/*
* 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.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import javax.enterprise.inject.Instance;
import javax.enterprise.inject.TypeLiteral;
import javax.enterprise.inject.spi.Bean;
import org.apache.webbeans.container.InjectionResolver;
import org.apache.webbeans.container.BeanManagerImpl;
import org.apache.webbeans.container.ResolutionUtil;
import org.apache.webbeans.util.AnnotationUtil;
import org.apache.webbeans.util.ClassUtil;
/**
* Implements the {@link Instance} interface.
*
* @param <T> specific instance type
*/
class InstanceImpl<T> implements Instance<T>
{
/** Injected class type */
private Type injectionClazz;
/** Qualifier annotations appeared on the injection point */
private Set<Annotation> qualifierAnnotations = new HashSet<Annotation>();
/**
* Creates new instance.
*
* @param injectionClazz injection class type
* @param actualTypeArguments actual type arguments
* @param annotations qualifier annotations
*/
InstanceImpl(Type injectionClazz, Annotation... annotations)
{
this.injectionClazz = injectionClazz;
for (Annotation ann : annotations)
{
qualifierAnnotations.add(ann);
}
}
/**
* Returns the bean instance with given qualifier annotations.
*
* @param annotations qualifier annotations
* @return bean instance
*/
@SuppressWarnings("unchecked")
public T get()
{
T instance = null;
Annotation[] anns = new Annotation[this.qualifierAnnotations.size()];
anns = this.qualifierAnnotations.toArray(anns);
Set<Bean<?>> beans = resolveBeans();
ResolutionUtil.checkResolvedBeans(beans, ClassUtil.getClazz(this.injectionClazz),anns);
Bean<?> bean = beans.iterator().next();
instance = (T)BeanManagerImpl.getManager().getInstance(bean);
return instance;
}
/**
* Returns set of resolved beans.
*
* @return set of resolved beans
*/
private Set<Bean<?>> resolveBeans()
{
Annotation[] anns = new Annotation[this.qualifierAnnotations.size()];
anns = this.qualifierAnnotations.toArray(anns);
InjectionResolver resolver = InjectionResolver.getInstance();
Set<Bean<?>> beans = resolver.implResolveByType(this.injectionClazz, anns);
return beans;
}
/**
* {@inheritDoc}
*/
@Override
public boolean isAmbiguous()
{
Set<Bean<?>> beans = resolveBeans();
return beans.size() > 1 ? true : false;
}
/**
* {@inheritDoc}
*/
@Override
public boolean isUnsatisfied()
{
Set<Bean<?>> beans = resolveBeans();
return beans.size() == 0 ? true : false;
}
/**
* {@inheritDoc}
*/
@Override
public Instance<T> select(Annotation... qualifiers)
{
Annotation[] newQualifiersArray = getAdditionalQualifiers(qualifiers);
InstanceImpl<T> newInstance = new InstanceImpl<T>(this.injectionClazz, newQualifiersArray);
return newInstance;
}
/**
* Returns total qualifiers array
*
* @param qualifiers additional qualifiers
* @return total qualifiers array
*/
private Annotation[] getAdditionalQualifiers(Annotation[] qualifiers)
{
AnnotationUtil.checkQualifierConditions(qualifiers);
Set<Annotation> newQualifiers = new HashSet<Annotation>(this.qualifierAnnotations);
if (qualifiers != null && qualifiers.length > 0)
{
for (Annotation annot : qualifiers)
{
if (newQualifiers.contains(annot))
{
throw new IllegalArgumentException("Duplicate Qualifier Exception, " + this.toString());
}
newQualifiers.add(annot);
}
}
Annotation[] newQualifiersArray = new Annotation[newQualifiers.size()];
newQualifiersArray = newQualifiers.toArray(newQualifiersArray);
return newQualifiersArray;
}
/**
* {@inheritDoc}
*/
@Override
public <U extends T> Instance<U> select(Class<U> subtype, Annotation... qualifiers)
{
AnnotationUtil.checkQualifierConditions(qualifiers);
Type sub = subtype;
if(sub == null)
{
sub = this.injectionClazz;
}
Annotation[] newQualifiers = getAdditionalQualifiers(qualifiers);
InstanceImpl<U> newInstance = new InstanceImpl<U>(sub, newQualifiers);
return newInstance;
}
/**
* {@inheritDoc}
*/
@Override
public <U extends T> Instance<U> select(TypeLiteral<U> subtype, Annotation... qualifiers)
{
return select(subtype.getRawType(), qualifiers);
}
/**
* {@inheritDoc}
*/
@Override
@SuppressWarnings("unchecked")
public Iterator<T> iterator()
{
Set<Bean<?>> beans = resolveBeans();
Set<T> instances = new HashSet<T>();
for(Bean<?> bean : beans)
{
T instance = (T)BeanManagerImpl.getManager().getInstance(bean);
instances.add(instance);
}
return instances.iterator();
}
public String toString()
{
StringBuilder builder = new StringBuilder();
builder.append("Instance<");
builder.append(ClassUtil.getClazz(this.injectionClazz).getName());
builder.append(">");
builder.append(",with qualifier annotations {");
int i = 0;
for (Annotation qualifier : this.qualifierAnnotations)
{
if (i != 0)
{
builder.append(",");
}
builder.append(qualifier.toString());
}
builder.append("}");
return builder.toString();
}
}