package tudelft.healthpsychology.traumaontologies.answerstate;

import java.util.Collection;
import java.util.List;

import org.semanticweb.owlapi.model.OWLClass;

import tudelft.utilities.tree.TreeNode;

/**
 * This is a node (class) in the ontology. The ontology builds a tree of terms
 * and subterms, eg "Apparatus" would be a term and "Vacuum cleaner" a subterm
 * of it. The IRI contains eg "#Apparatus" and should refer properly to the IRIs
 * in the ontology. <br>
 * This class abstracts away all database querying and RDF stuff, facilitating
 * testing and code readability.
 * 
 * The nodes in the ontology graph have properties. These properties are
 * questions to be filled in separately.
 * 
 * We use a String as label of the nodes that are referring to {@link OWLClass}
 * objects.
 * 
 */
public interface OntologyNode extends TreeNode<String, Collection<Property>> {

	/**
	 * @param depth Must be positive or 0. 0 means node itself, 1 means direct
	 *              children, 2 means children of the children, etc.
	 * @return list with only this node if this is a leaf node or depth=0. If
	 *         this is not a leaf node, then returns a list joining all
	 *         getChildren(depth-1) of each child.
	 */
	List<OntologyNode> getChildren(int depth);

	/**
	 * @return the parent of this node. Null if no such node eg if this is the
	 *         root node.
	 */
	OntologyNode getParent();

}