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- /* ====================================================================
- Licensed to the Apache Software Foundation (ASF) under one or more
- contributor license agreements. See the NOTICE file distributed with
- 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
- the License. You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
-
- 2012 - Alfresco Software, Ltd.
- Alfresco Software has modified source of this file
- The details of changes as svn diff can be found in svn at location root/projects/3rd-party/src
- ==================================================================== */
- package org.apache.poi.ss.usermodel;
-
- import java.math.BigDecimal;
- import java.math.MathContext;
- import java.math.RoundingMode;
- import java.text.DecimalFormat;
- import java.text.DecimalFormatSymbols;
- import java.text.FieldPosition;
- import java.text.Format;
- import java.text.ParsePosition;
- import java.util.Locale;
-
- /**
- * A format that formats a double as Excel would, ignoring FieldPosition.
- * All other operations are unsupported.
- **/
- public class ExcelGeneralNumberFormat extends Format {
-
- private static final long serialVersionUID = 1L;
-
- private static final MathContext TO_10_SF = new MathContext(10, RoundingMode.HALF_UP);
-
- private final DecimalFormatSymbols decimalSymbols;
- private final DecimalFormat integerFormat;
- private final DecimalFormat decimalFormat;
- private final DecimalFormat scientificFormat;
-
- public ExcelGeneralNumberFormat(final Locale locale) {
- decimalSymbols = DecimalFormatSymbols.getInstance(locale);
- scientificFormat = new DecimalFormat("0.#####E0", decimalSymbols);
- DataFormatter.setExcelStyleRoundingMode(scientificFormat);
- integerFormat = new DecimalFormat("#", decimalSymbols);
- DataFormatter.setExcelStyleRoundingMode(integerFormat);
- decimalFormat = new DecimalFormat("#.##########", decimalSymbols);
- DataFormatter.setExcelStyleRoundingMode(decimalFormat);
- }
-
- @SuppressWarnings("squid:S2111")
- public StringBuffer format(Object number, StringBuffer toAppendTo, FieldPosition pos) {
- final double value;
- if (number instanceof Number) {
- value = ((Number)number).doubleValue();
- if (Double.isInfinite(value) || Double.isNaN(value)) {
- return integerFormat.format(number, toAppendTo, pos);
- }
- } else {
- // testBug54786 gets here with a date, so retain previous behaviour
- return integerFormat.format(number, toAppendTo, pos);
- }
-
- final double abs = Math.abs(value);
- if (abs >= 1E11 || (abs <= 1E-10 && abs > 0)) {
- return scientificFormat.format(number, toAppendTo, pos);
- } else if (Math.floor(value) == value || abs >= 1E10) {
- // integer, or integer portion uses all 11 allowed digits
- return integerFormat.format(number, toAppendTo, pos);
- }
- // Non-integers of non-scientific magnitude are formatted as "up to 11
- // numeric characters, with the decimal point counting as a numeric
- // character". We know there is a decimal point, so limit to 10 digits.
- // https://support.microsoft.com/en-us/kb/65903
- final double rounded = new BigDecimal(value).round(TO_10_SF).doubleValue();
- return decimalFormat.format(rounded, toAppendTo, pos);
- }
-
- public Object parseObject(String source, ParsePosition pos) {
- throw new UnsupportedOperationException();
- }
-
- }
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