/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.webbeans.inject.instance;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.Instance;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.util.TypeLiteral;
import org.apache.webbeans.config.WebBeansContext;
import org.apache.webbeans.container.BeanManagerImpl;
import org.apache.webbeans.container.InjectionResolver;
import org.apache.webbeans.context.creational.CreationalContextImpl;
import org.apache.webbeans.util.ClassUtil;
import org.apache.webbeans.util.OwbCustomObjectInputStream;
import org.apache.webbeans.util.WebBeansUtil;
/**
* Implements the {@link Instance} interface.
*
* @param <T> specific instance type
*/
class InstanceImpl<T> implements Instance<T>, Serializable
{
private static final long serialVersionUID = -8401944412490389024L;
/** Injected class type */
private Type injectionClazz;
/**
* injection point class used to determine the BDA it was loaded from or null.
*/
private Class<?> injectionPointClazz;
/** Qualifier annotations appeared on the injection point */
private Set<Annotation> qualifierAnnotations = new HashSet<Annotation>();
private WebBeansContext webBeansContext;
private CreationalContext<?> parentCreationalContext;
private Object ownerInstance;
/**
* Creates new instance.
*
* @param injectionClazz injection class type
* @param injectionPointClazz null or class of injection point
* @param webBeansContext
* @param creationalContext will get used for creating @Dependent beans
* @param ownerInstance the object the current Instance got injected into
* @param annotations qualifier annotations
*/
InstanceImpl(Type injectionClazz, Class<?> injectionPointClazz, WebBeansContext webBeansContext,
CreationalContext<?> creationalContext, Object ownerInstance, Annotation... annotations)
{
this.injectionClazz = injectionClazz;
this.injectionPointClazz=injectionPointClazz;
this.parentCreationalContext = creationalContext;
this.ownerInstance = ownerInstance;
for (Annotation ann : annotations)
{
qualifierAnnotations.add(ann);
}
this.webBeansContext = webBeansContext;
}
/**
* Returns the bean instance with given qualifier annotations.
*
* @return bean instance
*/
@SuppressWarnings("unchecked")
public T get()
{
T instance;
Annotation[] anns = new Annotation[qualifierAnnotations.size()];
anns = qualifierAnnotations.toArray(anns);
Set<Bean<?>> beans = resolveBeans();
webBeansContext.getResolutionUtil().checkResolvedBeans(beans, ClassUtil.getClazz(injectionClazz), anns, null);
BeanManagerImpl beanManager = webBeansContext.getBeanManagerImpl();
Bean<?> bean = beanManager.resolve(beans);
// since Instance<T> is Dependent, we we gonna use the parent CreationalContext by default
CreationalContext<?> creationalContext = parentCreationalContext;
boolean isDependentBean = WebBeansUtil.isDependent(bean);
if (!isDependentBean)
{
// but for all NormalScoped beans we will need to create a fresh CreationalContext
creationalContext = beanManager.createCreationalContext(bean);
}
instance = (T) beanManager.getReference(bean, null, creationalContext);
if (isDependentBean && ownerInstance != null && creationalContext instanceof CreationalContextImpl)
{
((CreationalContextImpl<?>) creationalContext).addDependent(ownerInstance, bean, instance);
}
return instance;
}
/**
* Returns set of resolved beans.
*
* @return set of resolved beans
*/
private Set<Bean<?>> resolveBeans()
{
Annotation[] anns = new Annotation[qualifierAnnotations.size()];
anns = qualifierAnnotations.toArray(anns);
InjectionResolver injectionResolver = webBeansContext.getBeanManagerImpl().getInjectionResolver();
InjectionResolver resolver = injectionResolver;
Set<Bean<?>> beans = resolver.implResolveByType(injectionClazz, injectionPointClazz, anns);
return beans;
}
/**
* {@inheritDoc}
*/
public boolean isAmbiguous()
{
Set<Bean<?>> beans = resolveBeans();
return beans.size() > 1 ? true : false;
}
/**
* {@inheritDoc}
*/
public boolean isUnsatisfied()
{
Set<Bean<?>> beans = resolveBeans();
return beans.size() == 0 ? true : false;
}
/**
* {@inheritDoc}
*/
public Instance<T> select(Annotation... qualifiers)
{
Annotation[] newQualifiersArray = getAdditionalQualifiers(qualifiers);
InstanceImpl<T> newInstance = new InstanceImpl<T>(injectionClazz, injectionPointClazz,
webBeansContext, parentCreationalContext,
ownerInstance, newQualifiersArray);
return newInstance;
}
/**
* Returns total qualifiers array
*
* @param qualifiers additional qualifiers
* @return total qualifiers array
*/
private Annotation[] getAdditionalQualifiers(Annotation[] qualifiers)
{
webBeansContext.getAnnotationManager().checkQualifierConditions(qualifiers);
Set<Annotation> newQualifiers = new HashSet<Annotation>(qualifierAnnotations);
if (qualifiers != null && qualifiers.length > 0)
{
for (Annotation annot : qualifiers)
{
if (newQualifiers.contains(annot))
{
throw new IllegalArgumentException("Duplicate Qualifier Exception, " + toString());
}
newQualifiers.add(annot);
}
}
Annotation[] newQualifiersArray = new Annotation[newQualifiers.size()];
newQualifiersArray = newQualifiers.toArray(newQualifiersArray);
return newQualifiersArray;
}
/**
* {@inheritDoc}
*/
public <U extends T> Instance<U> select(Class<U> subtype, Annotation... qualifiers)
{
webBeansContext.getAnnotationManager().checkQualifierConditions(qualifiers);
Type sub = subtype;
if(sub == null)
{
sub = injectionClazz;
}
Annotation[] newQualifiers = getAdditionalQualifiers(qualifiers);
InstanceImpl<U> newInstance = new InstanceImpl(sub, injectionPointClazz, webBeansContext,
parentCreationalContext, ownerInstance,
newQualifiers);
return newInstance;
}
/**
* {@inheritDoc}
*/
public <U extends T> Instance<U> select(TypeLiteral<U> subtype, Annotation... qualifiers)
{
return select(subtype.getRawType(), qualifiers);
}
/**
* {@inheritDoc}
*/
@SuppressWarnings("unchecked")
public Iterator<T> iterator()
{
Set<Bean<?>> beans = resolveBeans();
Set<T> instances = new HashSet<T>();
for(Bean<?> bean : beans)
{
T instance = (T) webBeansContext.getBeanManagerImpl().getReference(bean,null, parentCreationalContext);
instances.add(instance);
}
return instances.iterator();
}
private void writeObject(java.io.ObjectOutputStream op) throws IOException
{
ObjectOutputStream oos = new ObjectOutputStream(op);
oos.writeObject(injectionClazz);
oos.writeObject(qualifierAnnotations);
oos.writeObject(injectionPointClazz);
oos.flush();
}
private void readObject(java.io.ObjectInputStream in) throws IOException, ClassNotFoundException
{
webBeansContext = WebBeansContext.currentInstance();
final ObjectInputStream inputStream = new OwbCustomObjectInputStream(in, WebBeansUtil.getCurrentClassLoader());
injectionClazz = (Type)inputStream.readObject();
qualifierAnnotations = (Set<Annotation>)inputStream.readObject();
injectionPointClazz = (Class<?>) inputStream.readObject();
}
public String toString()
{
StringBuilder builder = new StringBuilder();
builder.append("Instance<");
builder.append(ClassUtil.getClazz(injectionClazz).getName());
builder.append("> injectionPointClazz=").append(injectionPointClazz);
builder.append(",with qualifier annotations {");
int i = 0;
for (Annotation qualifier : qualifierAnnotations)
{
if (i != 0)
{
builder.append(",");
}
builder.append(qualifier.toString());
}
builder.append("}");
return builder.toString();
}
}