1 files changed, 44 insertions, 0 deletions

diff --git a/subprojects/store-reasoning/src/main/java/tools/refinery/store/reasoning/translator/crossreference/UndirectedCrossReferenceRefiner.java b/subprojects/store-reasoning/src/main/java/tools/refinery/store/reasoning/translator/crossreference/UndirectedCrossReferenceRefiner.java
new file mode 100644
index 00000000..43c1462b
--- /dev/null
+++ b/subprojects/store-reasoning/src/main/java/tools/refinery/store/reasoning/translator/crossreference/UndirectedCrossReferenceRefiner.java
@@ -0,0 +1,44 @@
+/*
+ * SPDX-FileCopyrightText: 2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+package tools.refinery.store.reasoning.translator.crossreference;
+
+import tools.refinery.store.reasoning.ReasoningAdapter;
+import tools.refinery.store.reasoning.refinement.ConcreteSymbolRefiner;
+import tools.refinery.store.reasoning.refinement.PartialInterpretationRefiner;
+import tools.refinery.store.reasoning.representation.PartialRelation;
+import tools.refinery.store.reasoning.representation.PartialSymbol;
+import tools.refinery.store.representation.Symbol;
+import tools.refinery.store.representation.TruthValue;
+import tools.refinery.store.tuple.Tuple;
+
+class UndirectedCrossReferenceRefiner extends ConcreteSymbolRefiner<TruthValue, Boolean> {
+        private final PartialInterpretationRefiner<TruthValue, Boolean> sourceRefiner;
+
+        public UndirectedCrossReferenceRefiner(ReasoningAdapter adapter, PartialSymbol<TruthValue, Boolean> partialSymbol,
+                                                                                   Symbol<TruthValue> concreteSymbol, PartialRelation sourceType) {
+                super(adapter, partialSymbol, concreteSymbol);
+                sourceRefiner = adapter.getRefiner(sourceType);
+        }
+
+        @Override
+        public boolean merge(Tuple key, TruthValue value) {
+                int source = key.get(0);
+                int target = key.get(1);
+                if (!super.merge(key, value) || !super.merge(Tuple.of(target, source), value)) {
+                        return false;
+                }
+                if (value.must()) {
+                        return sourceRefiner.merge(Tuple.of(source), TruthValue.TRUE) &&
+                                        sourceRefiner.merge(Tuple.of(target), TruthValue.TRUE);
+                }
+                return true;
+        }
+
+        public static Factory<TruthValue, Boolean> of(Symbol<TruthValue> concreteSymbol, PartialRelation sourceType) {
+                return (adapter, partialSymbol) -> new UndirectedCrossReferenceRefiner(adapter, partialSymbol, concreteSymbol,
+                                sourceType);
+        }
+}