bundles/org.simantics.structural2/src/org/simantics/structural2/scl/FindComponentTypeRequest.java

   1 package org.simantics.structural2.scl;
   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.layer0.Layer0;
   8 import org.simantics.structural.stubs.StructuralResource2;
   9 import org.simantics.utils.datastructures.Pair;
  10
  11 /**
  12  * Given component finds a component type it belongs to
  13  */
  14 public class FindComponentTypeRequest extends ResourceRead<Pair<Resource,Integer>> {
  15
  16         public FindComponentTypeRequest(Resource resource) {
  17                 super(resource);
  18         }
  19
  20         @Override
  21         public Pair<Resource,Integer> perform(ReadGraph graph) throws DatabaseException {
  22                 StructuralResource2 STR = StructuralResource2.getInstance(graph);
  23                 Resource type = graph.getPossibleObject(resource, STR.Defines);
  24                 if(type != null)
  25                         return Pair.make(type, 0);
  26
  27                 Layer0 L0 = Layer0.getInstance(graph);
  28                 Resource parent = graph.getPossibleObject(resource, L0.PartOf);
  29                 if(parent != null) {
  30                     Pair<Resource,Integer> result =
  31                             graph.syncRequest(new FindComponentTypeRequest(parent));
  32                         return Pair.make(result.first, result.second+1);
  33                 }
  34
  35                 throw new DatabaseException("Unexpected graph structure at " + resource + ".");
  36         }
  37
  38 }