90 lines
3.9 KiB
Java
90 lines
3.9 KiB
Java
/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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2012 - Alfresco Software, Ltd.
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Alfresco Software has modified source of this file
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The details of changes as svn diff can be found in svn at location root/projects/3rd-party/src
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==================================================================== */
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package org.apache.poi.ss.usermodel;
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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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/**
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* A format that formats a double as Excel would, ignoring FieldPosition.
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* All other operations are unsupported.
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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) {
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decimalSymbols = DecimalFormatSymbols.getInstance(locale);
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scientificFormat = new DecimalFormat("0.#####E0", decimalSymbols);
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DataFormatter.setExcelStyleRoundingMode(scientificFormat);
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integerFormat = new DecimalFormat("#", decimalSymbols);
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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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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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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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