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src/main/java/io/protobase/f7/formulas/statistical/MIN.java
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1package io.protobase.f7.formulas.statistical;
2
3import io.protobase.f7.formulas.AbstractFormula;
4import io.protobase.f7.formulas.FormulaName;
5import io.protobase.f7.models.GridColumnRowKey;
6import io.protobase.f7.utils.Converters;
7import io.protobase.f7.utils.Mappers;
8
9import java.util.function.BiFunction;
10import java.util.function.Function;
11import java.util.stream.Stream;
12
13public class MIN extends AbstractFormula {
14 public static FormulaName NAME = FormulaName.MIN;
15 public static MIN SELF = new MIN();
16
17 public MIN() {
18 super();
19 }
20
21 public MIN(Function<Object, Object> lookup, BiFunction<GridColumnRowKey, Object, Object> collateralLookup) {
22 super(lookup, collateralLookup);
23 }
24
25 @Override
26 public Object internal(GridColumnRowKey origin, Object... values) {
27 checkAtLeastLength(values.length, 1, NAME);
28 return Stream.of(values)
29 .map(lookup)
30 .flatMap(Mappers::toFlatStreamGridFilterOnlyNumberLiterals)
31 .map(Converters::toDouble)
32 .reduce(Double::min)
33 .orElse(0.0);
34 }
35}