RDF2Go/Binding

RDF2Go has several ways to configure, which triple store driver (aka adapter) to use.

Register a ModelFactory

RDF2Go.getModelFactory() does two things:

• First, it looks if anybody had explicitly registered a ModelFactory to be used via RDF2Go.

// register adapter of implementation XYZ, could be Jena or Sesame or anything.
RDF2Go.register( new org.ontoware.rdf2go.impl.XYZ.ModelFactoryImpl() );

// start using RDF2Go
Model m = RDF2Go.getModelFactory().createModel();

See also API docs of RDF2Go.class.

Static Binding

As a fallback, if no RDF2Go.register(..) was ever called, RDF2Go looks for a static binding, that is, it loads the class org.ontoware.rdf2go.impl.StaticBinding - wherever that is found on the classpath. The Sesame adapters e.g. contain such a class.

THis idea is dea stolen from slf4j, look in their [http://www.slf4j.org/faq.html FAQ). This is the most elegant way, with no triple store specific code at all.

Any explicitly registered ModelFactory will be used before RDF2Go looks in the classpath.

OSGi

Third, one can use OSGI to do that.

Use a ModelFactory directly

Fourth, one can completely ignore the RDF2Go.class and direclty use a certain ModelFactory, e.g.

MyStoreFactory.createModel().

Create Model directly, wrap later

Fifth, one can ignore the idea of Factories alltogether, and configure a certain

x = MyStoreSpecificModel( .. );

by hand and only wrap it later, by calling

new MyStoreRDF2GoModel( x );

An example for Sesame

// create native store
NativeStore ns = new NativeStore(storageDir);
// add many indexec = vendor-specific configuration
ns.setParameter("triple-indexes", "spoc, posc, sopc, psoc, ospc, opsc");
Repository myRepository = new SailRepository(ns);
myRepository.initialize();

// wrap Sesame in an RDF2Go adapter
ModelSet rdf2goModelSet = new RepositoryModelSet(myRepository);

// open
rdf2goModelSet.open();