1 files changed, 31 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/itc/alg/misc/ITcRelation.java b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/itc/alg/misc/ITcRelation.java
new file mode 100644
index 00000000..9fd85ae1
--- /dev/null
+++ b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/itc/alg/misc/ITcRelation.java
@@ -0,0 +1,31 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2012, Tamas Szabo, Istvan Rath 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.itc.alg.misc;
+
+import java.util.Set;
+
+public interface ITcRelation<V> {
+
+    /**
+     * Returns the starting nodes from a transitive closure relation.
+     *
+     * @return the set of starting nodes
+     */
+    public Set<V> getTupleStarts();
+
+    /**
+     * Returns the set of nodes that are reachable from the given node.
+     *
+     * @param start
+     *            the starting node
+     * @return the set of reachable nodes
+     */
+    public Set<V> getTupleEnds(V start);
+}