1 files changed, 39 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/base/itc/igraph/ITcObserver.java b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/base/itc/igraph/ITcObserver.java
new file mode 100644
index 00000000..fded53f1
--- /dev/null
+++ b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/base/itc/igraph/ITcObserver.java
@@ -0,0 +1,39 @@
+/*******************************************************************************
+ * 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.base.itc.igraph;
+
+/**
+ * Interface ITcObserver is used to observe the changes in a transitive closure relation; tuple insertion/deletion.
+ * 
+ * @author Szabo Tamas
+ * 
+ */
+public interface ITcObserver<V> {
+
+    /**
+     * Used to notify when a tuple is inserted into the transitive closure relation.
+     * 
+     * @param source
+     *            the source of the tuple
+     * @param target
+     *            the target of the tuple
+     */
+    public void tupleInserted(V source, V target);
+
+    /**
+     * Used to notify when a tuple is deleted from the transitive closure relation.
+     * 
+     * @param source
+     *            the source of the tuple
+     * @param target
+     *            the target of the tuple
+     */
+    public void tupleDeleted(V source, V target);
+}