1 files changed, 36 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/context/IndexingService.java b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/context/IndexingService.java
new file mode 100644
index 00000000..8210765d
--- /dev/null
+++ b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/context/IndexingService.java
@@ -0,0 +1,36 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2016, Grill Balázs, IncQueryLabs
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-v20.html.
+ * 
+ * SPDX-License-Identifier: EPL-2.0
+ *******************************************************************************/
+package tools.refinery.viatra.runtime.matchers.context;
+
+/**
+ * These are the different services which can be provided by an {@link IQueryRuntimeContext} implementation.
+ * 
+ * @author Grill Balázs
+ * @since 1.4
+ *
+ */
+public enum IndexingService {
+
+    /**
+     * Cardinality information is available. Makes possible to calculate 
+     * unseeded calls of {@link IQueryRuntimeContext#countTuples(IInputKey, tools.refinery.viatra.runtime.matchers.tuple.Tuple)}
+     */
+    STATISTICS,
+    
+    /**
+     * The indexer can provide notifications about changes in the model.
+     */
+    NOTIFICATIONS,
+    
+    /**
+     * Enables enumeration of instances and reverse-navigation.
+     */
+    INSTANCES
+    
+}