Examples with ValueFactory org.eclipse.rdf4j.model.ValueFactory used on opensource projects

Example 1 with ValueFactory

use of org.eclipse.rdf4j.model.ValueFactory in project opentheso by miledrousset.

the class ReadRdfFileTest method test3.

public static void test3() {
    // To create a blank node for the address, we need a ValueFactory
    ValueFactory vf = SimpleValueFactory.getInstance();
    BNode address = vf.createBNode();
    // Identically to example 03, we create a model with some data
    ModelBuilder builder = new ModelBuilder();
    builder.setNamespace("ex", "http://example.org/").subject("ex:Picasso").add(RDF.TYPE, "ex:Artist").add(FOAF.FIRST_NAME, "Pablo").add("ex:homeAddress", // link the blank node
    address).subject(// switch the subject
    address).add("ex:street", "31 Art Gallery").add("ex:city", "Madrid").add("ex:country", "Spain");
    Model model = builder.build();
    // Instead of simply printing the statements to the screen, we use a Rio writer to
    // write the model in RDF/XML syntax:
    Rio.write(model, System.out, RDFFormat.RDFXML);
    File file = new File("test.rdf");
    FileWriter writer = null;
    try {
        file.createNewFile();
        writer = new FileWriter(file);
    } catch (IOException ex) {
        Logger.getLogger(ReadRdfFileTest.class.getName()).log(Level.SEVERE, null, ex);
    }
    Rio.write(model, writer, RDFFormat.RDFXML);
}

Example 2 with ValueFactory

use of org.eclipse.rdf4j.model.ValueFactory in project opentheso by miledrousset.

the class ReadRdfFileTest method test2.

public static void test2() {
    ValueFactory vf = SimpleValueFactory.getInstance();
    ModelBuilder builder = new ModelBuilder();
    Model model = builder.setNamespace("ex", "http://example.org/").subject("ex:PotatoEaters").add(DC.TITLE, vf.createLiteral("The Potato Eaters", "en")).add(DC.TITLE, vf.createLiteral("De Aardappeleters", "nl")).build();
    // To see what's in our model, let's just print it to the screen
    for (Statement st : model) {
        // we want to see the object values of each statement
        Value value = st.getObject();
        if (value instanceof Literal) {
            Literal title = (Literal) value;
            System.out.println("language: " + title.getLanguage().orElse("unknown"));
            System.out.println(" title: " + title.getLabel());
        }
    }
}

Example 3 with ValueFactory

use of org.eclipse.rdf4j.model.ValueFactory in project opentheso by miledrousset.

the class WriteRdfFileTest method write2.

@Test
public void write2() {
    ValueFactory vf = SimpleValueFactory.getInstance();
    // Create a new RDF model containing information about the painting "The Potato Eaters"
    ModelBuilder builder = new ModelBuilder();
    Model model = builder.setNamespace("ex", "http://example.org/").subject("ex:PotatoEaters").add("ex:creationDate", vf.createLiteral("1885-04-01T00:00:00Z", XMLSchema.DATETIME)).add("ex:peopleDepicted", 5).build();
    // To see what's in our model, let's just print stuff to the screen
    for (Statement st : model) {
        // we want to see the object values of each property
        IRI property = st.getPredicate();
        Value value = st.getObject();
        if (value instanceof Literal) {
            Literal literal = (Literal) value;
            System.out.println("datatype: " + literal.getDatatype());
            // get the value of the literal directly as a Java primitive.
            if (property.getLocalName().equals("peopleDepicted")) {
                int peopleDepicted = literal.intValue();
                System.out.println(peopleDepicted + " people are depicted in this painting");
            } else if (property.getLocalName().equals("creationDate")) {
                XMLGregorianCalendar calendar = literal.calendarValue();
                Date date = calendar.toGregorianCalendar().getTime();
                System.out.println("The painting was created on " + date);
            }
            // you can also just get the lexical value (a string) without worrying about the datatype
            System.out.println("Lexical value: '" + literal.getLabel() + "'");
        }
    }
    Rio.write(model, System.out, RDFFormat.RDFXML);
}

Example 4 with ValueFactory

use of org.eclipse.rdf4j.model.ValueFactory in project opentheso by miledrousset.

the class WriteRdfFileTest method write3.

@Test
public void write3() {
    ValueFactory vf = SimpleValueFactory.getInstance();
    BNode address = vf.createBNode();
    // First we do the same thing we did in example 02: create a new ModelBuilder, and add
    // two statements about Picasso.
    ModelBuilder builder = new ModelBuilder();
    builder.setNamespace("ex", "http://example.org/").subject("ex:Picasso").add(RDF.TYPE, "ex:Artist").add(FOAF.FIRST_NAME, "Pablo").add("ex:homeAddress", // link the blank node
    address).subject(// switch the subject
    address).add("ex:street", "31 Art Gallery").add("ex:city", "Madrid").add("ex:country", "Spain");
    Model model = builder.build();
    // To see what's in our model, let's just print it to the screen
    for (Statement st : model) {
        System.out.println(st);
    }
    Rio.write(model, System.out, RDFFormat.RDFXML);
}

Example 5 with ValueFactory

use of org.eclipse.rdf4j.model.ValueFactory in project opentheso by miledrousset.

the class json_ld_first_test method start_test.

@Test
public void start_test() throws FileNotFoundException, IOException, JsonLdError {
    System.out.println("");
    System.out.println("");
    System.out.println("*******************************************************");
    System.out.println("*                     JSON LD                         *");
    System.out.println("*******************************************************");
    InputStream inputStream = new FileInputStream("input_test.json");
    // Read the file into an Object (The type of this object will be a List, Map, String, Boolean,
    // Number or null depending on the root object in the file).
    Object jsonObject = JsonUtils.fromInputStream(inputStream);
    // Create a context JSON map containing prefixes and definitions
    Map context = new HashMap();
    // Customise context...
    // Create an instance of JsonLdOptions with the standard JSON-LD options
    JsonLdOptions options = new JsonLdOptions();
    // Customise options...
    // Call whichever JSONLD function you want! (e.g. compact)
    Object compact = JsonLdProcessor.compact(jsonObject, context, options);
    // Print out the result (or don't, it's your call!)
    System.out.println(JsonUtils.toPrettyString(compact));
    System.out.println("*******************************************************");
    System.out.println("*                     org.JSON                        *");
    System.out.println("*******************************************************");
    inputStream = new FileInputStream("input_test.json");
    JSONObject obj = new JSONObject(IOUtils.toString(inputStream));
    System.out.println(obj.getString("name"));
    obj.put("test", "writeIsWorking");
    System.out.println(obj.getString("test"));
    System.out.println("");
    System.out.println(obj.toString());
    System.out.println("");
    System.out.println("*******************************************************");
    System.out.println("*                     RDJF WRITE                      *");
    System.out.println("*******************************************************");
    ValueFactory vf = SimpleValueFactory.getInstance();
    // Create a new RDF model containing information about the painting "The Potato Eaters"
    ModelBuilder builder = new ModelBuilder();
    Model model = builder.setNamespace("ex", "http://example.org/").subject("ex:PotatoEaters").add("ex:creationDate", vf.createLiteral("1885-04-01T00:00:00Z", XMLSchema.DATETIME)).add("ex:peopleDepicted", 5).build();
    Rio.write(model, System.out, RDFFormat.JSONLD);
    System.out.println("");
    System.out.println("");
    System.out.println("*******************************************************");
    System.out.println("*                     RDJF READ                       *");
    System.out.println("*******************************************************");
    inputStream = new FileInputStream("input_test.json");
    model = Rio.parse(inputStream, "", RDFFormat.JSONLD);
    Rio.write(model, System.out, RDFFormat.JSONLD);
    System.out.println("");
    for (Statement st : model) {
        // we want to see the object values of each statement
        Value value = st.getObject();
        IRI property = st.getPredicate();
        if (property.getLocalName().equals("name")) {
            Literal title = (Literal) value;
            System.out.println("name: " + title.getLabel());
        }
    }
    System.out.println("");
    System.out.println("");
    System.out.println("");
    System.out.println("");
}