Examples of com.hp.hpl.jena.rdf.model.Literal

com.hp.hpl.jena.rdf.model.Literal
An RDF Literal.
In RDF2003 literals can be typed. If typed then the literal comprises a datatype, a lexical form and a value (together with an optional xml:lang string). Old style literals have no type and are termed "plain" literals.

Implementations of this interface should be able to support both plain and typed literals. In the case of typed literals the primitive accessor methods such as getInt() determine if the literal value can be coerced to an appropriate java wrapper class. If so then the class is unwrapped to extract the primitive value returned. If the coercion fails then a runtime DatatypeFormatException is thrown.

In the case of plain literals then the primitve accessor methods duplicate the behvaiour of jena1. The literal is internally stored in lexical form but the accessor methods such as getInt will attempt to parse the lexical form and if successful will return the primitive value.

Object (i.e. non-primitive) values are supported. In the case of typed literals then a global TypeMapper registry determines what datatype representation to use for a given Object type. In the case of plain literals then the object will be stored in the lexical form given by its toString method. Factory objects, provided by the application, are needed in that case to covert the lexical form back into the appropriate object type.

        
        Property p = this.jenaModel.createProperty(predicate.toString());
        
        String datatypeValue = ((DatatypeLiteral)object).getValue();
        String datatypeURI = ((DatatypeLiteral)object).getDatatype().toString();
        Literal o = this.jenaModel.createTypedLiteral(datatypeValue, datatypeURI);
        
        // Add the statement to the model
        this.jenaModel.add(s, p, o);
      }
    } catch(BadURIException e) {

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    // f�r den dritten BaseDatatype nehmen wir eine neue Datentyp URI
    RDFDatatype DTtestB = TypeMapper.getInstance().getTypeByName(strTestB);
    
    com.hp.hpl.jena.rdf.model.Model model = ModelFactory.createDefaultModel();
    
    Literal litA11 = model.createTypedLiteral("teststring", DTtestA1);
    Literal litA12 = model.createTypedLiteral("teststring", DTtestA1);
    Literal litA2 = model.createTypedLiteral("teststring", DTtestA2);
    @SuppressWarnings("unused")
    Literal litB = model.createTypedLiteral("teststring", DTtestB);
    
    // alle Literals haben den gleichen Wert !
    
    // dann wollen wir mal schauen was passiert:

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    // typed literals
    // semantisch so behandelt wie wir es wollen
    // Behold !!
    JenaParameters.enableSilentAcceptanceOfUnknownDatatypes = true;
    
    Literal litA1 = model.createTypedLiteral("teststring", strTestA);
    Literal litA2 = model.createTypedLiteral("teststring", strTestA);
    Literal litB = model.createTypedLiteral("teststring", strTestB);
    
    // dann wollen wir mal schauen was passiert:
    
    // reflexivit�t: A == A , passt
    assertTrue(litA1.equals(litA1));
    // gleicher Inhalt, in zwei versch. Objekten, passt auch
    assertTrue(litA1.equals(litA2));
    // und zur sicherheit: 2 versch Datentyp URIs: nein
    assertFalse(litA1.equals(litB));
    
    // und nochmal der negativ Test:
    assertTrue(litB.equals(litB));
    assertFalse(litB.equals(litA1));
    assertFalse(litB.equals(litA2));
    assertEquals("Extract Datatype URI", litA1.getDatatypeURI(), strTestA);
    assertEquals("Extract value", "teststring", litA1.getLexicalForm());
    
    // im jena cvs geht auch folgendes, damit kann man das Object des Daten
    // Typs besser manipulieren

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      log.debug("instanceof DatatypeLiteral");
      
      boolean originalFlag = JenaParameters.enableSilentAcceptanceOfUnknownDatatypes;
      JenaParameters.enableSilentAcceptanceOfUnknownDatatypes = true;
      
      Literal l = model.createTypedLiteral(((DatatypeLiteral)o).getValue(),
              ((DatatypeLiteral)o).getDatatype().toString());
      
      JenaParameters.enableSilentAcceptanceOfUnknownDatatypes = originalFlag;
      
      return l.asNode();
      
    }
    
    if(o instanceof LanguageTagLiteral) {
      // langtag

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                RDFNode x = rb.get("title") ;
                
                // Check the type of the result value
                if ( x.isLiteral() )
                {
                    Literal titleStr = (Literal)x  ;
                    System.out.println("    "+titleStr) ;
                }
                else
                    System.out.println("Strange - not a literal: "+x) ;

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    @Test
    public void typedLiterals() {
        MGraph mGraph = new SimpleMGraph();
        com.hp.hpl.jena.graph.Graph graph = new JenaGraph(mGraph);
        Model model = ModelFactory.createModelForGraph(graph);
        Literal typedLiteral = model.createTypedLiteral("<elem>foo</elem>", XMLLiteralType.theXMLLiteralType);
        model.add(RDFS.Class, RDFS.label, typedLiteral);
        Assert.assertEquals(1, mGraph.size());
        StmtIterator iter = model.listStatements(RDFS.Class, RDFS.label, (Resource)null);
        Assert.assertTrue(iter.hasNext());
        RDFNode gotObject = iter.nextStatement().getObject();

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                RDFNode x = rb.get("title") ;
                
                // Check the type of the result value
                if ( x instanceof Literal )
                {
                    Literal titleStr = (Literal)x  ;
                    System.out.println("    "+titleStr) ;
                }
                else
                    System.out.println("Strange - not a literal: "+x) ;

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                RDFNode x = rb.get("title") ;
                
                // Check the type of the result value
                if ( x instanceof Literal )
                {
                    Literal titleStr = (Literal)x  ;
                    System.out.println("    "+titleStr) ;
                }
                else
                    System.out.println("Strange - not a literal: "+x) ;

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                RDFNode x = rb.get("title") ;
                
                // Check the type of the result value
                if ( x.isLiteral() )
                {
                    Literal titleStr = (Literal)x  ;
                    System.out.println("    "+titleStr) ;
                }
                else
                    System.out.println("Strange - not a literal: "+x) ;

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    {
        Model m  = root.getModel() ;
        // Assume one result set per file.
        for ( int index = 1 ; ; index++ )
        {
            Literal ind = m.createTypedLiteral(index) ;
            StmtIterator sIter = m.listStatements(null, ResultSetGraphVocab.index, ind) ;
            if ( ! sIter.hasNext() )
                break ;
            Statement s = sIter.nextStatement() ;
            if ( sIter.hasNext() )

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