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.

                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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                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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        Resource r1 = ResourceFactory.createResource("http://example/r1") ;
        Resource r2 = ResourceFactory.createResource("http://example/r2") ;
        Resource r3 = ResourceFactory.createResource("http://example/r3") ;
        Resource r4 = ResourceFactory.createResource("http://example/r4") ;
        Literal  lit1 = ResourceFactory.createPlainLiteral("doc") ;
        
        // ---- Index based on some external content.  Teh content can be any string of words. 
        
        larqBuilder.index(r1, new StringReader("document")) ;   // Just to show a Stringreader is possible
        larqBuilder.index(r2, "document") ;

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      NamedNode component = new NamedNodeImpl(assertedComponent.getURI());
      componentTypeMap.put(component, type);
      SourceComponent sourceComponent = new SourceComponent(source, component);
      {
        //adding assertion
        Literal assertionTimeLit = assertion.getProperty(
            METAMODEL.assertionTime).getLiteral();
        Date assertionTime = ((XSDDateTime) assertionTimeLit.getValue())
        .asCalendar().getTime();
        RelevantMoment relevantMoment = getRelevantMoment(assertionTime);
        relevantMoment.assertions.add(sourceComponent);
        putToValueSet(whatWhenMap, sourceComponent, relevantMoment);
        putToValueSet(whoWhat, source, relevantMoment);
      }
      if (assertion.hasProperty(METAMODEL.revocationTime)) {
        Literal revocationTimeLit = assertion.getProperty(
            METAMODEL.revocationTime).getLiteral();
        Date revocationTime = ((XSDDateTime) revocationTimeLit.getValue())
        .asCalendar().getTime();
        RelevantMoment relevantMoment = getRelevantMoment(revocationTime);
        relevantMoment.revocations.add(sourceComponent);
        putToValueSet(whatWhenMap, sourceComponent, relevantMoment);
        putToValueSet(whoWhat, source, relevantMoment);

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    Resource assertion = metaModel.createResource();
    assertion.addProperty(METAMODEL.asserter, metaModel
        .createResource(source.getURIRef()));
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(moment);
    Literal momentLit = metaModel.createTypedLiteral(new XSDDateTime(
        calendar));
    /*
     * Literal momentLit = metaModel.createTypedLiteral( new
     * MillisDateFormat().format(moment), XSDDatatype.XSDdateTime);
     */

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      Resource sourceRes = metaModel.createResource(source.getURIRef());
      ResIterator assertions = metaModel.listSubjectsWithProperty(
          METAMODEL.asserter, sourceRes);
      while (assertions.hasNext()) {
        Resource assertion = assertions.nextResource();
        Literal assertionTimeLit = assertion.getProperty(
            METAMODEL.assertionTime).getLiteral();
        Resource assertedComponent = assertion.getProperty(
            METAMODEL.assertedComponent).getResource();
        if (!assertedComponent.hasProperty(RDF.type, type)) {
          continue;
        }


        Date assertionTime;
        assertionTime = ((XSDDateTime) assertionTimeLit.getValue())
            .asCalendar().getTime();
        /*
         * try { assertionTime = new MillisDateFormat()
         * .parse(assertionTimeLit.getLexicalForm()); } catch
         * (ParseException e) { throw new RuntimeException(e); }
         */
        if (moment.before(assertionTime)) {
          continue;
        }
        Statement revocationTimeStmt = assertion
            .getProperty(METAMODEL.revocationTime);
        if (revocationTimeStmt != null) {
          Literal revocationTimeLit = revocationTimeStmt.getLiteral();
          Date revocationTime = ((XSDDateTime) revocationTimeLit
              .getValue()).asCalendar().getTime();
          // not before rather than after as in the moment of
          // revocation it is revoked
          if (!moment.before(revocationTime)) {
            continue;

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    if (revokingComponentRes == null) {
      throw new StoreException("Assertion not found");
    }
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(moment);
    Literal momentLit = metaModel.createTypedLiteral(new XSDDateTime(
        calendar));
    /*
     * Literal momentLit = metaModel.createTypedLiteral( new
     * MillisDateFormat().format(moment), XSDDatatype.XSDdateTime);
     */

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    while (assertionsOfComponent.hasNext()) {
      Resource assertion = assertionsOfComponent.nextResource();
      if (!assertion.hasProperty(METAMODEL.asserter, sourceRes)) {
        continue;
      }
      Literal assertionTimeLit = assertion.getProperty(
          METAMODEL.assertionTime).getLiteral();
      Date assertionTime;
      assertionTime = ((XSDDateTime) assertionTimeLit.getValue())
          .asCalendar().getTime();


      if (moment.before(assertionTime)) {
        continue;
      }
      Statement revocationTimeStmt = assertion
          .getProperty(METAMODEL.revocationTime);
      if (revocationTimeStmt != null) {
        Literal revocationTimeLit = revocationTimeStmt.getLiteral();
        Date revocationTime = ((XSDDateTime) revocationTimeLit
            .getValue()).asCalendar().getTime();


        // not before rather than after as in the moment of
        // revocation it is revoked
        if (!moment.before(revocationTime)) {

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      Resource sourceRes = metaModel.createResource(source.getURIRef());
      ResIterator assertions = metaModel.listSubjectsWithProperty(
          METAMODEL.asserter, sourceRes);
      while (assertions.hasNext()) {
        Resource assertion = assertions.nextResource();
        Literal assertionTimeLit = assertion.getProperty(
            METAMODEL.assertionTime).getLiteral();
        Date assertionTime;
        try {
          assertionTime = ((XSDDateTime) assertionTimeLit.getValue())
              .asCalendar().getTime();
          /*
           * assertionTime = new MillisDateFormat()
           * .parse(assertionTimeLit.getLexicalForm());
           */
        } catch (/* Parse */Exception e) {
          throw new RuntimeException(e);
        }
        if (forward) {
          if (assertionTime.after(moment)) {
            resultDateSet.add(assertionTime);
          }
        } else {
          if (!assertionTime.after(moment)) {
            resultDateSet.add(assertionTime);
          }
        }
        Statement revocationTimeStmt = assertion
            .getProperty(METAMODEL.revocationTime);
        if (revocationTimeStmt != null) {
          Literal revocationTimeLit = revocationTimeStmt.getLiteral();
          Date revocationTime;
          revocationTime = ((XSDDateTime) revocationTimeLit
              .getValue()).asCalendar().getTime();
          /*
           * try { revocationTime = new MillisDateFormat()
           * .parse(revocationTimeLit.getLexicalForm()); } catch
           * (ParseException e) { throw new RuntimeException(e); }

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