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.exception.DatabaseException;
23 public class TripletObjectQuery extends TripletInstruction {
25 public TripletObjectQuery(int variable0, int variable1, int variable2) {
26 super(variable0, variable1, variable2);
30 public Object query(ReadGraph g, Object[] bindings) throws DatabaseException {
31 Resource r0 = (Resource)bindings[variable0];
32 Resource r1 = (Resource)bindings[variable1];
33 Collection<Resource> result = g.getObjects(r0, r1);
35 return IInstruction.FAILURE;
36 Iterator<Resource> it = result.iterator();
37 bindings[variable2] = it.next();
44 @SuppressWarnings("unchecked")
46 public Object next(ReadGraph g, Object[] bindings, Object continuation) {
47 Iterator<Resource> it = (Iterator<Resource>)continuation;
49 bindings[variable2] = it.next();
56 return IInstruction.FAILURE;
60 public void collectVariables(TIntHashSet reads, TIntHashSet writes) {
61 super.collectVariables(reads, writes);
62 writes.add(variable2);