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1 files changed, 54 insertions, 0 deletions

diff --git a/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/ConstantNode.java b/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/ConstantNode.java
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+++ b/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/ConstantNode.java
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+// 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;
+
+/**
+ * A node which holds a constant (frozen) value.
+ *
+ * @author <a href="mailto:simon@yahoo-inc.com">Simon Thoresen</a>
+ */
+public final class ConstantNode extends ExpressionNode {
+
+    private final String sourceImage;
+
+    private final Value value;
+
+    public ConstantNode(Value value) {
+        this(value,null);
+    }
+
+    /**
+     * Creates a constant value
+     *
+     * @param value the value. Ownership of this value is transferred to this.
+     * @param sourceImage the source string image producing this value
+     */
+    public ConstantNode(Value value, String sourceImage) {
+        value.freeze();
+        this.value=value;
+        this.sourceImage=sourceImage;
+    }
+
+    public Value getValue() { return value; }
+
+    @Override
+    public String toString(SerializationContext context, Deque<String> path, CompositeNode parent) {
+        return sourceString();
+    }
+
+    /** Returns the string which created this, or the value.toString() if not known */
+    public String sourceString() {
+        if (sourceImage != null) return sourceImage;
+        return value.toString();
+    }
+
+    @Override
+    public Value evaluate(Context context) {
+        return value;
+    }
+
+}