Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.db.indexing / src / org / simantics / db / indexing / QueryIndex.java

diff --git a/bundles/org.simantics.db.indexing/src/org/simantics/db/indexing/QueryIndex.java b/bundles/org.simantics.db.indexing/src/org/simantics/db/indexing/QueryIndex.java
new file mode 100644 (file)
index 0000000..2007987
--- /dev/null
+++ b/bundles/org.simantics.db.indexing/src/org/simantics/db/indexing/QueryIndex.java
@@ -0,0 +1,43 @@
+package org.simantics.db.indexing;\r
+\r
+import java.util.Collection;\r
+import java.util.Collections;\r
+import java.util.Map;\r
+\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.common.primitiverequest.Adapter;\r
+import org.simantics.db.common.procedure.adapter.TransientCacheListener;\r
+import org.simantics.db.common.request.BinaryRead;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.operation.Layer0X;\r
+import org.simantics.scl.runtime.function.Function;\r
+\r
+/**\r
+ * A (cacheable) query to optimize single index queries for immutable\r
+ * indexes such as ontologies.\r
+ */\r
+class QueryIndex extends BinaryRead<Resource, String, Collection<Map<String,Object>>> {\r
+\r
+       public QueryIndex(Resource index, String filter) {\r
+               super(index, filter);\r
+       }\r
+\r
+       @Override\r
+       public Collection<Map<String,Object>> perform(ReadGraph graph) throws DatabaseException {\r
+\r
+               Layer0X L0X = Layer0X.getInstance(graph);\r
+\r
+               @SuppressWarnings({ "unchecked", "rawtypes" })\r
+               Function dependencies = graph.syncRequest(new Adapter(L0X.Dependencies, Function.class), TransientCacheListener.<Function>instance());\r
+\r
+               @SuppressWarnings("unchecked")\r
+               Collection<Map<String, Object>> results = (Collection<Map<String, Object>>)dependencies.apply(graph, parameter, parameter2);\r
+               if (results == null || results.isEmpty())\r
+                       return Collections.emptyList();\r
+\r
+               return results;\r
+\r
+       }\r
+\r
+}
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