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.

  private Database getDatabase(Resource db)
  {
    if (res2db.containsKey(db))
      return res2db.get(db);
    
    Literal user = db.getProperty(DbMap.user).getLiteral();
    Literal pass = db.getProperty(DbMap.pass).getLiteral();
    Literal driver = db.getProperty(DbMap.driver).getLiteral();
    Database database = new Database(db, user, pass, driver);
    res2db.put(db, database); // don't keep creating !!


    return database;
  }

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          Element e = (Element) nl.item(i);
          noSchemaToRDF(obj,e,s,ctx);
          break;
        case Node.TEXT_NODE:
          String value = ((Text) nl.item(i)).getNodeValue().trim();
          Literal lit = null;
          if (elem.hasAttributeNS(XML,"lang"))
            lit = m.createLiteral(value, elem.getAttributeNS(XML,"lang"));
          else 
            lit = ctx.getModel().createLiteral(value);
          
          stmt = ctx.getModel().createStatement(obj,RDF.value,lit);
          if (!value.equals("")) {
            ctx.getModel().add(stmt);
            if (s!=null) s.add(stmt.createReifiedStatement());
          }
        }
      }
      return true;
    }
    else { // looks like a simple type
      String value = XMLBean.getValue(elem);
      if (value!=null && ctx.isPreserved()) value = value.trim();
      if (value==null) value = "";
      
      Literal l =  m.createLiteral(value);
      stmt = m.createStatement(subject,prop,l);      
      m.add(stmt);
      if (seq != null && stmt!=null) seq.add(stmt.createReifiedStatement());      
      return true;
    }

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        if (!ns.equals(XMLBean.XML) && !ns.equals(schema.XSI)) 
          XMLBean.addPrefixes(prefix,ns,ctx.getModel());
      }
      return;          
    }
    Literal l = ctx.getModel().createLiteral(attr.getValue());
    String u = XMLBean.expandQName(attr, ctx);
    if (!u.startsWith(schema.XSI) && !u.startsWith(XMLBean.XML)) { 
      // not a schema instance or XML property
      Property p = ctx.getModel().createProperty(u);
      subject.addProperty(p,l);

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      for (Iterator ui = pending.iterator(); ui.hasNext(); ) {
        Statement stmt = (Statement) ui.next();
        if (stmt.getPredicate().equals(RDF.value)) {
          RDFNode n = stmt.getObject();
          if (n.isLiteral()) {
            Literal l = (Literal) n;
            elem.appendChild(doc.createTextNode(l.getString()));  
            if (l.getLanguage()!=null) elem.setAttributeNS(XML,"lang",l.getLanguage());
          }
        }
        else if (stmt.getPredicate().getNameSpace().equals(RDF.getURI())) ;
        else {
          Attr a = noSchemaToAttribute(doc,stmt.getPredicate(), ctx);

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        return true;
      }
    }
    else {
      // literal
      Literal l = (Literal) rdf;
      attr.setNodeValue(l.getString());
    }
    return false;
  }

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    if (!resource.hasProperty(p)) {
      return defaultValue;
    }
    assertHasOneValue(p);
    assertLiteralValue(p);
    Literal value = resource.getProperty(p).getLiteral();
    if (XSD.xboolean.getURI().equals(value.getDatatypeURI())) {
      return value.getBoolean();
    }
    if (value.getDatatypeURI() == null || XSD.xstring.getURI().equals(value.getDatatypeURI())) {
      if ("true".equals(value.getString().toLowerCase())
          || "false".equals(value.getString().toLowerCase())) {
        return "true".equals(value.getString().toLowerCase());
      }
    }
    raiseUnexpectedDatatype("xsd:boolean", resource.getProperty(p));
    return false;
  }

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    }
  }
  
  private void assertString(Statement stmt) {
    assertLiteralValue(stmt);
    Literal value = stmt.getLiteral();
    if (value.getDatatypeURI() == null || 
        XSD.xstring.getURI().equals(value.getDatatypeURI()) ||
        (RDF.getURI() + "langString").equals(value.getDatatypeURI())) {
      return;
    }
    raiseUnexpectedDatatype("string", stmt);
  }

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    return getLabel(iri, preferPlural, defaultLanguage);
  }


  public Literal getLabel(String iri, boolean preferPlural, String language) {
    if (preferPlural) {
      Literal pluralLabel = pluralLabels.get(iri, language);
      return pluralLabel == null ? getLabel(iri, false, language) : pluralLabel;
    }
    return labels.get(iri, language);
  }

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   * @param preferPlural Return <tt>conf:pluralLabel</tt> if available
   * @return The best label found, or null if none
   */
  public Literal getCachedLabel(String iri, boolean preferPlural) {
    if (preferPlural) {
      Literal pluralLabel = pluralLabels.getCached(iri, defaultLanguage);
      return pluralLabel == null ? getCachedLabel(iri, false) : pluralLabel;
    }
    return labels.getCached(iri, defaultLanguage);
  }

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    return getInverseLabel(iri, preferPlural, defaultLanguage);
  }
  
  public Literal getInverseLabel(String iri, boolean preferPlural, String language) {
    if (preferPlural) {
      Literal pluralLabel = inversePluralLabels.get(iri, language);
      return pluralLabel == null ? getInverseLabel(iri, false, language) : pluralLabel;
    }
    return inverseLabels.get(iri, language);
  }

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