1 files changed, 34 insertions, 0 deletions

diff --git a/subprojects/logic/src/main/java/tools/refinery/logic/literal/AbstractLiteral.java b/subprojects/logic/src/main/java/tools/refinery/logic/literal/AbstractLiteral.java
new file mode 100644
index 00000000..79100e40
--- /dev/null
+++ b/subprojects/logic/src/main/java/tools/refinery/logic/literal/AbstractLiteral.java
@@ -0,0 +1,34 @@
+/*
+ * SPDX-FileCopyrightText: 2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+package tools.refinery.logic.literal;
+
+import tools.refinery.logic.equality.LiteralEqualityHelper;
+import tools.refinery.logic.equality.LiteralHashCodeHelper;
+
+public abstract class AbstractLiteral implements Literal {
+        @Override
+        public boolean equalsWithSubstitution(LiteralEqualityHelper helper, Literal other) {
+                return other != null && getClass() == other.getClass();
+        }
+
+        @Override
+        public int hashCodeWithSubstitution(LiteralHashCodeHelper helper) {
+                return getClass().hashCode();
+        }
+
+        @Override
+        public boolean equals(Object o) {
+                if (this == o) return true;
+                if (o == null || getClass() != o.getClass()) return false;
+                AbstractLiteral that = (AbstractLiteral) o;
+                return equalsWithSubstitution(LiteralEqualityHelper.DEFAULT, that);
+        }
+
+        @Override
+        public int hashCode() {
+                return hashCodeWithSubstitution(LiteralHashCodeHelper.DEFAULT);
+        }
+}