On 24/12/2020 17:18, Steve Vestal wrote:
What I did as part of exploring things was
Model baseModel =
ModelFactory.createModelForGraph(myDummyGraph);
OntModel wrapperModel =
ModelFactory.createOntologyModel(leafModelSpec, baseModel);
where myDummyGraph was a Graph implementation I could observe to see
what calls were made, and leafModelSpec is as specified previously. A
call was made to find all owl:Imports (a triple of the form <*>
<owl:Imports> <*>) during execution of the call to createOntologyModel.
Not what I get: I don't get any calls to the graph:
public static void main(String... a) throws Exception {
var leafDocMgr = new OntDocumentManager();
leafDocMgr.setFileManager();
leafDocMgr.setProcessImports(false);
leafDocMgr.setCacheModels(false);
var leafModelSpec = new OntModelSpec(OntModelSpec.OWL_MEM);
leafModelSpec.setDocumentManager(leafDocMgr);
//OntModel leafOntModel =
// ModelFactory.createOntologyModel(leafModelSpec);
Graph graph = GraphFactory.createDefaultGraph();
graph = new GraphWrapper(graph) {
@Override
public ExtendedIterator<Triple> find(Triple triple) {
System.out.println("findT(" + triple + ")");
return super.find(triple);
}
@Override
public ExtendedIterator<Triple> find(Node s, Node p, Node o) {
System.out.println("findN(" + s + ", " + p + ", " + o + ")");
return super.find(s, p, o);
}
@Override
public boolean contains(Node s, Node p, Node o) {
System.out.println("containsN(" + s + ", " + p + ", " + o +
")");
return super.contains(s, p, o);
}
@Override
public boolean contains(Triple t) {
System.out.println("containsT(" + t + ")");
return super.contains(t);
}
};
Model baseModel = ModelFactory.createModelForGraph(graph);
OntModel wrapperModel =
ModelFactory.createOntologyModel(leafModelSpec, baseModel);
System.out.println("DONE");
}
On 12/24/2020 10:59 AM, Andy Seaborne wrote:
On 24/12/2020 13:49, Steve Vestal wrote:
I am doing my own import closure, and I saw some behaviors that I
was a bit curious about. For my own education, I'd appreciate any
observations you might have.
I call setProcessImports(false) when creating the document manager,
but 1) my OntModel gets created as a UnionModel,
There is a comment in the code:
/** The union graph that contains the imports closure - there is
always one of these, which may also be _the_ graph for the model */
protected MultiUnion m_union = new MultiUnion();
There is always a union, even if union of one.
Because imports may change as add/deletes happen 9including
setSubModel), always being a union is probably a lot easier than
having a special case.
The code is OntModelImpl.generateGraph
and 2) a query is made to OntModel#getGraph() to find all owl:Imports.
when does this happen? It does not seem to happen with the setup
code you gave.
I thought these would be unnecessary with
setProcessImports(false). Is there any non-negligible overhead, or
processing I am not anticipating, going on?
Andy
Are there additional properties I should be setting? Is it the
case that setProcessImports(false) has no effect on how the overall
structure is assembled, but it does stop the actual creation of new
sub-models and the loading of those imported documents?
As background, I am constructing the sort of tree shown in section
/Compound Ontology Documents and Imports Processing/ on page
https://jena.apache.org/documentation/ontology/. I do some custom
ontology management, and my code processes all imports, OWL and
otherwise. Some of the leaf (non-base) models are OntModels. I am
loading those leaf OntModels as
leafDocMgr = new OntDocumentManager();
leafDocMgr.setFileManager();
leafDocMgr.setProcessImports(false);
leafDocMgr.setCacheModels(false);
leafModelSpec = new OntModelSpec(OntModelSpec.OWL_MEM);
leafModelSpec.setDocumentManager(leafDocMgr);
OntModel leafOntModel =
ModelFactory.createOntologyModel(leafModelSpec);
