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

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