bundles/org.simantics.db.common/src/org/simantics/db/common/request/IndexRoots.java

   1 package org.simantics.db.common.request;
   2
   3 import java.util.Collection;
   4 import java.util.Collections;
   5
   6 import org.simantics.db.ReadGraph;
   7 import org.simantics.db.Resource;
   8 import org.simantics.db.ResourceSet;
   9 import org.simantics.db.common.procedure.adapter.TransientCacheAsyncListener;
  10 import org.simantics.db.exception.DatabaseException;
  11 import org.simantics.db.service.CollectionSupport;
  12 import org.simantics.layer0.Layer0;
  13
  14 public class IndexRoots extends ResourceRead<Collection<Resource>> {
  15
  16         public IndexRoots(Resource r) {
  17                 super(r);
  18         }
  19
  20         @Override
  21         public Collection<Resource> perform(ReadGraph graph) throws DatabaseException {
  22                 Layer0 L0 = Layer0.getInstance(graph);
  23                 if (graph.isInstanceOf(resource, L0.IndexRoot))
  24                         return Collections.singletonList(resource);
  25                 CollectionSupport cs = graph.getService(CollectionSupport.class);
  26                 ResourceSet types = cs.getResourceSet(graph, L0.IndexRoot);
  27                 ResourceSetGraph rsg = graph.syncRequest(new DependentInstances3(resource), TransientCacheAsyncListener.<ResourceSetGraph>instance());
  28                 return rsg.resolve(graph, types);
  29         }
  30
  31 }