@SuppressWarnings("unchecked")
static <T> Expression<T> toExpressionRecursively(From<?, ?> from, PropertyPath property) {
Bindable<?> propertyPathModel = null;
if (from.getModel() instanceof ManagedType) {
/*
* Avoid calling from.get(...) because this triggers the generation of an inner-join instead
* of and outer-join in eclipse-link.
* See: https://bugs.eclipse.org/bugs/show_bug.cgi?id=413892
*/
propertyPathModel =
(Bindable<?>) ((ManagedType<?>) from.getModel()).getAttribute(property.getSegment());
} else {
propertyPathModel = from.get(property.getSegment()).getModel();
}
if (property.isCollection() || requiresJoin(propertyPathModel)) {
Join<?, ?> join = getOrCreateJoin(from, property.getSegment());
return (Expression<T>)
(property.hasNext() ? toExpressionRecursively(join, property.next()) : join);
} else {
Path<Object> path = from.get(property.getSegment());
return (Expression<T>)
(property.hasNext() ? toExpressionRecursively(path, property.next()) : path);
}
}
@SuppressWarnings("unchecked")
static <T> Expression<T> toExpressionRecursively(From<?, ?> from, PropertyPath property) {
Bindable<?> propertyPathModel = null;
Bindable<?> model = from.getModel();
String segment = property.getSegment();
if (model instanceof ManagedType) {
/*
* Required to keep support for EclipseLink 2.4.x. TODO: Remove once we drop that (probably Dijkstra M1)
* See: https://bugs.eclipse.org/bugs/show_bug.cgi?id=413892
*/
propertyPathModel = (Bindable<?>) ((ManagedType<?>) model).getAttribute(segment);
} else {
propertyPathModel = from.get(segment).getModel();
}
if (requiresJoin(propertyPathModel, model instanceof PluralAttribute)
&& !isAlreadyFetched(from, segment)) {
Join<?, ?> join = getOrCreateJoin(from, segment);
return (Expression<T>)
(property.hasNext() ? toExpressionRecursively(join, property.next()) : join);
} else {
Path<Object> path = from.get(segment);
return (Expression<T>)
(property.hasNext() ? toExpressionRecursively(path, property.next()) : path);
}
}
static Expression<Object> toExpressionRecursively(Path<Object> path, PropertyPath property) {
Path<Object> result = path.get(property.getSegment());
return property.hasNext() ? toExpressionRecursively(result, property.next()) : result;
}