1package io.protobase.f7.formulas.math;
 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;
 7
 8import java.util.function.BiFunction;
 9import java.util.function.Function;
10
11public class ISEVEN extends AbstractFormula {
12  public static FormulaName NAME = FormulaName.ISEVEN;
13  public static ISEVEN SELF = new ISEVEN();
14
15  public ISEVEN() {
16    super();
17  }
18
19  public ISEVEN(Function<Object, Object> lookup, BiFunction<GridColumnRowKey, Object, Object> collateralLookup) {
20    super(lookup, collateralLookup);
21  }
22
23  @Override
24  public Object internal(GridColumnRowKey origin, Object... values) {
25    checkLength(values.length, 1, NAME);
26    double number = Converters.toDouble(Converters.first(collateralLookup.apply(origin, values[0])));
27    double rounded = Converters.toDouble(ROUNDDOWN.SELF.apply(null, number));
28    double remainder = rounded % 2;
29    return remainder == 0 || remainder == -0;
30  }
31}