bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/RelatedValueAccessor.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.domain;
  13
  14 import java.util.Arrays;
  15
  16 import org.slf4j.Logger;
  17 import org.slf4j.LoggerFactory;
  18 import org.simantics.db.ReadGraph;
  19 import org.simantics.db.Resource;
  20 import org.simantics.db.Statement;
  21 import org.simantics.db.WriteGraph;
  22 import org.simantics.db.exception.DatabaseException;
  23 import org.simantics.layer0.Layer0;
  24 import org.simantics.objmap.exceptions.MappingException;
  25
  26 /**
  27  * Accesses a value attached to the element by given functional relation.
  28  * @author Hannu Niemist�
  29  */
  30 public class RelatedValueAccessor implements IDomainAccessor<Resource,Object> {
  31
  32     static Logger LOGGER = LoggerFactory.getLogger(RelatedValueAccessor.class);
  33
  34         Resource relation;
  35         Resource valueType;
  36
  37         public RelatedValueAccessor(Resource relation, Resource valueType) {
  38                 this.relation = relation;
  39                 this.valueType = valueType;
  40         }
  41
  42         @Override
  43         public Object get(ReadGraph g, Resource element) throws MappingException {
  44                 try {
  45                     LOGGER.info("        RelatedValueAccessor.get");
  46                         Resource valueResource = g.getPossibleObject(element, relation);
  47                         if(valueResource == null)
  48                                 return null;
  49                         return g.getValue(valueResource);
  50                 } catch (DatabaseException e) {
  51                         throw new MappingException(e);
  52                 }
  53         }
  54
  55         @Override
  56         public boolean set(WriteGraph g, Resource element, Object value)
  57                         throws MappingException {
  58                 try {
  59                     LOGGER.info("        RelatedValueAccessor.set");
  60                     Statement valueStatement = g.getPossibleStatement(element, relation);
  61                         if(valueStatement == null) {
  62                                 if(value == null)
  63                                         return false;
  64                                 Resource valueResource = g.newResource();
  65                                 g.claim(valueResource, Layer0.getInstance(g).InstanceOf, null,
  66                                                 valueType);
  67                                 g.claim(element, relation, valueResource);
  68                                 g.claimValue(valueResource, value);
  69                                 return true;
  70                         }
  71                         else {
  72                                 if(value == null) {
  73                                         if (!valueStatement.isAsserted(element)) {
  74                                                 g.deny(valueStatement.getObject());
  75                                                 return true;
  76                                         } else {
  77                                                 return false;
  78                                         }
  79                                 }
  80                                 Object currentValue = g.getValue(valueStatement.getObject());
  81                                 if(equals(currentValue,value))
  82                                         return false;
  83                                 if (!valueStatement.isAsserted(element))
  84                                         g.claimValue(valueStatement.getObject(), value);
  85                                 else {
  86                                         Resource valueResource = g.newResource();
  87                                         g.claim(valueResource, Layer0.getInstance(g).InstanceOf, null,
  88                                                         valueType);
  89                                         g.claim(element, relation, valueResource);
  90                                         g.claimValue(valueResource, value);
  91                                 }
  92                                 return true;
  93                         }
  94                 } catch (DatabaseException e) {
  95                         throw new MappingException(e);
  96                 }
  97
  98         }
  99
 100         private boolean equals(Object o1, Object o2) {
 101                 if (o1 instanceof boolean[])
 102                         Arrays.equals((boolean[])o1,(boolean[])o2);
 103                 if (o1 instanceof int[])
 104                         Arrays.equals((int[])o1,(int[])o2);
 105                 if (o1 instanceof float[])
 106                         Arrays.equals((float[])o1,(float[])o2);
 107                 if (o1 instanceof double[])
 108                         Arrays.equals((double[])o1,(double[])o2);
 109                 if (o1 instanceof byte[])
 110                         Arrays.equals((byte[])o1,(byte[])o2);
 111                 return o1.equals(o2);
 112
 113         }
 114
 115 }