1 /*******************************************************************************
2 * Copyright (c) 2012, 2013 Association for Decentralized Information Management in
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.objmap.internal;
14 import gnu.trove.map.hash.THashMap;
16 import java.util.Collections;
19 import org.simantics.db.WriteGraph;
20 import org.simantics.objmap.backward.IBackwardLinkType;
21 import org.simantics.objmap.backward.IBackwardMapping;
22 import org.simantics.objmap.backward.IBackwardMappingSchema;
23 import org.simantics.objmap.exceptions.MappingException;
26 * An unidirectional (from range to domain) mapping that does not support removals.
28 * @author Hannu Niemistö
30 public class MonotoneBackwardMapping<Domain, Range> implements IBackwardMapping<Domain, Range> {
32 IBackwardMappingSchema<Domain, Range> schema;
33 THashMap<Range, Domain> map = new THashMap<Range, Domain>();
35 public MonotoneBackwardMapping(IBackwardMappingSchema<Domain, Range> schema) {
40 public Set<Range> getRange() {
41 return Collections.unmodifiableSet(map.keySet());
45 public Domain inverseGet(Range rangeElement) {
46 return map.get(rangeElement);
50 public Domain inverseMap(WriteGraph graph, Range rangeElement) throws MappingException {
51 Domain result = inverseGet(rangeElement);
53 IBackwardLinkType<Domain, Range> linkType =
54 schema.linkTypeOfRangeElement(graph, rangeElement);
55 // Two phase creation makes cyclic references possible
56 Domain domainElement = linkType.createDomainElement(graph, rangeElement);
57 map.put(rangeElement, domainElement);
58 linkType.createDomain(graph, this, domainElement, rangeElement);