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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 predefined bucket-function in a {@link GroupingExpression} for expressions that evaluate to a
* double.
*
* @author Simon Thoresen Hult
*/
public class DoublePredefined extends PredefinedFunction {
/**
* Constructs a new instance of this class.
*
* @param exp The expression to evaluate, must evaluate to a double.
* @param arg1 The compulsory bucket.
* @param argN The optional buckets.
*/
public DoublePredefined(GroupingExpression exp, DoubleBucket arg1, DoubleBucket... argN) {
this(null, null, exp, asList(arg1, argN));
}
private DoublePredefined(String label, Integer level, GroupingExpression exp, List<DoubleBucket> args) {
super(label, level, exp, args);
}
@Override
public DoublePredefined copy() {
return new DoublePredefined(getLabel(),
getLevelOrNull(),
getArg(0),
args().stream().skip(1)
.map(DoubleBucket.class::cast)
.map(arg -> arg.copy())
.toList());
}
@Override
public DoubleBucket getBucket(int i) {
return (DoubleBucket)getArg(i + 1);
}
/**
* Constructs a new instance of this class from a list of arguments.
*
* @param exp The expression to evaluate, must evaluate to a double.
* @param args The buckets to pass to the constructor.
* @return The created instance.
* @throws IllegalArgumentException Thrown if the list of buckets is empty.
*/
public static DoublePredefined newInstance(GroupingExpression exp, List<DoubleBucket> args) {
if (args.isEmpty()) {
throw new IllegalArgumentException("Expected at least one bucket, got none.");
}
return new DoublePredefined(null, null, exp, args);
}
}
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