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

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