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.

    Literal getCached(String iri, String preferredLang) {
      return getBestMatch(getCached(iri), preferredLang);
    }
    private Literal getBestMatch(Collection<Literal> candidates, String preferredLang) {
      if (candidates == null) return null;
      Literal bestMatch = null;
      int bestMatchLength = -1;
      for (Literal l: candidates) {
        int matchLength = getMatchLength(l.getLanguage(), preferredLang);
        if (matchLength >= bestMatchLength) {
          bestMatch = l;

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    @Override
    Collection<Literal> pickBestValue(Set<RDFNode> candidates) {
      Collection<Literal> result = new ArrayList<Literal>(candidates.size());
      for (RDFNode node: candidates) {
        if (!node.isLiteral()) continue;
        Literal l = node.asLiteral();
        String dt = l.getDatatypeURI();
        if (dt == null || dt.equals(XSD.xstring.getURI()) || dt.equals(RDF.getURI() + "langString")) {
          result.add(l);
        }
      }
      return result;

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   * generate an attempt at a human-readable title from the URI. If the
   * resource is blank, return null.
   */
  public String getTitle() {
    if (!resource.isResource()) return null;
    Literal l = getLabel();
    String label = l == null ? null : l.getLexicalForm();
    String lang = l == null ? null : l.getLanguage();
    if (label == null) {
      label = new URIPrefixer(resource, getPrefixes()).getLocalName();
    }
    if ("".equals(label)) { // Prefix mapping assigns an empty local name
      label = resource.getURI();

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    return getBestLanguageMatch(candidates, config.getDefaultLanguage());
  }
  
  public String getComment() {
    Collection<RDFNode> candidates = getValuesFromMultipleProperties(config.getCommentProperties());
    Literal l = getBestLanguageMatch(candidates, config.getDefaultLanguage());
    if (l == null) return null;
    return toSentenceCase(l.getLexicalForm(), l.getLanguage());
  }

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   * The logic is that those literals are probably an error on the data
   * producer side and are best not shown to the user in HTML views.
   */
  private boolean isEmptyLiteral(RDFNode node) {
    if (!node.isLiteral()) return false;
    Literal l = node.asLiteral();
    if (l.getDatatypeURI() == null ||
        l.getDatatypeURI().startsWith(RDF.getURI()) ||
        l.getDatatypeURI().startsWith(XSD.getURI())) {
      if ("".equals(l.getLexicalForm())) return true;
    }
    return false;
  }

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  }
  
  // TODO: There is some better (?) code doing the same in VocabularyStore.I18nStringValueCache
  private Literal getBestLanguageMatch(Collection<RDFNode> nodes, String lang) {
    Iterator<RDFNode> it = nodes.iterator();
    Literal aLiteral = null;
    while (it.hasNext()) {
      RDFNode candidate = it.next();
      if (!candidate.isLiteral()) continue;
      Literal literal = candidate.asLiteral();
      if (lang == null
          || lang.equals(literal.getLanguage())) {
        return literal;
      }
      aLiteral = literal;
    }
    return aLiteral;

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    }
    public String getLabel() {
      return getLabel(isMultiValued());
    }
    public String getLabel(boolean preferPlural) {
      Literal label = vocabularyStore.getLabel(predicate.getURI(), preferPlural);
      if (label == null) return null;
      return toTitleCase(label.getLexicalForm(), label.getLanguage());
    }

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    }
    public String getInverseLabel() {
      return getInverseLabel(isMultiValued());
    }
    public String getInverseLabel(boolean preferPlural) {
      Literal label = vocabularyStore.getInverseLabel(predicate.getURI(), preferPlural);
      if (label == null) return null;
      return toTitleCase(label.getLexicalForm(), label.getLanguage());
    }

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      }
      return prefixer.getLocalName();
    }
    public String getLabel() {
      if (!node.isResource()) return null;
      Literal result = null;
      if (node.isURIResource()) {
        if (predicate.equals(RDF.type)) {
          // Look up class labels in vocabulary store
          result = vocabularyStore.getLabel(node.asNode().getURI(), false);
        } else if (node.isURIResource()) {
          // If it's not a class, see if we happen to have a label cached
          result = vocabularyStore.getCachedLabel(node.asResource().getURI(), false);
        }
      }
      if (result == null) {
        // Use any label that may be included in the description model
        result = new ResourceDescription(node.asResource(), model, config).getLabel();
      }
      if (result == null) return null;
      return toTitleCase(result.getLexicalForm(), result.getLanguage());
    }

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    }
    
    String creationDate = node.toString();
    String version = _getVersionFromCreationDate(creationDate);
    if ( version != null ) {
      Literal versionLit = ResourceFactory.createPlainLiteral(version);
      ontology.setPropertyValue(Omv.version, versionLit);
      return version;
    }
    return null;
  }

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