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;
16 import java.util.Objects;
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;
26 import org.slf4j.Logger;
27 import org.slf4j.LoggerFactory;
31 * A rule that synchronizes collection of elements between
32 * domain and range accessors. Elements are mapped from
33 * between domain and range during the synchronization.
34 * @author Hannu Niemistö
36 public class MappedElementsRule<Domain, Range> implements IBidirectionalMappingRule<Domain, Range> {
38 static final Logger LOGGER = LoggerFactory.getLogger(MappedElementsRule.class);
40 IDomainAccessor<Domain,Collection<Domain>> domainAccessor;
41 IRangeAccessor<Range,Collection<Range>> rangeAccessor;
43 public MappedElementsRule(IDomainAccessor<Domain,Collection<Domain>> domainAccessor,
44 IRangeAccessor<Range,Collection<Range>> rangeAccessor) {
45 this.domainAccessor = domainAccessor;
46 this.rangeAccessor = rangeAccessor;
50 public boolean updateDomain(WriteGraph g, IBackwardMapping<Domain, Range> map,
51 Domain domainElement, Range rangeElement)
52 throws MappingException {
53 LOGGER.trace(" MappedElementsRule.updateDomain");
54 // Snapshot the accessed range value for concurrency safety.
55 // NOTE: still assumes that the accessed collection is concurrent or
56 // synchronized for toArray to be atomic.
57 Collection<Range> value = rangeAccessor.get(rangeElement);
58 Object[] rangeSnapshot = value.toArray();
59 ArrayList<Domain> mappedValue = new ArrayList<Domain>(rangeSnapshot.length);
60 for (Object obj : rangeSnapshot)
61 mappedValue.add(map.inverseMap(g, (Range)obj));//map.inverseGet((Range)obj));
62 return domainAccessor.set(g, domainElement, mappedValue);
66 public boolean updateRange(ReadGraph g, IForwardMapping<Domain, Range> map,
67 Domain domainElement, Range rangeElement)
68 throws MappingException {
69 LOGGER.trace(" MappedElementsRule.updateRange");
70 ArrayList<Range> mappedValue = getMappedValue(g, map, domainElement);
71 return rangeAccessor.set(rangeElement, mappedValue);
75 public boolean checkChanges(ReadGraph g, IForwardMapping<Domain, Range> map, Domain domainElement, Range rangeElement) throws MappingException {
76 LOGGER.trace(" MappedElementsRule.updateRange");
77 ArrayList<Range> mappedValue = getMappedValue(g, map, domainElement);
78 return !Objects.equals(mappedValue, rangeAccessor.get(rangeElement));
81 private ArrayList<Range> getMappedValue(ReadGraph g, IForwardMapping<Domain, Range> map, Domain domainElement)
82 throws MappingException {
83 Collection<Domain> value = domainAccessor.get(g, domainElement);
84 ArrayList<Range> mappedValue = new ArrayList<Range>(value.size());
86 mappedValue.add(map.map(g, r));//map.get(r));
90 public void createDomain(WriteGraph g, IBackwardMapping<Domain,Range> map, Domain domainElement, Range rangeElement) throws MappingException {
91 updateDomain(g, map, domainElement, rangeElement);
94 public void createRange(ReadGraph g, IForwardMapping<Domain,Range> map, Domain domainElement, Range rangeElement) throws MappingException {
95 updateRange(g, map, domainElement, rangeElement);