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

   1 package org.simantics.db.layer0.request;
   2
   3 import java.util.Collection;
   4 import java.util.Collections;
   5 import java.util.HashSet;
   6 import java.util.Map;
   7 import java.util.Set;
   8
   9 import org.simantics.db.ReadGraph;
  10 import org.simantics.db.Resource;
  11 import org.simantics.db.common.request.ResourceRead2;
  12 import org.simantics.db.exception.DatabaseException;
  13 import org.simantics.db.layer0.genericrelation.IndexQueries;
  14 import org.simantics.layer0.Layer0;
  15 import org.simantics.operation.Layer0X;
  16 import org.simantics.scl.runtime.function.Function;
  17
  18 public class IndexedInstances extends ResourceRead2<Set<Resource>> {
  19
  20         public IndexedInstances(Resource type, Resource indexRoot) {
  21                 super(type, indexRoot);
  22         }
  23
  24         @Override
  25         public Set<Resource> perform(ReadGraph graph) throws DatabaseException {
  26
  27         Layer0 L0 = Layer0.getInstance(graph);
  28         Layer0X L0X = Layer0X.getInstance(graph);
  29
  30         String typeName = graph.getRelatedValue(resource, L0.HasName);
  31
  32         Function dependencies = graph.adapt(L0X.Dependencies, Function.class);
  33
  34         Collection<Map<String, Object>> results = (Collection<Map<String, Object>>)dependencies.apply(graph, resource2, "Types:" + IndexQueries.quoteTerm(typeName));
  35         if (results == null)
  36             return Collections.emptySet();
  37
  38         HashSet<Resource> result = new HashSet<Resource>(results.size());
  39         for(Map<String, Object> entry : results) {
  40             Resource res = (Resource)entry.get("Resource");
  41             if(res != null) {
  42                 if (graph.isInstanceOf(res, resource))
  43                         result.add(res);
  44             }
  45         }
  46         return result;
  47
  48         }
  49
  50 }