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Drools implementation of SWRLAPI-based SWRL rule engine

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package org.swrlapi.drools.owl.properties;

import org.checkerframework.checker.nullness.qual.NonNull;
import org.semanticweb.owlapi.model.OWLObjectProperty;
import org.semanticweb.owlapi.vocab.OWLRDFVocabulary;
import org.swrlapi.builtins.arguments.SWRLBuiltInArgument;
import org.swrlapi.drools.extractors.DroolsOWLEntityExtractor;
import org.swrlapi.drools.extractors.DroolsSWRLBuiltInArgumentExtractor;
import org.swrlapi.drools.owl.core.OE;
import org.swrlapi.drools.swrl.BA;
import org.swrlapi.exceptions.TargetSWRLRuleEngineException;
import org.swrlapi.exceptions.TargetSWRLRuleEngineInternalException;

/**
 * This class represents an OWL object property in Drools.
 *
 * @see org.semanticweb.owlapi.model.OWLObjectProperty
 */
public class OP extends OE implements P, OPE
{
  private static final long serialVersionUID = 1L;

  public OP(@NonNull String propertyName)
  {
    super(propertyName);
  }

  /*
   * We have no way of anticipating the return types of built-ins in rules so we need to perform a runtime check.
   */
  public OP(@NonNull BA ba)
  {
    super("");

    if (ba instanceof OP) {
      OP p = (OP)ba;
      this.id = p.getName();
    } else
      throw new TargetSWRLRuleEngineInternalException(
        "expecting OWL object property from bound built-in argument, got " + ba.getClass().getCanonicalName());
  }

  @NonNull @Override public OWLObjectProperty extract(@NonNull DroolsOWLEntityExtractor extractor)
    throws TargetSWRLRuleEngineException
  {
    return extractor.extract(this);
  }

  @NonNull @Override public SWRLBuiltInArgument extract(@NonNull DroolsSWRLBuiltInArgumentExtractor extractor)
    throws TargetSWRLRuleEngineException
  {
    return extractor.extract(this);
  }

  @NonNull public static OP getOWLTopObjectProperty()
  {
    return new OP(OWLRDFVocabulary.OWL_TOP_OBJECT_PROPERTY.getPrefixedName());
  }

  @NonNull public static OP getOWLBottomObjectProperty()
  {
    return new OP(OWLRDFVocabulary.OWL_BOTTOM_DATA_PROPERTY.getPrefixedName());
  }
}