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// Copyright Yahoo. 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
* long.
*
* @author Simon Thoresen Hult
* @author bratseth
*/
public class LongPredefined extends PredefinedFunction {
/**
* Constructs a new instance of this class.
*
* @param exp The expression to evaluate, must evaluate to a long.
* @param arg1 The compulsory bucket.
* @param argN The optional buckets.
*/
public LongPredefined(GroupingExpression exp, LongBucket arg1, LongBucket... argN) {
this(null, null, exp, asList(arg1, argN));
}
private LongPredefined(String label, Integer level, GroupingExpression exp, List<LongBucket> args) {
super(label, level, exp, args);
}
@Override
public LongPredefined copy() {
return new LongPredefined(getLabel(),
getLevelOrNull(),
getArg(0),
args().stream()
.skip(1)
.map(LongBucket.class::cast)
.map(arg -> arg.copy())
.toList());
}
@Override
public LongBucket getBucket(int i) {
return (LongBucket)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 long.
* @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 LongPredefined newInstance(GroupingExpression exp, List<LongBucket> args) {
if (args.isEmpty()) {
throw new IllegalArgumentException("Expected at least one bucket, got none.");
}
return new LongPredefined(null, null, exp, args);
}
}
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