Examples of org.semanticweb.owl.util.OWLEntityCollector

org.semanticweb.owl.util.OWLEntityCollector
Author: Matthew Horridge
The University Of Manchester
Bio-Health Informatics Group
Date: 13-Nov-2006

A utiliity class that visits axioms, descriptions etc. and accumulates the named objects that are referred to in those axioms, descriptions etc. For example, if the collector visited the axiom (propP some C) subClassOf (propQ some D), it would contain the objects propP, C, propQ and D.

     * @return <code>true</code> if the description references entities that
     *         the ontology that contains entailments which are being explained,
     *         otherwise <code>false</code>
     */
    public static boolean containsUnreferencedEntity(OWLOntology ontology, OWLDescription desc) {
        OWLEntityCollector entityCollector = new OWLEntityCollector();
        desc.accept(entityCollector);
        for (OWLEntity entity : entityCollector.getObjects()) {
            if (!ontology.containsEntityReference(entity)) {
                if (entity instanceof OWLClass && (((OWLClass) entity).isOWLThing() || ((OWLClass) entity).isOWLNothing())) {
                    continue;
                }
                return true;

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  private static OWLEntityCollector collector;  
  
    public HSTExplanationGenerator(TransactionAwareSingleExpGen singleExplanationGenerator) {
        this.singleExplanationGenerator = singleExplanationGenerator;
        
        collector  = new OWLEntityCollector();
        collector.setCollectDataTypes( false );
    }

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   * @return <code>true</code> if the description references entities that
   *         the ontology that contains entailments which are being explained,
   *         otherwise <code>false</code>
   */
  public static boolean containsUnreferencedEntity(OWLOntology ontology, OWLDescription desc) {
    OWLEntityCollector entityCollector = new OWLEntityCollector();
    desc.accept( entityCollector );
    for( OWLEntity entity : entityCollector.getObjects() ) {
      if( !ontology.containsEntityReference( entity ) ) {
        if( entity instanceof OWLClass
            && (((OWLClass) entity).isOWLThing() || ((OWLClass) entity).isOWLNothing()) ) {
          continue;
        }

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