1 files changed, 32 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/communication/NodeComparator.java b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/communication/NodeComparator.java
new file mode 100644
index 00000000..27779352
--- /dev/null
+++ b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/communication/NodeComparator.java
@@ -0,0 +1,32 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2019, 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.network.communication;
+
+import java.util.Comparator;
+import java.util.Map;
+
+import tools.refinery.viatra.runtime.rete.network.Node;
+
+/**
+ * @since 2.4
+ */
+public class NodeComparator implements Comparator<Node> {
+
+    protected final Map<Node, Integer> nodeMap;
+
+    public NodeComparator(final Map<Node, Integer> nodeMap) {
+        this.nodeMap = nodeMap;
+    }
+
+    @Override
+    public int compare(final Node left, final Node right) {
+        return this.nodeMap.get(left) - this.nodeMap.get(right);
+    }
+    
+}
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