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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.Arrays;
/**
* This class represents a reverse-function in a {@link GroupingExpression}. It evaluates to a list that equals the list
* result of the argument, sorted in descending order.
*
* @author baldersheim
* @author bratseth
*/
public class ReverseFunction extends FunctionNode {
/**
* Constructs a new instance of this class.
*
* @param exp The expression to evaluate, must evaluate to a list.
*/
public ReverseFunction(GroupingExpression exp) {
this(null, null, exp);
}
private ReverseFunction(String label, Integer level, GroupingExpression exp) {
super("reverse", label, level, Arrays.asList(exp));
}
@Override
public ReverseFunction copy() {
return new ReverseFunction(getLabel(), getLevelOrNull(), getArg(0).copy());
}
}
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