1 files changed, 29 insertions, 0 deletions
diff --git a/container-search/src/main/java/com/yahoo/search/grouping/request/ConstantValue.java b/container-search/src/main/java/com/yahoo/search/grouping/request/ConstantValue.java
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+++ b/container-search/src/main/java/com/yahoo/search/grouping/request/ConstantValue.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.search.grouping.request;
+
+/**
+ * This class represents a constant value in a {@link GroupingExpression}. Because it does not operate on any input,
+ * this expression type can be used at any input level (see {@link GroupingExpression#resolveLevel(int)}). All supported
+ * data types are represented as subclasses of this.
+ *
+ * @author <a href="mailto:simon@yahoo-inc.com">Simon Thoresen</a>
+ */
+@SuppressWarnings("rawtypes")
+public abstract class ConstantValue<T extends Comparable> extends GroupingExpression {
+
+    private final T value;
+
+    protected ConstantValue(T value) {
+        super(asImage(value));
+        this.value = value;
+    }
+
+    /**
+     * Returns the constant value of this.
+     *
+     * @return The value.
+     */
+    public T getValue() {
+        return value;
+    }
+}