Publish

1 files changed, 42 insertions, 0 deletions

diff --git a/container-search/src/main/java/com/yahoo/search/grouping/request/AvgFunction.java b/container-search/src/main/java/com/yahoo/search/grouping/request/AvgFunction.java
new file mode 100644
index 00000000000..c0474064741
--- /dev/null
+++ b/container-search/src/main/java/com/yahoo/search/grouping/request/AvgFunction.java
@@ -0,0 +1,42 @@
+// 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;
+
+import java.util.List;
+
+/**
+ * This class represents a min-function in a {@link GroupingExpression}. It evaluates to a number that equals the
+ * average of the results of all arguments.
+ *
+ * @author <a href="mailto:simon@yahoo-inc.com">Simon Thoresen</a>
+ */
+public class AvgFunction extends FunctionNode {
+
+    /**
+     * Constructs a new instance of this class.
+     *
+     * @param arg1 The first compulsory argument, must evaluate to a number.
+     * @param arg2 The second compulsory argument, must evaluate to a number.
+     * @param argN The optional arguments, must evaluate to a number.
+     */
+    public AvgFunction(GroupingExpression arg1, GroupingExpression arg2, GroupingExpression... argN) {
+        this(asList(arg1, arg2, argN));
+    }
+
+    private AvgFunction(List<GroupingExpression> args) {
+        super("avg", args);
+    }
+
+    /**
+     * Constructs a new instance of this class from a list of arguments.
+     *
+     * @param args The arguments to pass to the constructor.
+     * @return The created instance.
+     * @throws IllegalArgumentException Thrown if the number of arguments is less than 2.
+     */
+    public static AvgFunction newInstance(List<GroupingExpression> args) {
+        if (args.size() < 2) {
+            throw new IllegalArgumentException("Expected 2 or more arguments, got " + args.size() + ".");
+        }
+        return new AvgFunction(args);
+    }
+}