredInterface(selfType, baseType)){
// ioc/0i5a
// only types declared directly are errors
throw new ConfigException(L.l("{0}: '{1}' is a Decorator type not implemented by the delegate {2}",
_selfType.getName(), baseType, delegateType));
}
else {
// ioc/0i3r
_typeSet.add(type);
}
}
}
}
private boolean isDeclaredInterface(BaseType selfType, BaseType baseType)
{
for (Class iface : selfType.getRawClass().getInterfaces()) {
if (iface.equals(baseType.getRawClass()))
return true;
}
return false;
}
protected void introspectBindingTypes(Annotation []annList)
{
for (Annotation ann : annList) {
if (ann.annotationType().isAnnotationPresent(Qualifier.class)) {
_qualifiers.add(ann);
}
}
if (_qualifiers.size() == 0)
_qualifiers.add(DefaultLiteral.DEFAULT);
}
/**
* Instantiate the bean.
*/
public T instantiate()
{
throw new UnsupportedOperationException(getClass().getName());
}
/**
* Call destroy
*/
@Override
public void destroy(T instance, CreationalContext env)
{
_bean.destroy(instance, env);
}
@Override
public String toString()
{
StringBuilder sb = new StringBuilder();
sb.append(getClass().getSimpleName());
sb.append("[");
sb.append(_adapterType.getSimpleName());
if (_delegateField != null)
sb.append(",").append(_delegateField.getType().getSimpleName());
sb.append("]");
return sb.toString();
}
}