package org.jboss.seam.solder.bean;
import static org.jboss.seam.solder.reflection.Reflections.isSerializable;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import javax.enterprise.context.Dependent;
import javax.enterprise.inject.Produces;
import javax.enterprise.inject.spi.AnnotatedMethod;
import javax.enterprise.inject.spi.AnnotatedParameter;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import javax.enterprise.inject.spi.InjectionPoint;
import javax.inject.Inject;
/**
* A set of utility methods for working with beans.
*
* @author Pete Muir
*
*/
public class Beans
{
private Beans()
{
}
/**
* Extract the qualifiers from a set of annotations.
*
* @param beanManager the beanManager to use to determine if an annotation is
* a qualifier
* @param annotations the annotations to check
* @return any qualifiers present in <code>annotations</code>
*/
public static Set<Annotation> getQualifiers(BeanManager beanManager, Iterable<Annotation>... annotations)
{
Set<Annotation> qualifiers = new HashSet<Annotation>();
for (Iterable<Annotation> annotationSet : annotations)
{
for (Annotation annotation : annotationSet)
{
if (beanManager.isQualifier(annotation.annotationType()))
{
qualifiers.add(annotation);
}
}
}
return qualifiers;
}
/**
* Extract the qualifiers from a set of annotations.
*
* @param beanManager the beanManager to use to determine if an annotation is
* a qualifier
* @param annotations the annotations to check
* @return any qualifiers present in <code>annotations</code>
*/
@SuppressWarnings("unchecked")
public static Set<Annotation> getQualifiers(BeanManager beanManager, Iterable<Annotation> annotations)
{
return getQualifiers(beanManager, new Iterable[] {annotations});
}
/**
* Extract the qualifiers from a set of annotations.
*
* @param beanManager the beanManager to use to determine if an annotation is
* a qualifier
* @param annotations the annotations to check
* @return any qualifiers present in <code>annotations</code>
*/
public static Set<Annotation> getQualifiers(BeanManager beanManager, Annotation[]... annotations)
{
Set<Annotation> qualifiers = new HashSet<Annotation>();
for (Annotation[] annotationArray : annotations)
{
for (Annotation annotation : annotationArray)
{
if (beanManager.isQualifier(annotation.annotationType()))
{
qualifiers.add(annotation);
}
}
}
return qualifiers;
}
public static void checkReturnValue(Object instance, Bean<?> bean, InjectionPoint injectionPoint, BeanManager beanManager)
{
if (instance == null && !Dependent.class.equals(bean.getScope()))
{
throw new IllegalStateException("Cannot return null from a non-dependent producer method: " + bean);
}
else if (instance != null)
{
boolean passivating = beanManager.isPassivatingScope(bean.getScope());
boolean instanceSerializable = isSerializable(instance.getClass());
if (passivating && !instanceSerializable)
{
throw new IllegalStateException("Producers cannot declare passivating scope and return a non-serializable class: " + bean);
}
if (injectionPoint != null && injectionPoint.getBean() != null)
{
if (!instanceSerializable && beanManager.isPassivatingScope(injectionPoint.getBean().getScope()))
{
if (injectionPoint.getMember() instanceof Field)
{
if (!injectionPoint.isTransient() && instance != null && !instanceSerializable)
{
throw new IllegalStateException("Producers cannot produce non-serializable instances for injection into non-transient fields of passivating beans. Producer " + bean + "at injection point " + injectionPoint);
}
}
else if (injectionPoint.getMember() instanceof Method)
{
Method method = (Method) injectionPoint.getMember();
if (method.isAnnotationPresent(Inject.class))
{
throw new IllegalStateException("Producers cannot produce non-serializable instances for injection into parameters of initializers of beans declaring passivating scope. Producer " + bean + "at injection point " + injectionPoint);
}
if (method.isAnnotationPresent(Produces.class))
{
throw new IllegalStateException("Producers cannot produce non-serializable instances for injection into parameters of producer methods declaring passivating scope. Producer " + bean + "at injection point " + injectionPoint);
}
}
else if (injectionPoint.getMember() instanceof Constructor<?>)
{
throw new IllegalStateException("Producers cannot produce non-serializable instances for injection into parameters of constructors of beans declaring passivating scope. Producer " + bean + "at injection point " + injectionPoint);
}
}
}
}
}
/**
* Given a method, and the bean on which the method is declared, create a
* collection of injection points representing the parameters of the method.
*
* @param <X> the type declaring the method
* @param method the method
* @param declaringBean the bean on which the method is declared
* @param beanManager the bean manager to use to create the injection points
* @return the injection points
*/
public static <X> List<InjectionPoint> createInjectionPoints(AnnotatedMethod<X> method, Bean<?> declaringBean, BeanManager beanManager)
{
List<InjectionPoint> injectionPoints = new ArrayList<InjectionPoint>();
for (AnnotatedParameter<X> parameter : method.getParameters())
{
InjectionPoint injectionPoint = new ImmutableInjectionPoint(parameter, beanManager, declaringBean, false, false);
injectionPoints.add(injectionPoint);
}
return injectionPoints;
}
}