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.apache.log4j.Logger;
18 import org.simantics.db.ReadGraph;
19 import org.simantics.db.WriteGraph;
20 import org.simantics.objmap.backward.IBackwardMapping;
21 import org.simantics.objmap.bidirectional.IBidirectionalMappingRule;
22 import org.simantics.objmap.exceptions.MappingException;
23 import org.simantics.objmap.forward.IForwardMapping;
24 import org.simantics.objmap.graph.rules.domain.IDomainAccessor;
25 import org.simantics.objmap.graph.rules.range.IRangeAccessor;
29 * A rule that synchronizes collection of elements between
30 * domain and range accessors. Elements are mapped from
31 * between domain and range during the synchronization.
32 * @author Hannu Niemistö
34 public class MappedElementsRule<Domain, Range> implements IBidirectionalMappingRule<Domain, Range> {
36 static Logger LOGGER = Logger.getLogger("org.simantics.objmap");
38 IDomainAccessor<Domain,Collection<Domain>> domainAccessor;
39 IRangeAccessor<Range,Collection<Range>> rangeAccessor;
41 public MappedElementsRule(IDomainAccessor<Domain,Collection<Domain>> domainAccessor,
42 IRangeAccessor<Range,Collection<Range>> rangeAccessor) {
43 this.domainAccessor = domainAccessor;
44 this.rangeAccessor = rangeAccessor;
48 public boolean updateDomain(WriteGraph g, IBackwardMapping<Domain, Range> map,
49 Domain domainElement, Range rangeElement)
50 throws MappingException {
51 LOGGER.info(" MappedElementsRule.updateDomain");
52 // Snapshot the accessed range value for concurrency safety.
53 // NOTE: still assumes that the accessed collection is concurrent or
54 // synchronized for toArray to be atomic.
55 Collection<Range> value = rangeAccessor.get(rangeElement);
56 Object[] rangeSnapshot = value.toArray();
57 ArrayList<Domain> mappedValue = new ArrayList<Domain>(rangeSnapshot.length);
58 for (Object obj : rangeSnapshot)
59 mappedValue.add(map.inverseMap(g, (Range)obj));//map.inverseGet((Range)obj));
60 return domainAccessor.set(g, domainElement, mappedValue);
64 public boolean updateRange(ReadGraph g, IForwardMapping<Domain, Range> map,
65 Domain domainElement, Range rangeElement)
66 throws MappingException {
67 LOGGER.info(" MappedElementsRule.updateRange");
68 Collection<Domain> value = domainAccessor.get(g, domainElement);
69 ArrayList<Range> mappedValue = new ArrayList<Range>(value.size());
71 mappedValue.add(map.map(g, r));//map.get(r));
72 return rangeAccessor.set(rangeElement, mappedValue);
75 public void createDomain(WriteGraph g, IBackwardMapping<Domain,Range> map, Domain domainElement, Range rangeElement) throws MappingException {
76 updateDomain(g, map, domainElement, rangeElement);
79 public void createRange(ReadGraph g, IForwardMapping<Domain,Range> map, Domain domainElement, Range rangeElement) throws MappingException {
80 updateRange(g, map, domainElement, rangeElement);