1 package org.simantics.db.indexing;
3 import java.util.Collection;
4 import java.util.Collections;
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;
17 * A (cacheable) query to optimize single index queries for immutable
18 * indexes such as ontologies.
20 class QueryIndex extends BinaryRead<Resource, String, Collection<Map<String,Object>>> {
22 public QueryIndex(Resource index, String filter) {
27 public Collection<Map<String,Object>> perform(ReadGraph graph) throws DatabaseException {
29 Layer0X L0X = Layer0X.getInstance(graph);
31 @SuppressWarnings({ "unchecked", "rawtypes" })
32 Function dependencies = graph.syncRequest(new Adapter(L0X.Dependencies, Function.class), TransientCacheListener.<Function>instance());
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();