code: package it.unibz.inf.ontop.protege.action;
  
  /*
   * #%L
   * ontop-protege4
   * %%
   * Copyright (C) 2009 - 2013 KRDB Research Centre. Free University of Bozen Bolzano.
   * %%
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   * 
   *      http://www.apache.org/licenses/LICENSE-2.0
   * 
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   * #L%
   */
  
  import it.unibz.inf.ontop.protege.core.OntopProtegeReasoner;
  import it.unibz.inf.ontop.protege.utils.DialogUtils;
  import org.protege.editor.core.ui.action.ProtegeAction;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.awt.event.ActionEvent;
  import java.util.Optional;
  
  public class InconsistencyCheckAction extends ProtegeAction {
  	
  	private static final long serialVersionUID = 1L;
  
  	private static final Logger LOGGER = LoggerFactory.getLogger(InconsistencyCheckAction.class);
  
  	private static final String DIALOG_TITlE = "Consistency checking";
  
  	@Override
  	public void actionPerformed(ActionEvent evt) {
  		Optional<OntopProtegeReasoner> reasoner = DialogUtils.getOntopProtegeReasoner(getEditorKit());
  		if (!reasoner.isPresent())
  			return;
  
  		try {
  			OntopProtegeReasoner ontop = reasoner.get();
  			boolean isConsistent = ontop.isQuestConsistent();
  			LOGGER.debug("Consistency checking returned: " + isConsistent);
  			if (isConsistent) {
  				DialogUtils.showInfoDialog(getWorkspace(),
  						"Your ontology is consistent! Top job!",
  						DIALOG_TITlE);
  			}
  			else {
  				DialogUtils.showInfoDialog(getWorkspace(),
  						"Your ontology is not consistent.\n" +
  								"The axiom causing inconsistency is:\n" +
  								ontop.getInconsistentAxiom(),
  						DIALOG_TITlE);
  			}
  		}
  		catch (Throwable e) {
  			DialogUtils.showQuickErrorDialog(getWorkspace(), e, DIALOG_TITlE + " error.");
  		}
  	}
  
  	@Override
  	public void initialise()  { /* NO-OP */ }
  
  	@Override
  	public void dispose()  {/* NO-OP */}
  }
  