1 /*******************************************************************************
2 * Copyright (c) 2007, 2013 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.objmap.graph.rules;
14 import java.util.ArrayList;
15 import java.util.Collection;
17 import org.simantics.db.ReadGraph;
18 import org.simantics.db.WriteGraph;
19 import org.simantics.objmap.backward.IBackwardMapping;
20 import org.simantics.objmap.bidirectional.IBidirectionalMappingRule;
21 import org.simantics.objmap.exceptions.MappingException;
22 import org.simantics.objmap.forward.IForwardMapping;
23 import org.simantics.objmap.graph.rules.domain.IDomainAccessor;
24 import org.simantics.objmap.graph.rules.range.IRangeAccessor;
25 import org.slf4j.Logger;
26 import org.slf4j.LoggerFactory;
30 * A rule that synchronizes collection of elements between
31 * domain and range accessors. Elements are mapped from
32 * between domain and range during the synchronization.
33 * @author Hannu Niemistö
35 public class MappedElementsRule<Domain, Range> implements IBidirectionalMappingRule<Domain, Range> {
37 static final Logger LOGGER = LoggerFactory.getLogger(MappedElementsRule.class);
39 IDomainAccessor<Domain,Collection<Domain>> domainAccessor;
40 IRangeAccessor<Range,Collection<Range>> rangeAccessor;
42 public MappedElementsRule(IDomainAccessor<Domain,Collection<Domain>> domainAccessor,
43 IRangeAccessor<Range,Collection<Range>> rangeAccessor) {
44 this.domainAccessor = domainAccessor;
45 this.rangeAccessor = rangeAccessor;
49 public boolean updateDomain(WriteGraph g, IBackwardMapping<Domain, Range> map,
50 Domain domainElement, Range rangeElement)
51 throws MappingException {
52 LOGGER.info(" MappedElementsRule.updateDomain");
53 // Snapshot the accessed range value for concurrency safety.
54 // NOTE: still assumes that the accessed collection is concurrent or
55 // synchronized for toArray to be atomic.
56 Collection<Range> value = rangeAccessor.get(rangeElement);
57 Object[] rangeSnapshot = value.toArray();
58 ArrayList<Domain> mappedValue = new ArrayList<Domain>(rangeSnapshot.length);
59 for (Object obj : rangeSnapshot)
60 mappedValue.add(map.inverseMap(g, (Range)obj));//map.inverseGet((Range)obj));
61 return domainAccessor.set(g, domainElement, mappedValue);
65 public boolean updateRange(ReadGraph g, IForwardMapping<Domain, Range> map,
66 Domain domainElement, Range rangeElement)
67 throws MappingException {
68 LOGGER.info(" MappedElementsRule.updateRange");
69 Collection<Domain> value = domainAccessor.get(g, domainElement);
70 ArrayList<Range> mappedValue = new ArrayList<Range>(value.size());
72 mappedValue.add(map.map(g, r));//map.get(r));
73 return rangeAccessor.set(rangeElement, mappedValue);
76 public void createDomain(WriteGraph g, IBackwardMapping<Domain,Range> map, Domain domainElement, Range rangeElement) throws MappingException {
77 updateDomain(g, map, domainElement, rangeElement);
80 public void createRange(ReadGraph g, IForwardMapping<Domain,Range> map, Domain domainElement, Range rangeElement) throws MappingException {
81 updateRange(g, map, domainElement, rangeElement);