1 files changed, 37 insertions, 0 deletions
diff --git a/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/NameNode.java b/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/NameNode.java
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index 00000000000..eee729fa3a8
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+++ b/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/NameNode.java
@@ -0,0 +1,37 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.searchlib.rankingexpression.rule;
+
+import com.yahoo.searchlib.rankingexpression.evaluation.Context;
+import com.yahoo.searchlib.rankingexpression.evaluation.Value;
+
+import java.util.Deque;
+
+/**
+ * An opaque name in a ranking expression. This is used to represent names passed to the context
+ * and interpreted by the given context in a way which is opaque to the ranking expressions.
+ *
+ * @author <a href="mailto:simon@yahoo-inc.com">Simon Thoresen</a>
+ */
+public final class NameNode extends ExpressionNode {
+
+    private final String name;
+
+    public NameNode(String name) {
+        this.name = name;
+    }
+
+    public String getValue() {
+        return name;
+    }
+
+    @Override
+    public String toString(SerializationContext context, Deque<String> path, CompositeNode parent) {
+        return name;
+    }
+
+    @Override
+    public Value evaluate(Context context) {
+        throw new RuntimeException("Name nodes should never be evaluated");
+    }
+
+}