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package com.sun.hk2.component;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Array;
import java.lang.reflect.Type;
import java.util.Collection;
import org.jvnet.hk2.annotations.Inject;
import org.jvnet.hk2.component.ComponentException;
import org.jvnet.hk2.component.Habitat;
import org.jvnet.hk2.component.Inhabitant;
import org.jvnet.tiger_types.Types;
/**
* InjectInjectionResolver, handles all Inject annotations
*/
public class InjectInjectionResolver extends InjectionResolver<Inject> {
final Habitat habitat;
public InjectInjectionResolver(Habitat habitat) {
super(Inject.class);
this.habitat = habitat;
}
public boolean isOptional(AnnotatedElement element, Inject annotation) {
return annotation.optional();
}
/**
* Obtains the value to inject, based on the type and {@link Inject} annotation.
*/
@Override
public <V> V getValue(Object component,
Inhabitant<?> onBehalfOf,
AnnotatedElement target,
Type genericType,
Class<V> type) throws ComponentException {
V result;
if (type.isArray()) {
result = getArrayInjectValue(habitat, component, onBehalfOf, target, genericType, type);
} else {
Inject inject = target.getAnnotation(Inject.class);
if (Types.isSubClassOf(type, Holder.class)){
result = getHolderInjectValue(habitat, component, onBehalfOf, target, genericType, type, inject);
} else {
if (habitat.isContract(type)) {
result = getServiceInjectValue(habitat, component, onBehalfOf, target, genericType, type, inject);
} else {
result = getComponentInjectValue(habitat, component, onBehalfOf, target, genericType, type, inject);
}
}
}
return validate(component, result);
}
protected <V> V getArrayInjectValue(Habitat habitat,
Object component,
Inhabitant<?> onBehalfOf,
AnnotatedElement target,
Type genericType,
Class<V> type) {
V result;
Class<?> ct = type.getComponentType();
Collection<?> instances;
if (habitat.isContract(ct)) {
instances = habitat.getAllByContract(ct);
} else {
instances = habitat.getAllByType(ct);
}
result = type.cast(instances.toArray((Object[]) Array.newInstance(ct, instances.size())));
return result;
}
protected <V> V getHolderInjectValue(Habitat habitat,
Object component,
Inhabitant<?> onBehalfOf,
AnnotatedElement target,
Type genericType,
Class<V> type,
Inject inject) throws ComponentException {
Type t = Types.getTypeArgument(((java.lang.reflect.Field) target).getGenericType(), 0);
Class<?> finalType = Types.erasure(t);
if (habitat.isContract(finalType)) {
return type.cast(habitat.getInhabitants(finalType, inject.name()));
}
try {
if (finalType.cast(component)!=null) {
return type.cast(onBehalfOf);
}
} catch(ClassCastException e) {
// ignore
}
V result = type.cast(habitat.getInhabitantByType(finalType));
return result;
}
protected <V> V getServiceInjectValue(Habitat habitat,
Object component,
Inhabitant<?> onBehalfOf,
AnnotatedElement target,
Type genericType,
Class<V> type,
Inject inject) throws ComponentException {
V result = habitat.getComponent(type, inject.name());
return result;
}
protected <V> V getComponentInjectValue(Habitat habitat,
Object component,
Inhabitant<?> onBehalfOf,
AnnotatedElement target,
Type genericType,
Class<V> type,
Inject inject) throws ComponentException {
// ideally we should check if type has @Service or @Configured
V result = habitat.getByType(type);
return result;
}
/**
* Verifies the injection does not violate any integrity rules.
*
* @param component the target component to be injected
* @param toBeInjected the injected value
*/
protected <V> V validate(Object component, V toBeInjected) {
Inhabitants.validate(component, toBeInjected); // will toss exception if there is a problem
return toBeInjected;
}
}