bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/ResourceToPossibleVariable.java

   1 package org.simantics.db.layer0.request;\r
   2 \r
   3 import org.simantics.db.ReadGraph;\r
   4 import org.simantics.db.Resource;\r
   5 import org.simantics.db.common.request.ResourceRead;\r
   6 import org.simantics.db.exception.DatabaseException;\r
   7 import org.simantics.db.layer0.variable.StandardGraphChildVariable;\r
   8 import org.simantics.db.layer0.variable.Variable;\r
   9 import org.simantics.layer0.Layer0;\r
  10 \r
  11 public class ResourceToPossibleVariable extends ResourceRead<Variable> {\r
  12 \r
  13         public ResourceToPossibleVariable(Resource resource) {\r
  14                 super(resource);\r
  15         }\r
  16         \r
  17         @Override\r
  18         public Variable perform(ReadGraph graph) throws DatabaseException {\r
  19                 \r
  20                 Layer0 L0 = Layer0.getInstance(graph);\r
  21                 Resource parent = graph.getPossibleObject(resource, L0.PartOf);\r
  22                 if(parent == null) {\r
  23                         if(graph.getRootLibrary().equals(resource)) return new StandardGraphChildVariable(null, null, graph.getRootLibrary());\r
  24                         else return null;\r
  25                 }\r
  26                 Variable parentVariable = graph.syncRequest(new ResourceToPossibleVariable(parent));\r
  27                 if(parentVariable == null) return null;\r
  28                 return parentVariable.browsePossible(graph, resource);\r
  29                 \r
  30         }\r
  31 \r
  32 }\r