1 files changed, 17 insertions, 1 deletions

diff --git a/subprojects/store-reasoning/src/main/java/tools/refinery/store/reasoning/translator/typehierarchy/InferredMayTypeView.java b/subprojects/store-reasoning/src/main/java/tools/refinery/store/reasoning/translator/typehierarchy/InferredMayTypeView.java
index ce2d6ff3..40de4644 100644
--- a/subprojects/store-reasoning/src/main/java/tools/refinery/store/reasoning/translator/typehierarchy/InferredMayTypeView.java
+++ b/subprojects/store-reasoning/src/main/java/tools/refinery/store/reasoning/translator/typehierarchy/InferredMayTypeView.java
@@ -9,6 +9,8 @@ import tools.refinery.store.reasoning.representation.PartialRelation;
 import tools.refinery.store.query.view.TuplePreservingView;
 import tools.refinery.store.tuple.Tuple;
 
+import java.util.Objects;
+
 class InferredMayTypeView extends TuplePreservingView<InferredType> {
         private final PartialRelation type;
 
@@ -18,7 +20,21 @@ class InferredMayTypeView extends TuplePreservingView<InferredType> {
         }
 
         @Override
-        public boolean filter(Tuple key, InferredType value) {
+        protected boolean doFilter(Tuple key, InferredType value) {
                 return value.mayConcreteTypes().contains(type);
         }
+
+        @Override
+        public boolean equals(Object o) {
+                if (this == o) return true;
+                if (o == null || getClass() != o.getClass()) return false;
+                if (!super.equals(o)) return false;
+                InferredMayTypeView that = (InferredMayTypeView) o;
+                return Objects.equals(type, that.type);
+        }
+
+        @Override
+        public int hashCode() {
+                return Objects.hash(super.hashCode(), type);
+        }
 }