bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/RelatedValueAccessor.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2013 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.objmap.graph.rules.domain;\r
  13 \r
  14 import java.util.Arrays;\r
  15 \r
  16 import org.apache.log4j.Logger;\r
  17 import org.simantics.db.ReadGraph;\r
  18 import org.simantics.db.Resource;\r
  19 import org.simantics.db.Statement;\r
  20 import org.simantics.db.WriteGraph;\r
  21 import org.simantics.db.exception.DatabaseException;\r
  22 import org.simantics.layer0.Layer0;\r
  23 import org.simantics.objmap.exceptions.MappingException;\r
  24 \r
  25 /**\r
  26  * Accesses a value attached to the element by given functional relation.\r
  27  * @author Hannu Niemist�\r
  28  */\r
  29 public class RelatedValueAccessor implements IDomainAccessor<Resource,Object> {\r
  30 \r
  31     static Logger LOGGER = Logger.getLogger("org.simantics.objmap");\r
  32     \r
  33         Resource relation;\r
  34         Resource valueType;\r
  35 \r
  36         public RelatedValueAccessor(Resource relation, Resource valueType) {\r
  37                 this.relation = relation;\r
  38                 this.valueType = valueType;\r
  39         }\r
  40 \r
  41         @Override\r
  42         public Object get(ReadGraph g, Resource element) throws MappingException {\r
  43                 try {\r
  44                     LOGGER.info("        RelatedValueAccessor.get");\r
  45                         Resource valueResource = g.getPossibleObject(element, relation);\r
  46                         if(valueResource == null)\r
  47                                 return null;\r
  48                         return g.getValue(valueResource);\r
  49                 } catch (DatabaseException e) {\r
  50                         throw new MappingException(e);\r
  51                 }\r
  52         }\r
  53         \r
  54         @Override\r
  55         public boolean set(WriteGraph g, Resource element, Object value)\r
  56                         throws MappingException {\r
  57                 try {\r
  58                     LOGGER.info("        RelatedValueAccessor.set");\r
  59                     Statement valueStatement = g.getPossibleStatement(element, relation);\r
  60                         if(valueStatement == null) {\r
  61                                 if(value == null)\r
  62                                         return false;\r
  63                                 Resource valueResource = g.newResource();\r
  64                                 g.claim(valueResource, Layer0.getInstance(g).InstanceOf, null,\r
  65                                                 valueType);\r
  66                                 g.claim(element, relation, valueResource);\r
  67                                 g.claimValue(valueResource, value);                             \r
  68                                 return true;\r
  69                         }\r
  70                         else {\r
  71                                 if(value == null) {\r
  72                                         if (!valueStatement.isAsserted(element)) {\r
  73                                                 g.deny(valueStatement.getObject());\r
  74                                                 return true;\r
  75                                         } else {\r
  76                                                 return false;\r
  77                                         }\r
  78                                 }                               \r
  79                                 Object currentValue = g.getValue(valueStatement.getObject());\r
  80                                 if(equals(currentValue,value))\r
  81                                         return false;\r
  82                                 if (!valueStatement.isAsserted(element))\r
  83                                         g.claimValue(valueStatement.getObject(), value);\r
  84                                 else {\r
  85                                         Resource valueResource = g.newResource();\r
  86                                         g.claim(valueResource, Layer0.getInstance(g).InstanceOf, null,\r
  87                                                         valueType);\r
  88                                         g.claim(element, relation, valueResource);\r
  89                                         g.claimValue(valueResource, value);\r
  90                                 }\r
  91                                 return true;\r
  92                         }\r
  93                 } catch (DatabaseException e) {\r
  94                         throw new MappingException(e);\r
  95                 }\r
  96                 \r
  97         }\r
  98         \r
  99         private boolean equals(Object o1, Object o2) {\r
 100                 if (o1 instanceof boolean[])\r
 101                         Arrays.equals((boolean[])o1,(boolean[])o2);\r
 102                 if (o1 instanceof int[])\r
 103                         Arrays.equals((int[])o1,(int[])o2);\r
 104                 if (o1 instanceof float[])\r
 105                         Arrays.equals((float[])o1,(float[])o2);\r
 106                 if (o1 instanceof double[])\r
 107                         Arrays.equals((double[])o1,(double[])o2);\r
 108                 if (o1 instanceof byte[])\r
 109                         Arrays.equals((byte[])o1,(byte[])o2);\r
 110                 return o1.equals(o2);\r
 111                 \r
 112         }\r
 113 \r
 114 }\r