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

   1 package org.simantics.db.layer0.request;\r
   2 \r
   3 import java.util.Collection;\r
   4 \r
   5 import org.simantics.db.ReadGraph;\r
   6 import org.simantics.db.Resource;\r
   7 import org.simantics.db.common.request.ResourceRead2;\r
   8 import org.simantics.db.exception.DatabaseException;\r
   9 import org.simantics.layer0.Layer0;\r
  10 \r
  11 public class IsLinkedTo extends ResourceRead2<Boolean> {\r
  12 \r
  13         public IsLinkedTo(Resource resource, Resource resource2) {\r
  14                 super(resource, resource2);\r
  15         }\r
  16 \r
  17         @Override\r
  18         public Boolean perform(ReadGraph graph) throws DatabaseException {\r
  19                 if(resource.equals(resource2)) return true;\r
  20                 Layer0 L0 = Layer0.getInstance(graph);\r
  21                 Collection<Resource> links = graph.getObjects(resource, L0.IsLinkedTo);\r
  22                 for(Resource link : links) {\r
  23                         if(link.equals(resource2)) return true;\r
  24                 }\r
  25                 for(Resource link : links) {\r
  26                         if(graph.syncRequest(new IsLinkedTo(link, resource2))) return true;\r
  27                 }\r
  28                 return false;\r
  29         }\r
  30 \r
  31 }\r