Thanks Andy. I want to resolve imports and run inferences and then wrap it to make it immutable so it can be passed around but not modified. The getOntology() method is being used so OntModel is preferred to plain Model.
On Mon, 20 Dec 2021 at 13.55, Andy Seaborne <a...@apache.org> wrote: > > > On 18/12/2021 22:00, Martynas Jusevičius wrote: > > Andy, > > > > A follow-up question: how would you create an immutable OntModel? > > > > OntModel ontModel = ModelFactory.createOntologyModel(ontModelSpec, > modelRO); > > > > Would the ontModel still be mutable? > > Don't know. > > And what do you want with regards to imports? > Won't it depend on the OntModelSpec and any inference? > > You could always have a read-only wrapper implementation of interface > OntModel. > > Andy > > > > > On Sat, Aug 28, 2021 at 3:43 PM Andy Seaborne <a...@apache.org> wrote: > >> > >> > >> > >> On 27/08/2021 12:23, Zak Mc Kracken wrote: > >>> Hi all, > >>> > >>> I have a little RDF file (describing a dataset metadata), which I want > >>> to read in an helper class and return as a read-only view on the file. > >>> The reason to return it as read-only is that I also keep a simple cache > >>> of uri/Object, which is a simplified view of RDF resources in the file, > >>> so a modifiable Model would make it impossible to keep the two aligned. > >>> > >>> That said, I wonder if there is some read-only wrapper for the Jena's > >>> Model interface, something similar to Collections.unmodifiableXXX(), > >>> which of course, would be based on the decorator pattern, with > >>> delegation to a base Model for most of the interface methods, except > >>> interceptors for addXXX(), which would throw > >>> UnsupportedOperationException. Would be easy to implement it, but I > >>> don't like to reinvent wheels, if something like that already exists. > >> > >> Apparently there isn't one. Not sure why not. > >> > >> There is a read-only graph (and a read-only DatasetGraph) so one way to > >> create a read-only model is: > >> > >> Model model = ModelFactory.createDefaultModel(); > >> Graph graphRO = new GraphReadOnly(model.getGraph()); > >> Model modelRO = ModelFactory.createModelForGraph(graphRO); > >> > >> Graph is a narrower interface do catching things here is less code. In > >> fact, GraphBase is read-only unless add/delete(Triple) are overwritten. > >> > >> Andy > >>> > >>> Thanks, > >>> Marco. > >>> > >>> >
