I have an HDT file. How can I initialise in Java a qEndpoint on top of it?

[D063520]

The title is the question ; )

[ate47]

Hello,

You need to put the HDT in a directory, here /path/to/the/hdt/dir, then determine a directory for the delta store, here /path/to/delta/dir, then run this:

// create a SPARQL repository
SparqlRepository repository = CompiledSail.compiler()
         // describe the files used to create/load the store:
         // /path/to/the/hdt/dir : location of the directory containing the HDT
         // /path/to/delta/dir   : location of the directory containing the delta store 
         //                        (if none, a new one will be created)
         // filename.hdt         : name of the HDT file
        .withEndpointFiles(new EndpointFiles(
                Path.of("/path/to/the/hdt/dir"),
                Path.of("/path/to/delta/dir"),
                "filename.hdt"
        ))
        // describe the spec used to load the HDT, can be ommited if none are required
        .withHDTSpec("hdt_spec_config")
         // create the repo
        .compileToSparqlRepository();

try {
    // run a simple SPO query as an example
    Variable s = SparqlBuilder.var("s");
    Variable p = SparqlBuilder.var("p");
    Variable o = SparqlBuilder.var("o");
    try (ClosableResult<TupleQueryResult> result =
                    repository.executeTupleQuery(
                            Queries.SELECT()
                                    .select(s, p, o)
                                    .where(s.has(p, o))
                                    .getQueryString(),
                            10)
    ) {
        result.getResult().forEach(b -> {
            // print the (s,p,o) binding
            System.out.println(
                    b.getBinding(s.getVarName()) + " "
                            + b.getBinding(p.getVarName()) + " "
                            + b.getBinding(o.getVarName())
            );
        });
    }
} finally {
    // shutdown the store, it is important to release the resources!!
    repository.shutDown();
}

one day it will probably be easier....

[D063520]

merci, and I agree one can make this simpler ; )