org.mindswap.pellet.jena.graph.query.SubjectVarHandler Maven / Gradle / Ivy
// Copyright (c) 2006 - 2008, Clark & Parsia, LLC.
// This source code is available under the terms of the Affero General Public License v3.
//
// Please see LICENSE.txt for full license terms, including the availability of proprietary exceptions.
// Questions, comments, or requests for clarification: [email protected]
package org.mindswap.pellet.jena.graph.query;
import java.util.Set;
import org.mindswap.pellet.KnowledgeBase;
import org.mindswap.pellet.jena.graph.loader.GraphLoader;
import aterm.ATermAppl;
import com.hp.hpl.jena.graph.Node;
import com.hp.hpl.jena.graph.Triple;
import com.hp.hpl.jena.util.iterator.ExtendedIterator;
abstract class SubjectVarHandler extends TripleQueryHandler {
public abstract Set getSubjects(KnowledgeBase kb, ATermAppl obj);
@Override
public final boolean contains(KnowledgeBase kb, GraphLoader loader, Node subj, Node pred, Node obj) {
return !getSubjects( kb, loader.node2term( obj ) ).isEmpty();
}
@Override
public final ExtendedIterator find(KnowledgeBase kb, GraphLoader loader, Node subj, Node pred, Node obj) {
return subjectFiller( getSubjects( kb, loader.node2term( obj ) ), pred, obj );
}
}