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

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