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src/main/java/io/protobase/f7/formulas/math/ROUND.java
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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.math.BigDecimal;
9import java.math.RoundingMode;
10import java.util.function.BiFunction;
11import java.util.function.Function;
12
13public class ROUND extends AbstractFormula {
14 public static FormulaName NAME = FormulaName.ROUND;
15 public static ROUND SELF = new ROUND();
16
17 public ROUND() {
18 super();
19 }
20
21 public ROUND(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 checkLengthBetween(values.length, 1, 2, NAME);
28 Object value = Converters.first(collateralLookup.apply(origin, values[0]));
29 if (values.length == 1) {
30 return ((double) Math.round(Converters.toDouble(value)));
31 }
32 Double placesRaw = Converters.toDouble(Converters.first(collateralLookup.apply(origin, values[1])));
33 int places;
34 if (placesRaw > 0) {
35 places = new Double(Math.floor(placesRaw.floatValue())).intValue();
36 } else {
37 places = new Double(Math.ceil(placesRaw.floatValue())).intValue();
38 }
39 BigDecimal bd = new BigDecimal(Converters.toDouble(value));
40 bd = bd.setScale(places, RoundingMode.HALF_UP);
41 return bd.doubleValue();
42 }
43}