org.apache.tika.parser.microsoft.TikaExcelGeneralFormat Maven / Gradle / Ivy
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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.
*/
package org.apache.tika.parser.microsoft;
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;
import org.apache.poi.ss.usermodel.DataFormatter;
/**
* A Format that allows up to 15 significant digits for integers.
* This goes against the Microsoft spec, but it preserves information
* for long strings of digits.
*
* This was derived from POI's ExcelGeneralNumberFormat
*/
public class TikaExcelGeneralFormat extends Format {
private static final long serialVersionUID = 1L;
private static final MathContext TO_15_SF = new MathContext(15, RoundingMode.HALF_UP);
private final DecimalFormatSymbols decimalSymbols;
private final DecimalFormat integerFormat;
private final DecimalFormat decimalFormat;
private final DecimalFormat scientificFormat;
public TikaExcelGeneralFormat(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);
}
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 > 1E15 || (abs <= 1E-15 && abs > 0)) {
return scientificFormat.format(number, toAppendTo, pos);
} else if (Math.floor(value) == value || abs > 1E15) {
// integer, or integer portion uses all 15 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_15_SF).doubleValue();
return decimalFormat.format(rounded, toAppendTo, pos);
}
public Object parseObject(String source, ParsePosition pos) {
throw new UnsupportedOperationException();
}
}