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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(); } }





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