1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.mapping.constraint.instructions;
14 import gnu.trove.set.hash.TIntHashSet;
16 import java.util.Collection;
17 import java.util.Iterator;
19 import org.simantics.db.ReadGraph;
20 import org.simantics.db.Resource;
21 import org.simantics.db.Statement;
22 import org.simantics.db.exception.DatabaseException;
23 import org.simantics.layer0.Layer0;
25 public class TripletSubjectPredicateQuery extends TripletInstruction {
29 public TripletSubjectPredicateQuery(int variable0, int variable1, int variable2,
31 super(variable0, variable1, variable2);
32 this.predicate = predicate;
35 public TripletSubjectPredicateQuery(int variable0, int variable1, int variable2) {
36 this(variable0, variable1, variable2, null);
40 public Object query(ReadGraph g, Object[] bindings) throws DatabaseException {
41 Resource r2 = (Resource)bindings[variable2];
42 // ITask task = ThreadLogger.getInstance().begin("g");
43 Collection<Statement> result =
45 ? g.getStatements(r2, Layer0.getInstance(g).IsWeaklyRelatedTo)
46 : g.getStatements(r2, g.getInverse(predicate));
49 return IInstruction.FAILURE;
50 Iterator<Statement> it = result.iterator();
51 Statement stat = it.next();
52 bindings[variable1] = g.getInverse(stat.getPredicate());
53 bindings[variable0] = stat.getObject();
60 @SuppressWarnings("unchecked")
62 public Object next(ReadGraph g, Object[] bindings, Object continuation) throws DatabaseException {
63 Iterator<Statement> it = (Iterator<Statement>)continuation;
65 Statement stat = it.next();
66 bindings[variable1] = g.getInverse(stat.getPredicate());
67 bindings[variable0] = stat.getObject();
74 return IInstruction.FAILURE;
78 public void collectVariables(TIntHashSet reads, TIntHashSet writes) {
79 super.collectVariables(reads, writes);
80 writes.add(variable0);
81 writes.add(variable1);