private static <T> Maybe<T> tryValidateBean(
T object, RegisteredType type, final RegisteredTypeLoadingContext context) {
if (object == null) return Maybe.absentNull("object is null");
if (type != null) {
if (type.getKind() != RegisteredTypeKind.BEAN)
return Maybe.absent("Validating a bean when type is " + type.getKind() + " " + type);
if (!isSubtypeOf(object.getClass(), type))
return Maybe.absent(object + " does not have all the java supertypes of " + type);
}
if (context != null) {
if (context.getExpectedKind() != null && context.getExpectedKind() != RegisteredTypeKind.BEAN)
return Maybe.absent(
"Validating a bean when constraint expected " + context.getExpectedKind());
if (context.getExpectedJavaSuperType() != null
&& !context.getExpectedJavaSuperType().isInstance(object))
return Maybe.absent(
object
+ " is not of the expected java supertype "
+ context.getExpectedJavaSuperType());
}
return Maybe.of(object);
}
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);
}
/**
* Validates that the given type matches the context (if supplied); if not satisfied. returns an
* {@link Absent} if failed with details of the error, with {@link Absent#isNull()} true if the
* object is null.
*/
public static Maybe<RegisteredType> tryValidate(
RegisteredType item, final RegisteredTypeLoadingContext constraint) {
// kept as a Maybe in case someone wants a wrapper around item validity;
// unclear what the contract should be, as this can return Maybe.Present(null)
// which is suprising, but it is more natural to callers otherwise they'll likely do a separate
// null check on the item
// (often handling null different to errors) so the Maybe.get() is redundant as they have an
// object for the input anyway.
if (item == null || constraint == null) return Maybe.ofDisallowingNull(item);
if (constraint.getExpectedKind() != null
&& !constraint.getExpectedKind().equals(item.getKind()))
return Maybe.absent(item + " is not the expected kind " + constraint.getExpectedKind());
if (constraint.getExpectedJavaSuperType() != null) {
if (!isSubtypeOf(item, constraint.getExpectedJavaSuperType())) {
return Maybe.absent(
item + " is not for the expected type " + constraint.getExpectedJavaSuperType());
}
}
return Maybe.of(item);
}
/**
* validates that the given object (required) satisfies the constraints implied by the given type
* and context object, using {@link Maybe} as the result set absent containing the error(s) if not
* satisfied. returns an {@link Absent} if failed with details of the error, with {@link
* Absent#isNull()} true if the object is null.
*/
public static <T> Maybe<T> tryValidate(
final T object,
@Nullable final RegisteredType type,
@Nullable final RegisteredTypeLoadingContext context) {
if (object == null) return Maybe.absentNull("object is null");
RegisteredTypeKind kind =
type != null ? type.getKind() : context != null ? context.getExpectedKind() : null;
if (kind == null) {
if (object instanceof AbstractBrooklynObjectSpec) kind = RegisteredTypeKind.SPEC;
else kind = RegisteredTypeKind.BEAN;
}
return new RegisteredTypeKindVisitor<Maybe<T>>() {
@Override
protected Maybe<T> visitSpec() {
return tryValidateSpec(object, type, context);
}
@Override
protected Maybe<T> visitBean() {
return tryValidateBean(object, type, context);
}
}.visit(kind);
}