bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/ValueRule.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2013 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   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
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.objmap.graph.rules;
  13
  14 import org.slf4j.Logger;
  15 import org.slf4j.LoggerFactory;
  16
  17 import java.util.Objects;
  18
  19 import org.simantics.db.ReadGraph;
  20 import org.simantics.db.WriteGraph;
  21 import org.simantics.objmap.backward.IBackwardMapping;
  22 import org.simantics.objmap.bidirectional.IBidirectionalMappingRule;
  23 import org.simantics.objmap.exceptions.MappingException;
  24 import org.simantics.objmap.forward.IForwardMapping;
  25 import org.simantics.objmap.graph.rules.domain.IDomainAccessor;
  26 import org.simantics.objmap.graph.rules.range.IRangeAccessor;
  27
  28
  29 /**
  30  * A rule that synchronizes values between domain and
  31  * range accessors.
  32  * @author Hannu Niemistö
  33  */
  34 public class ValueRule<Domain, Range> implements IBidirectionalMappingRule<Domain, Range> {
  35
  36     static Logger LOGGER = LoggerFactory.getLogger(ValueRule.class);
  37
  38         IDomainAccessor<Domain,Object> domainAccessor;
  39         IRangeAccessor<Range,Object> rangeAccessor;
  40
  41         public ValueRule(IDomainAccessor<Domain,Object> domainAccessor,
  42                         IRangeAccessor<Range,Object> rangeAccessor) {
  43                 this.domainAccessor = domainAccessor;
  44                 this.rangeAccessor = rangeAccessor;
  45         }
  46
  47         @Override
  48         public boolean updateDomain(WriteGraph g, IBackwardMapping<Domain, Range> map,
  49                         Domain domainElement, Range rangeElement)
  50                         throws MappingException {
  51         LOGGER.trace("    ValueRule.updateDomain");
  52                 Object value = rangeAccessor.get(rangeElement);
  53                 return domainAccessor.set(g, domainElement, value);
  54         }
  55
  56         @Override
  57         public boolean updateRange(ReadGraph g, IForwardMapping<Domain, Range> map,
  58                         Domain domainElement, Range rangeElement)
  59                         throws MappingException {
  60         LOGGER.trace("    ValueRule.updateRange");
  61                 Object value = domainAccessor.get(g, domainElement);
  62                 return rangeAccessor.set(rangeElement, value);
  63         }
  64
  65         @Override
  66         public boolean checkChanges(ReadGraph g, IForwardMapping<Domain, Range> map, Domain domainElement,
  67                         Range rangeElement) throws MappingException {
  68                 Object value = rangeAccessor.get(rangeElement);
  69                 return Objects.equals(value, domainAccessor.get(g, domainElement));
  70         }
  71
  72         public void createDomain(WriteGraph g, IBackwardMapping<Domain,Range> map, Domain domainElement, Range rangeElement) throws MappingException {
  73                 updateDomain(g, map, domainElement, rangeElement);
  74         };
  75         public void createRange(ReadGraph g, IForwardMapping<Domain,Range> map, Domain domainElement, Range rangeElement) throws MappingException {
  76                 updateRange(g, map, domainElement, rangeElement);
  77         };
  78 }
  79
  80