bundles/org.simantics.db.indexing/src/org/simantics/db/indexing/QueryIndex.java

   1 package org.simantics.db.indexing;
   2
   3 import java.util.Collection;
   4 import java.util.Collections;
   5 import java.util.Map;
   6
   7 import org.simantics.db.ReadGraph;
   8 import org.simantics.db.Resource;
   9 import org.simantics.db.common.primitiverequest.Adapter;
  10 import org.simantics.db.common.procedure.adapter.TransientCacheListener;
  11 import org.simantics.db.common.request.BinaryRead;
  12 import org.simantics.db.exception.DatabaseException;
  13 import org.simantics.operation.Layer0X;
  14 import org.simantics.scl.runtime.function.Function;
  15
  16 /**
  17  * A (cacheable) query to optimize single index queries for immutable
  18  * indexes such as ontologies.
  19  */
  20 class QueryIndex extends BinaryRead<Resource, String, Collection<Map<String,Object>>> {
  21
  22         public QueryIndex(Resource index, String filter) {
  23                 super(index, filter);
  24         }
  25
  26         @Override
  27         public Collection<Map<String,Object>> perform(ReadGraph graph) throws DatabaseException {
  28
  29                 Layer0X L0X = Layer0X.getInstance(graph);
  30
  31                 @SuppressWarnings({ "unchecked", "rawtypes" })
  32                 Function dependencies = graph.syncRequest(new Adapter(L0X.Dependencies, Function.class), TransientCacheListener.<Function>instance());
  33
  34                 @SuppressWarnings("unchecked")
  35                 Collection<Map<String, Object>> results = (Collection<Map<String, Object>>)dependencies.apply(graph, parameter, parameter2);
  36                 if (results == null || results.isEmpty())
  37                         return Collections.emptyList();
  38
  39                 return results;
  40
  41         }
  42
  43 }