content: // This file is part of AceWiki.
  // Copyright 2008-2013, AceWiki developers.
  // 
  // AceWiki is free software: you can redistribute it and/or modify it under the terms of the GNU
  // Lesser General Public License as published by the Free Software Foundation, either version 3 of
  // the License, or (at your option) any later version.
  // 
  // AceWiki is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
  // even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  // Lesser General Public License for more details.
  // 
  // You should have received a copy of the GNU Lesser General Public License along with AceWiki. If
  // not, see http://www.gnu.org/licenses/.
  
  package ch.uzh.ifi.attempto.acewiki.aceowl;
  
  import org.semanticweb.owlapi.model.OWLAxiom;
  import org.semanticweb.owlapi.model.OWLClassExpression;
  import org.semanticweb.owlapi.model.OWLIndividual;
  import org.semanticweb.owlapi.model.OWLNamedIndividual;
  import org.semanticweb.owlapi.model.OWLObjectOneOf;
  import org.semanticweb.owlapi.model.OWLSubClassOfAxiom;
  
  import ch.uzh.ifi.attempto.acewiki.core.Article;
  import ch.uzh.ifi.attempto.acewiki.owl.OWLQuestion;
  import ch.uzh.ifi.attempto.base.TextContainer;
  
  /**
   * This class represents ACE questions.
   * 
   * @author Tobias Kuhn
   */
  public class ACEQuestion extends ACESentence implements OWLQuestion {
  	
  	private OWLClassExpression questionOWLClass;
  	private OWLNamedIndividual questionOWLIndividual;
  	private boolean recalculateOWLEntities = true;
  
  	/**
  	 * Creates a new ACE question.
  	 * 
  	 * @param serialized The serialized representation of the question.
  	 */
  	public ACEQuestion(String serialized) {
  		super(serialized);
  	}
  
  	/**
  	 * Creates a new ACE question
  	 * 
  	 * @param textContainer The text container with the question text.
  	 */
  	public ACEQuestion(TextContainer textContainer) {
  		super(textContainer);
  	}
  	
  	public OWLClassExpression getQuestionOWLClass() {
  		calculateQuestionOWLEntities();
  		return questionOWLClass;
  	}
  	
  	public OWLNamedIndividual getQuestionOWLIndividual() {
  		calculateQuestionOWLEntities();
  		return questionOWLIndividual;
  	}
  	
  	private void calculateQuestionOWLEntities() {
  		if (!recalculateOWLEntities) return;
  		questionOWLClass = null;
  		questionOWLIndividual = null;
  		
  		OWLSubClassOfAxiom questionOWLAxiom = null;
  		for (OWLAxiom ax : getOWLAxioms()) {
  			if (ax instanceof OWLSubClassOfAxiom) {
  				questionOWLAxiom = (OWLSubClassOfAxiom) ax;
  				break;
  			}
  		}
  		if (questionOWLAxiom != null) {
  			questionOWLClass = questionOWLAxiom.getSubClass();
  		}
  		
  		if (questionOWLClass instanceof OWLObjectOneOf) {
  			OWLObjectOneOf oneof = ((OWLObjectOneOf) questionOWLClass);
  			if (oneof != null && oneof.getIndividuals().size() == 1) {
  				OWLIndividual owlInd = oneof.getIndividuals().iterator().next();
  				if (owlInd instanceof OWLNamedIndividual) {
  					questionOWLIndividual = (OWLNamedIndividual) owlInd;
  				}
  			}
  		}
  		
  		recalculateOWLEntities = false;
  	}
  	
  	public void update() {
  		recalculateOWLEntities = true;
  		super.update();
  	}
  	
  	public boolean isReasonable() {
  		return false;
  	}
  
  	public ACEQuestion copyFor(Article article) {
  		ACEQuestion c = new ACEQuestion(serialize());
  		c.init(getOntology(), article);
  		c.setIntegrated(isIntegrated());
  		return c;
  	}
  
  }
  