CODEWITHSUNDEEP
rdfjenaontology
user2057437
user2057437

Reputation: 81

How to create method public static boolean setType(Resource resource, String typeName) in jena rdf

Can you please help me in building the code in setting a Resource to a Class

import com.hp.hpl.jena.ontology.Individual;
import com.hp.hpl.jena.ontology.OntModel;
import com.hp.hpl.jena.query.Dataset;
import com.hp.hpl.jena.query.ReadWrite;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.rdf.model.Resource;
import com.hp.hpl.jena.tdb.TDBFactory;

public class ModelMain {

    String dbName = "DataBase";
    String ns1 =  "http://text.book/Someone#";
    String ns;
    Dataset ds;
    OntModel m;

// created a model and stored in database public StoryModel(String Name){

        ns = ns1 + Name;
        ds = TDBFactory.createDataset(dbName);
        m = ModelFactory.createOntologyModel();

    }

// Assigning resource to class
public void initModel() {

        m.createClass(ns + "Thing");
        m.createClass(ns + "Object");
        saveModel();

    }

//read and write model public void saveModel() {

        ds.begin(ReadWrite.WRITE);
        m.write(System.out, "RDF/XML-ABBREV");

    }

// creating a resource
public Resource createResource(String resourceName, String clsName) {

        String resourceuri = ns + resourceName;
        String classuri = ns + className;

        Resource classr = m.getResource(classuri);
        Individual i = m.createIndividual(resourceuri, classr);

        return i;

    }

// Assigning type to resource
public static boolean setType(Resource resource, String typeName) { //how to assign type to a resource } }

Upvotes: 0

Views: 140

Answers (2)

Rob Hall
Rob Hall

Reputation: 2823

If you have an OntResource (which Individual is), then you may potentially consider use of the setPropertyValue(Property, RDFNode) method to set a type. Note that this differs only from @AndyS's answer in that it removes any other RDF.type properties that already exist in the graph before adding the new triple.

Starting with the model:

:a rdf:type :Cat .
:a rdf:type :DomesticAnimal .

The following code (assuming a is an Individual):

a.setPropertyValue(RDF.type, TheTypeAsResource);

Will result in the model:

a: rdf:type :theType .

This, naturally, will only serve your purpose if you do not intend to add an additional type to the resource, and instead, intend to set a specific type for that resource to have.

Upvotes: 1

AndyS
AndyS

Reputation: 16630

You need to add a statement to the data:

model.add(resource, RDF.type, TheTypeAsAResource) ;

Upvotes: 1

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