1 files changed, 41 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/single/EqualityFilterNode.java b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/single/EqualityFilterNode.java
new file mode 100644
index 00000000..014c2016
--- /dev/null
+++ b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/single/EqualityFilterNode.java
@@ -0,0 +1,41 @@
+/*******************************************************************************
+ * Copyright (c) 2004-2008 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.single;
+
+import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
+import tools.refinery.viatra.runtime.rete.network.ReteContainer;
+
+public class EqualityFilterNode extends FilterNode {
+
+    int[] indices;
+    int first;
+
+    /**
+     * @param reteContainer
+     * @param indices
+     *            indices of the Tuple that should hold equal values
+     */
+    public EqualityFilterNode(ReteContainer reteContainer, int[] indices) {
+        super(reteContainer);
+        this.indices = indices;
+        first = indices[0];
+    }
+
+    @Override
+    public boolean check(Tuple ps) {
+        Object firstElement = ps.get(first);
+        for (int i = 1 /* first is omitted */; i < indices.length; i++) {
+            if (!ps.get(indices[i]).equals(firstElement))
+                return false;
+        }
+        return true;
+    }
+
+}