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1 files changed, 38 insertions, 0 deletions

diff --git a/searchlib/src/main/java/com/yahoo/searchlib/expression/SingleResultNode.java b/searchlib/src/main/java/com/yahoo/searchlib/expression/SingleResultNode.java
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+++ b/searchlib/src/main/java/com/yahoo/searchlib/expression/SingleResultNode.java
@@ -0,0 +1,38 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.searchlib.expression;
+
+/**
+ * @author <a href="mailto:balder@yahoo-inc.com">Henning Baldersheim</a>
+ */
+public abstract class SingleResultNode extends ResultNode {
+    // The global class identifier shared with C++.
+    public static final int classId = registerClass(0x4000 + 121, NumericResultNode.class);
+
+    /**
+     * In-place addition of this result with another.
+     *
+     * @param rhs The result to add to this.
+     */
+    public abstract void add(ResultNode rhs);
+
+    /**
+     * Swaps the numerical value of this node with the smaller of this and the other.
+     *
+     * @param rhs The other result to evaluate.
+     */
+    public abstract void min(ResultNode rhs);
+
+    /**
+     * Swaps the numerical value of this node with the larger of this and the other.
+     *
+     * @param rhs The other result to evaluate.
+     */
+    public abstract void max(ResultNode rhs);
+
+    /**
+     * Return a java native, either String, Double or Long, depending on the underlying container.
+     *
+     * @return The underlying numeric value.
+     */
+    public abstract Object getValue();
+}