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.apache.log4j.Logger;
  17 import org.simantics.db.ReadGraph;
  18 import org.simantics.db.Resource;
  19 import org.simantics.db.Statement;
  20 import org.simantics.db.WriteGraph;
  21 import org.simantics.db.exception.DatabaseException;
  22 import org.simantics.layer0.Layer0;
  23 import org.simantics.objmap.exceptions.MappingException;
  24
  25 /**
  26  * Accesses a value attached to the element by given functional relation.
  27  * @author Hannu Niemist�
  28  */
  29 public class RelatedValueAccessor implements IDomainAccessor<Resource,Object> {
  30
  31     static Logger LOGGER = Logger.getLogger("org.simantics.objmap");
  32
  33         Resource relation;
  34         Resource valueType;
  35
  36         public RelatedValueAccessor(Resource relation, Resource valueType) {
  37                 this.relation = relation;
  38                 this.valueType = valueType;
  39         }
  40
  41         @Override
  42         public Object get(ReadGraph g, Resource element) throws MappingException {
  43                 try {
  44                     LOGGER.info("        RelatedValueAccessor.get");
  45                         Resource valueResource = g.getPossibleObject(element, relation);
  46                         if(valueResource == null)
  47                                 return null;
  48                         return g.getValue(valueResource);
  49                 } catch (DatabaseException e) {
  50                         throw new MappingException(e);
  51                 }
  52         }
  53
  54         @Override
  55         public boolean set(WriteGraph g, Resource element, Object value)
  56                         throws MappingException {
  57                 try {
  58                     LOGGER.info("        RelatedValueAccessor.set");
  59                     Statement valueStatement = g.getPossibleStatement(element, relation);
  60                         if(valueStatement == null) {
  61                                 if(value == null)
  62                                         return false;
  63                                 Resource valueResource = g.newResource();
  64                                 g.claim(valueResource, Layer0.getInstance(g).InstanceOf, null,
  65                                                 valueType);
  66                                 g.claim(element, relation, valueResource);
  67                                 g.claimValue(valueResource, value);
  68                                 return true;
  69                         }
  70                         else {
  71                                 if(value == null) {
  72                                         if (!valueStatement.isAsserted(element)) {
  73                                                 g.deny(valueStatement.getObject());
  74                                                 return true;
  75                                         } else {
  76                                                 return false;
  77                                         }
  78                                 }
  79                                 Object currentValue = g.getValue(valueStatement.getObject());
  80                                 if(equals(currentValue,value))
  81                                         return false;
  82                                 if (!valueStatement.isAsserted(element))
  83                                         g.claimValue(valueStatement.getObject(), value);
  84                                 else {
  85                                         Resource valueResource = g.newResource();
  86                                         g.claim(valueResource, Layer0.getInstance(g).InstanceOf, null,
  87                                                         valueType);
  88                                         g.claim(element, relation, valueResource);
  89                                         g.claimValue(valueResource, value);
  90                                 }
  91                                 return true;
  92                         }
  93                 } catch (DatabaseException e) {
  94                         throw new MappingException(e);
  95                 }
  96
  97         }
  98
  99         private boolean equals(Object o1, Object o2) {
 100                 if (o1 instanceof boolean[])
 101                         Arrays.equals((boolean[])o1,(boolean[])o2);
 102                 if (o1 instanceof int[])
 103                         Arrays.equals((int[])o1,(int[])o2);
 104                 if (o1 instanceof float[])
 105                         Arrays.equals((float[])o1,(float[])o2);
 106                 if (o1 instanceof double[])
 107                         Arrays.equals((double[])o1,(double[])o2);
 108                 if (o1 instanceof byte[])
 109                         Arrays.equals((byte[])o1,(byte[])o2);
 110                 return o1.equals(o2);
 111
 112         }
 113
 114 }