1package io.protobase.f7.formulas.math;
 2
 3import io.protobase.f7.errors.DivException;
 4import io.protobase.f7.formulas.AbstractFormula;
 5import io.protobase.f7.formulas.FormulaName;
 6import io.protobase.f7.models.GridColumnRowKey;
 7import io.protobase.f7.utils.Converters;
 8import io.protobase.f7.utils.NumberUtils;
 9
10import java.util.function.BiFunction;
11import java.util.function.Function;
12
13public class COT extends AbstractFormula {
14  public static FormulaName NAME = FormulaName.COT;
15  public static COT SELF = new COT();
16
17  public COT() {
18    super();
19  }
20
21  public COT(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    checkLength(values.length, 1, NAME);
28    double divisor = Math.tan(Converters.toDouble(Converters.first(collateralLookup.apply(origin, values[0]))));
29    if (NumberUtils.isZero(divisor)) {
30      return new DivException("Evaluation of COT caused a divide by zero error.");
31    }
32    return 1 / divisor;
33  }
34}