1 files changed, 21 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/index/ProjectionIndexer.java b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/index/ProjectionIndexer.java
new file mode 100644
index 00000000..58e593d9
--- /dev/null
+++ b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/index/ProjectionIndexer.java
@@ -0,0 +1,21 @@
+/*******************************************************************************
+ * Copyright (c) 2004-2009 Gabor Bergmann and Daniel Varro
+ * 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.rete.index;
+
+/**
+ * An iterable indexer that receives updates from a node, and groups received tuples intact, i.e. it does not reduce
+ * tuple groups.
+ * 
+ * @author Gabor Bergmann
+ * 
+ */
+public interface ProjectionIndexer extends IterableIndexer {
+
+}