1 files changed, 52 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/single/InequalityFilterNode.java b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/single/InequalityFilterNode.java
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index 00000000..8dd3e949
--- /dev/null
+++ b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/single/InequalityFilterNode.java
@@ -0,0 +1,52 @@
+/*******************************************************************************
+ * 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.matchers.tuple.TupleMask;
+import tools.refinery.viatra.runtime.rete.network.ReteContainer;
+
+/**
+ * This node filters patterns according to equalities and inequalities of elements. The 'subject' element is asserted to
+ * be different from the elements given by the inequalityMask.
+ * 
+ * 
+ * @author Gabor Bergmann
+ * 
+ */
+public class InequalityFilterNode extends FilterNode {
+
+    int subjectIndex;
+    TupleMask inequalityMask;
+
+    /**
+     * @param reteContainer
+     * @param subject
+     *            the index of the element that should be compared.
+     * @param inequalityMask
+     *            the indices of elements that should be different from the subjectIndex.
+     */
+    public InequalityFilterNode(ReteContainer reteContainer, int subject, TupleMask inequalityMask) {
+        super(reteContainer);
+        this.subjectIndex = subject;
+        this.inequalityMask = inequalityMask;
+    }
+
+    @Override
+    public boolean check(Tuple ps) {
+        Object subject = ps.get(subjectIndex);
+        for (int ineq : inequalityMask.indices) {
+            if (subject.equals(ps.get(ineq)))
+                return false;
+        }
+        return true;
+    }
+
+}