forked from github/easyexcel
Jiaju Zhuang
5 years ago
11 changed files with 168 additions and 22 deletions
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package com.alibaba.excel.metadata.format; |
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import java.math.BigDecimal; |
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import java.math.MathContext; |
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import java.math.RoundingMode; |
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import java.text.DecimalFormat; |
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import java.text.DecimalFormatSymbols; |
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import java.text.FieldPosition; |
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import java.text.Format; |
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import java.text.ParsePosition; |
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import java.util.Locale; |
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import org.apache.poi.ss.usermodel.DataFormatter; |
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/** |
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* Written with reference to {@link org.apache.poi.ss.usermodel.ExcelGeneralNumberFormat }. |
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* <p> |
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* Supported Do not use scientific notation. |
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* |
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* @author JiaJu Zhuang |
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**/ |
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public class ExcelGeneralNumberFormat extends Format { |
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private static final long serialVersionUID = 1L; |
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private static final MathContext TO_10_SF = new MathContext(10, RoundingMode.HALF_UP); |
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private final DecimalFormatSymbols decimalSymbols; |
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private final DecimalFormat integerFormat; |
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private final DecimalFormat decimalFormat; |
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private final DecimalFormat scientificFormat; |
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public ExcelGeneralNumberFormat(final Locale locale, final boolean useScientificFormat) { |
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decimalSymbols = DecimalFormatSymbols.getInstance(locale); |
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// Supported Do not use scientific notation.
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if (useScientificFormat) { |
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scientificFormat = new DecimalFormat("0.#####E0", decimalSymbols); |
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} else { |
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scientificFormat = new DecimalFormat("#", decimalSymbols); |
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} |
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org.apache.poi.ss.usermodel.DataFormatter.setExcelStyleRoundingMode(scientificFormat); |
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integerFormat = new DecimalFormat("#", decimalSymbols); |
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org.apache.poi.ss.usermodel.DataFormatter.setExcelStyleRoundingMode(integerFormat); |
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decimalFormat = new DecimalFormat("#.##########", decimalSymbols); |
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DataFormatter.setExcelStyleRoundingMode(decimalFormat); |
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} |
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@Override |
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public StringBuffer format(Object number, StringBuffer toAppendTo, FieldPosition pos) { |
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final double value; |
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if (number instanceof Number) { |
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value = ((Number) number).doubleValue(); |
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if (Double.isInfinite(value) || Double.isNaN(value)) { |
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return integerFormat.format(number, toAppendTo, pos); |
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} |
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} else { |
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// testBug54786 gets here with a date, so retain previous behaviour
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return integerFormat.format(number, toAppendTo, pos); |
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} |
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final double abs = Math.abs(value); |
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if (abs >= 1E11 || (abs <= 1E-10 && abs > 0)) { |
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return scientificFormat.format(number, toAppendTo, pos); |
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} else if (Math.floor(value) == value || abs >= 1E10) { |
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// integer, or integer portion uses all 11 allowed digits
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return integerFormat.format(number, toAppendTo, pos); |
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} |
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// Non-integers of non-scientific magnitude are formatted as "up to 11
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// numeric characters, with the decimal point counting as a numeric
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// character". We know there is a decimal point, so limit to 10 digits.
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// https://support.microsoft.com/en-us/kb/65903
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final double rounded = new BigDecimal(value).round(TO_10_SF).doubleValue(); |
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return decimalFormat.format(rounded, toAppendTo, pos); |
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} |
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@Override |
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public Object parseObject(String source, ParsePosition pos) { |
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throw new UnsupportedOperationException(); |
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} |
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} |
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