bundles/org.simantics.objmap2/src/org/simantics/objmap/structural/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.structural.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 import org.simantics.objmap.graph.rules.domain.IDomainAccessor;\r
  25 import org.simantics.objmap.structural.StructuralResource;\r
  26 \r
  27 \r
  28 public class RelatedValueAccessor implements IDomainAccessor<StructuralResource,Object> {\r
  29 \r
  30     static Logger LOGGER = Logger.getLogger("org.simantics.objmap");\r
  31     \r
  32         Resource relation;\r
  33         Resource valueType;\r
  34         boolean useTypeResource;\r
  35         \r
  36         private boolean preventStructuralChanges = true;\r
  37         private boolean preventStructuralRootChanges = true;\r
  38         \r
  39         public RelatedValueAccessor(Resource relation, Resource valueType, boolean useTypeResource) {\r
  40                 this.relation = relation;\r
  41                 this.valueType = valueType;\r
  42                 this.useTypeResource = useTypeResource;\r
  43         }\r
  44         \r
  45         public RelatedValueAccessor(Resource relation, Resource valueType, boolean useTypeResource, boolean preventStructuralChanges, boolean preventStructuralRootChanges) {\r
  46                 this.relation = relation;\r
  47                 this.valueType = valueType;\r
  48                 this.useTypeResource = useTypeResource;\r
  49                 this.preventStructuralChanges = preventStructuralChanges;\r
  50                 this.preventStructuralRootChanges = preventStructuralRootChanges;\r
  51         }\r
  52         \r
  53         private boolean preventChange(StructuralResource element) {\r
  54         return preventStructuralChanges && element.isStructural() && (!element.isStructuralRoot()||preventStructuralRootChanges);       \r
  55     }\r
  56 \r
  57         @Override\r
  58         public Object get(ReadGraph g, StructuralResource element) throws MappingException {\r
  59                 try {\r
  60                     LOGGER.info("        RelatedValueAccessor.get");\r
  61                     Resource res = getServiceResource(g, element);\r
  62                     if (res == null)\r
  63                         return null;\r
  64                         Resource valueResource = g.getPossibleObject(res, relation);\r
  65                         if(valueResource == null)\r
  66                                 return null;\r
  67                         return g.getValue(valueResource);\r
  68                 } catch (DatabaseException e) {\r
  69                         throw new MappingException(e);\r
  70                 }\r
  71         }\r
  72         \r
  73         @Override\r
  74         public boolean set(WriteGraph g, StructuralResource relement, Object value)\r
  75                         throws MappingException {\r
  76                 try {\r
  77                     LOGGER.info("        RelatedValueAccessor.set");\r
  78                     \r
  79                     Resource element = getServiceResource(g, relement);\r
  80                     if (element == null)\r
  81                         return false;\r
  82                     Statement valueStatement = g.getPossibleStatement(element, relation);\r
  83                         if(valueStatement == null) {\r
  84                                 if(value == null)\r
  85                                         return false;\r
  86                                 if (preventChange(relement))\r
  87                                         return false;\r
  88                                 Resource valueResource = g.newResource();\r
  89                                 g.claim(valueResource, Layer0.getInstance(g).InstanceOf, null,\r
  90                                                 valueType);\r
  91                                 g.claim(element, relation, valueResource);\r
  92                                 g.claimValue(valueResource, value);                             \r
  93                                 return true;\r
  94                         }\r
  95                         else {\r
  96                                 if(value == null) {\r
  97                                         if (preventChange(relement))\r
  98                                                 return false;\r
  99                                         if (!valueStatement.isAsserted(element)) {\r
 100                                                 g.deny(valueStatement.getObject());\r
 101                                                 return true;\r
 102                                         } else {\r
 103                                                 return false;\r
 104                                         }\r
 105                                         \r
 106                                 }                               \r
 107                                 Object currentValue = g.getValue(valueStatement.getObject());\r
 108                                 if(equals(currentValue,value))\r
 109                                         return false;\r
 110                                 if (preventChange(relement))\r
 111                                         return false;\r
 112                                 if (!valueStatement.isAsserted(element))\r
 113                                         g.claimValue(valueStatement.getObject(), value);\r
 114                                 else {\r
 115                                         Resource valueResource = g.newResource();\r
 116                                         g.claim(valueResource, Layer0.getInstance(g).InstanceOf, null,\r
 117                                                         valueType);\r
 118                                         g.claim(element, relation, valueResource);\r
 119                                         g.claimValue(valueResource, value);\r
 120                                 }\r
 121                                 return true;\r
 122                         }\r
 123                 } catch (DatabaseException e) {\r
 124                         throw new MappingException(e);\r
 125                 }\r
 126                 \r
 127         }\r
 128         \r
 129         private Resource getServiceResource(ReadGraph g, StructuralResource element) {\r
 130                 if (!useTypeResource)\r
 131                         return element.getResource();\r
 132                 return element.getTypeResource();\r
 133         }\r
 134         \r
 135         private boolean equals(Object o1, Object o2) {\r
 136                 if (o1 instanceof boolean[])\r
 137                         Arrays.equals((boolean[])o1,(boolean[])o2);\r
 138                 if (o1 instanceof int[])\r
 139                         Arrays.equals((int[])o1,(int[])o2);\r
 140                 if (o1 instanceof float[])\r
 141                         Arrays.equals((float[])o1,(float[])o2);\r
 142                 if (o1 instanceof double[])\r
 143                         Arrays.equals((double[])o1,(double[])o2);\r
 144                 if (o1 instanceof byte[])\r
 145                         Arrays.equals((byte[])o1,(byte[])o2);\r
 146                 return o1.equals(o2);\r
 147                 \r
 148         }\r
 149 \r
 150 }\r