org.apache.poi.ss.formula.functions.NormSDist Maven / Gradle / Ivy

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   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
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       http://www.apache.org/licenses/LICENSE-2.0

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   distributed under the License is distributed on an "AS IS" BASIS,
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package org.apache.poi.ss.formula.functions;

import org.apache.poi.ss.formula.OperationEvaluationContext;
import org.apache.poi.ss.formula.eval.ErrorEval;
import org.apache.poi.ss.formula.eval.EvaluationException;
import org.apache.poi.ss.formula.eval.NumberEval;
import org.apache.poi.ss.formula.eval.OperandResolver;
import org.apache.poi.ss.formula.eval.ValueEval;

/**
 * Implementation for Excel NORMSDIST() and NORM.S.DIST functions.
 * 
 *   https://support.microsoft.com/en-us/office/normsdist-function-463369ea-0345-445d-802a-4ff0d6ce7cac
 *   https://support.microsoft.com/en-us/office/norm-s-dist-function-1e787282-3832-4520-a9ae-bd2a8d99ba88
 * 
 */
public final class NormSDist extends Fixed1ArgFunction implements FreeRefFunction {

    public static final NormSDist instance = new NormSDist();

    private NormSDist() {}

    @Override
    public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg1) {
        try {
            Double xval = evaluateValue(arg1, srcRowIndex, srcColumnIndex);
            if (xval == null) {
                return ErrorEval.VALUE_INVALID;
            } else if (xval < 0) {
                return ErrorEval.NUM_ERROR;
            }

            return new NumberEval(NormDist.probability(xval.doubleValue(), 0, 1, true));
        } catch (EvaluationException e) {
            return e.getErrorEval();
        }
    }

    @Override
    public ValueEval evaluate(ValueEval[] args, OperationEvaluationContext ec) {
        if (args.length == 1) {
            return evaluate(ec.getRowIndex(), ec.getColumnIndex(), args[0]);
        }

        return ErrorEval.VALUE_INVALID;
    }

    private static Double evaluateValue(ValueEval arg, int srcRowIndex, int srcColumnIndex) throws EvaluationException {
        ValueEval veText = OperandResolver.getSingleValue(arg, srcRowIndex, srcColumnIndex);
        String strText1 = OperandResolver.coerceValueToString(veText);
        return OperandResolver.parseDouble(strText1);
    }
}