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Can I allow access to ONLY the default graph in Apache Jena?

I know I can select default and/or named graphs for queries, but my question is:

Can I hide any named graphs in Apache Jena from being listed or queried via SPARQL, only allowing access to the default graph (a setting/configuration)?

Thanks!

Solution

  • This can be done by making a dataset out of the default model.

    API:

    Dataset dataset = ...;
Dataset datasetDefaultOnly = DatasetFactory.wrap(dataset.getDefaultModel);

    For a Fuseki configuration, the same approach:

    # Dataset with only the default graph.
:dataset rdf:type       ja:RDFDataset ;
    ja:defaultGraph     :oneGraph
     .

# Graph from a TDB2 dataset
:oneGraph rdf:type tdb2:GraphTDB2 ;
    tdb2:dataset :tdbDataset .

## Data in TDB.
:tdbDataset rdf:type tdb2:DatasetTDB2 ;
    tdb2:location "DB" ;
    .

    Another approach is to check SPARQL queries to make sure they have no FROM, FROM NAMED or GRAPH in them.