Finds out the number format in String format, and parse the number to BigDecimal format. - Java java.math

Java examples for java.math:BigDecimal Convert

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Description

Finds out the number format in String format, and parse the number to BigDecimal format.

Demo Code

// Copyright 2013 Google Inc. All Rights Reserved.
//package com.java2s;
import java.math.BigDecimal;
import java.math.MathContext;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.NumberFormat;
import java.text.ParseException;

public class Main {


    /**/*  w ww  .jav a 2 s  . c  o  m*/
     * Finds out the number format in {@code String} format, and parse the number to
     * {@code BigDecimal} format.
     *
     *  The passed number can contain white spaces of any sort, and can have the default separators
     * such as ',' and '.'.
     *
     * @param numberString the number in {@code String} format
     * @return the {@code BigDecimal} that was parsed from the {@code String}. If the number format is
     *         not recognized, than {@code null} is returned.
     */
    public static BigDecimal parseFromNumberString(String numberString) {

        if (numberString != null) {

            String nonSpacedString = numberString.replaceAll(
                    "[ \\t\\n\\x0B\\f\\r]", "").replaceAll("%", "");

            int indexOfComma = nonSpacedString.indexOf(',');
            int indexOfDot = nonSpacedString.indexOf('.');
            NumberFormat format = null;

            if (indexOfComma < indexOfDot) {
                nonSpacedString = nonSpacedString.replaceAll("[,]", "");

                DecimalFormatSymbols otherSymbols = new DecimalFormatSymbols();
                otherSymbols.setDecimalSeparator('.');
                format = new DecimalFormat("##.#", otherSymbols);

            } else if (indexOfComma > indexOfDot) {
                nonSpacedString = nonSpacedString.replaceAll("[.]", "");

                DecimalFormatSymbols otherSymbols = new DecimalFormatSymbols();
                otherSymbols.setDecimalSeparator(',');
                format = new DecimalFormat("##,#", otherSymbols);

            } else {
                format = new DecimalFormat();
            }

            try {
                return new BigDecimal(format.parse(nonSpacedString)
                        .doubleValue(), new MathContext(12));

            } catch (ParseException e) {
                // unrecognized number format
                return null;
            }
        }
        return null;
    }
}

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