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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 fixed-width bucket-function in a {@link GroupingExpression}. It maps the input into the given
* number of buckets by the result of the argument expression.
*
* @author Simon Thoresen Hult
*/
public class FixedWidthFunction extends FunctionNode {
/**
* Constructs a new instance of this class.
*
* @param exp The expression to evaluate.
* @param width The width of each bucket.
*/
public FixedWidthFunction(GroupingExpression exp, Number width) {
this(null, null, exp,
width instanceof Double ? new DoubleValue(width.doubleValue()) : new LongValue(width.longValue()));
}
private FixedWidthFunction(String label, Integer level, GroupingExpression exp, ConstantValue width) {
super("fixedwidth", label, level, Arrays.asList(exp, width));
}
@Override
public FixedWidthFunction copy() {
return new FixedWidthFunction(getLabel(), getLevelOrNull(), getArg(0).copy(), (ConstantValue)getArg(1).copy());
}
/**
* Returns the number of buckets to divide the result into.
*
* @return The bucket count.
*/
public Number getWidth() {
GroupingExpression w = getArg(1);
return (w instanceof LongValue) ? ((LongValue)w).getValue() : ((DoubleValue)w).getValue();
}
}
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