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// Copyright Vespa.ai. 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;
import java.util.stream.Collectors;
/**
* 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 Simon Thoresen Hult
* @author bratseth
*/
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(null, null, asList(arg1, arg2, argN));
}
private AvgFunction(String label, Integer level, List<GroupingExpression> args) {
super("avg", label, level, args);
}
@Override
public AvgFunction copy() {
return new AvgFunction(getLabel(),
getLevelOrNull(),
args().stream().map(arg -> arg.copy()).toList());
}
/**
* 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(null, null, args);
}
}
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