1 files changed, 64 insertions, 0 deletions
diff --git a/config-lib/src/main/java/com/yahoo/config/ModelNode.java b/config-lib/src/main/java/com/yahoo/config/ModelNode.java
new file mode 100644
index 00000000000..775c4a12e82
--- /dev/null
+++ b/config-lib/src/main/java/com/yahoo/config/ModelNode.java
@@ -0,0 +1,64 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.config;
+
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Represents a 'model' in a {@link ConfigInstance}.
+ *
+ * @author bratseth
+ */
+public class ModelNode extends LeafNode<ModelReference> {
+
+    public ModelNode() {
+        this.value = null;
+    }
+
+    public ModelNode(ModelReference modelReference) {
+        super(true);
+        this.value = modelReference;
+    }
+
+    public ModelReference value() {
+        return value;
+    }
+
+    @Override
+    public String getValue() {
+        return value.toString();
+    }
+
+    @Override
+    public String toString() {
+        return (value == null) ? "(null)" : '"' + getValue() + '"';
+    }
+
+    @Override
+    protected boolean doSetValue(String stringVal) {
+        throw new UnsupportedOperationException();
+    }
+
+    public ModelReference getModelReference() {
+        return value;
+    }
+
+    public static List<ModelReference> toModelReferences(List<ModelNode> modelNodes) {
+        List<ModelReference> modelReferences = new ArrayList<>();
+        for (ModelNode modelNode : modelNodes)
+            modelReferences.add(modelNode.getModelReference());
+        return modelReferences;
+    }
+
+    public static Map<String, ModelReference> toModelReferenceMap(Map<String, ModelNode> nodeMap) {
+        Map<String, ModelReference> referenceMap = new LinkedHashMap<>();
+        for (var entry : nodeMap.entrySet()) {
+            referenceMap.put(entry.getKey(), entry.getValue().getModelReference());
+        }
+        return referenceMap;
+    }
+
+}