1 files changed, 27 insertions, 0 deletions

diff --git a/subprojects/logic/src/main/java/tools/refinery/logic/equality/LiteralEqualityHelper.java b/subprojects/logic/src/main/java/tools/refinery/logic/equality/LiteralEqualityHelper.java
new file mode 100644
index 00000000..ea62061e
--- /dev/null
+++ b/subprojects/logic/src/main/java/tools/refinery/logic/equality/LiteralEqualityHelper.java
@@ -0,0 +1,27 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+package tools.refinery.logic.equality;
+
+import tools.refinery.logic.dnf.Dnf;
+import tools.refinery.logic.term.Variable;
+
+import java.util.Objects;
+
+public interface LiteralEqualityHelper extends DnfEqualityChecker {
+        LiteralEqualityHelper DEFAULT = new LiteralEqualityHelper() {
+                @Override
+                public boolean variableEqual(Variable left, Variable right) {
+                        return Objects.equals(left, right);
+                }
+
+                @Override
+                public boolean dnfEqual(Dnf left, Dnf right) {
+                        return DnfEqualityChecker.DEFAULT.dnfEqual(left, right);
+                }
+        };
+
+        boolean variableEqual(Variable left, Variable right);
+}