/**
* returns an implementation of the spec class corresponding to the given target type; for use in
* {@link BrooklynTypePlanTransformer#create(RegisteredType, RegisteredTypeLoadingContext)}
* implementations when dealing with a spec; returns null if none found
*
* @param mgmt
*/
@Beta
public static AbstractBrooklynObjectSpec<?, ?> newSpecInstance(
ManagementContext mgmt, Class<? extends BrooklynObject> targetType) throws Exception {
Class<? extends AbstractBrooklynObjectSpec<?, ?>> specType =
RegisteredTypeLoadingContexts.lookupSpecTypeForTarget(targetType);
if (specType == null) return null;
Method createMethod = specType.getMethod("create", Class.class);
return (AbstractBrooklynObjectSpec<?, ?>) createMethod.invoke(null, targetType);
}
private static <T> Maybe<T> tryValidateSpec(
T object, RegisteredType rType, final RegisteredTypeLoadingContext constraint) {
if (object == null) return Maybe.absentNull("object is null");
if (!(object instanceof AbstractBrooklynObjectSpec)) {
Maybe.absent("Found " + object + " when expecting a spec");
}
Class<?> targetType = ((AbstractBrooklynObjectSpec<?, ?>) object).getType();
if (targetType == null) {
Maybe.absent("Spec " + object + " does not have a target type");
}
if (rType != null) {
if (rType.getKind() != RegisteredTypeKind.SPEC)
Maybe.absent("Validating a spec when type is " + rType.getKind() + " " + rType);
if (!isSubtypeOf(targetType, rType))
Maybe.absent(object + " does not have all the java supertypes of " + rType);
}
if (constraint != null) {
if (constraint.getExpectedJavaSuperType() != null) {
if (!constraint.getExpectedJavaSuperType().isAssignableFrom(targetType)) {
Maybe.absent(
object
+ " does not target the expected java supertype "
+ constraint.getExpectedJavaSuperType());
}
if (constraint.getExpectedJavaSuperType().isAssignableFrom(BrooklynObjectInternal.class)) {
// don't check spec type; any spec is acceptable
} else {
@SuppressWarnings("unchecked")
Class<? extends AbstractBrooklynObjectSpec<?, ?>> specType =
RegisteredTypeLoadingContexts.lookupSpecTypeForTarget(
(Class<? extends BrooklynObject>) constraint.getExpectedJavaSuperType());
if (specType == null) {
// means a problem in our classification of spec types!
Maybe.absent(
object
+ " is returned as spec for unexpected java supertype "
+ constraint.getExpectedJavaSuperType());
}
if (!specType.isAssignableFrom(object.getClass())) {
Maybe.absent(
object
+ " is not a spec of the expected java supertype "
+ constraint.getExpectedJavaSuperType());
}
}
}
}
return Maybe.of(object);
}
