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 MINA extends AbstractFormula {
14  public static FormulaName NAME = FormulaName.MINA;
15  public static MINA SELF = new MINA();
16
17  public MINA() {
18    super();
19  }
20
21  public MINA(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::toFlatStreamFilterOnlyNumeric)
31        .map(Converters::toDouble)
32        .reduce(Double::min)
33        .orElse(0.0);
34  }
35}