1 files changed, 40 insertions, 0 deletions

diff --git a/subprojects/logic/src/main/java/tools/refinery/logic/valuation/ValuationBuilder.java b/subprojects/logic/src/main/java/tools/refinery/logic/valuation/ValuationBuilder.java
new file mode 100644
index 00000000..46459ac7
--- /dev/null
+++ b/subprojects/logic/src/main/java/tools/refinery/logic/valuation/ValuationBuilder.java
@@ -0,0 +1,40 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+package tools.refinery.logic.valuation;
+
+import tools.refinery.logic.term.AnyDataVariable;
+import tools.refinery.logic.term.DataVariable;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
+public class ValuationBuilder {
+        private final Map<AnyDataVariable, Object> values = new HashMap<>();
+
+        ValuationBuilder() {
+        }
+
+        public <T> ValuationBuilder put(DataVariable<T> variable, T value) {
+                return putChecked(variable, value);
+        }
+
+        public ValuationBuilder putChecked(AnyDataVariable variable, Object value) {
+                if (value != null && !variable.getType().isInstance(value)) {
+                        throw new IllegalArgumentException("Value %s is not an instance of %s"
+                                        .formatted(value, variable.getType().getName()));
+                }
+                if (values.containsKey(variable)) {
+                        throw new IllegalArgumentException("Already has value for variable %s".formatted(variable));
+                }
+                values.put(variable, value);
+                return this;
+        }
+
+        public Valuation build() {
+                return new MapBasedValuation(Collections.unmodifiableMap(values));
+        }
+}