org.mindswap.pellet.jena.graph.query.SubjectObjectVarHandler Maven / Gradle / Ivy
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// 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.Collection;
import java.util.Iterator;
import org.mindswap.pellet.KnowledgeBase;
import org.mindswap.pellet.jena.JenaUtils;
import org.mindswap.pellet.jena.PelletInfGraph;
import org.mindswap.pellet.utils.iterator.NestedIterator;
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;
import com.hp.hpl.jena.util.iterator.WrappedIterator;
abstract class SubjectObjectVarHandler extends TripleQueryHandler {
public abstract Collection getSubjects(KnowledgeBase kb);
public abstract Iterator getObjects(KnowledgeBase kb, ATermAppl subj);
@Override
public final ExtendedIterator find(final KnowledgeBase kb, PelletInfGraph pellet, final Node s, final Node p, final Node o) {
return WrappedIterator.create(
new NestedIterator( getSubjects( kb ) ) {
@Override
public Iterator getInnerIterator(ATermAppl subj) {
Node s = JenaUtils.makeGraphNode( subj );
return objectFiller( s, p, getObjects( kb, subj ) );
}
}
);
}
}