Examples of org.coode.owl.rdfxml.parser.OWLRDFConsumer

org.coode.owl.rdfxml.parser.OWLRDFConsumer

Author: Matthew Horridge
The University Of Manchester
Bio-Health Informatics Group
Date: 07-Dec-2006

A parser/interpreter for an RDF graph which represents an OWL ontology. The consumer interprets triple patterns in the graph to produce the appropriate OWLAPI entities, descriptions and axioms.

The parser is based on triple handlers. A given triple handler handles a specific type of triple. Generally speaking this is based on the predicate of a triple, for example, A rdfs:subClassOf B is handled by a subClassOf handler. A handler determines if it can handle a triple in a streaming mode (i.e. while parsing is taking place) or if it can handle a triple after parsing has taken place and the complete graph is in memory. Once a handler handles a triple, that triple is deemed to have been consumed an is discarded.

The parser attempts to consume as many triples as possible while streaming parsing is taking place. Whether or not a triple can be consumed during parsing is determined by installed triple handlers.


  private static OWLOntology convert(RDFModel model, OWLOntologyManager manager)
      throws OWLOntologyCreationException, SAXException {
    OWLOntology ontology = manager.createOntology( TMP_URI );


    OWLRDFConsumer consumer = new OWLRDFConsumer( manager, ontology,
        new AnonymousNodeChecker() {
          public boolean isAnonymousNode(URI uri) {
            return isAnonymousNode( uri.toString() );
          }


          public boolean isAnonymousNode(String uri) {
            return uri.startsWith( ANON_URI );
          }
        } );


    consumer.startModel( "" );


    for( Statement stmt : model.getStatements() ) {
      String subj = toString( stmt.getSubject() );
      String pred = toString( stmt.getPredicate() );
      RDFNode vObj = stmt.getObject();
      String obj = toString( vObj );


      if( vObj instanceof Literal ) {
        Literal literal = (Literal) vObj;


        String datatypeURI = literal.getDatatypeURI();
        String lang = literal.getLanguage();
        
        if( lang != null && lang.length() == 0 )
          lang = null;


        consumer.statementWithLiteralValue( subj, pred, obj, lang, datatypeURI );
      }
      else {
        consumer.statementWithResourceValue( subj, pred, obj );
      }
    }


    consumer.endModel();


    return ontology;
  }

Examples of org.coode.owl.rdfxml.parser.OWLRDFConsumer

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