mirror of
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243 lines
7.7 KiB
Java
243 lines
7.7 KiB
Java
/*
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* Copyright 2003-2004, Franz-Josef Elmer, All rights reserved
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details
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* (http://www.gnu.org/copyleft/lesser.html).
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package jcckit.util;
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/**
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*
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*
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* @author Franz-Josef Elmer
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*/
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class FormatElement {
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/** All descriptor characters. */
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static final String DESCRIPTORS = "doxfeEgG";
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private static final String INT_DESCRIPTORS = "dox";
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private static final int INT_DESCRIPTOR = 0;
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private static final int FLOAT_DESCRIPTOR = 1;
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/**
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* Calculate the integer power of a floating point number.
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* @param n Exponent.
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* @param x Number.
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* @return <tt>x^n</tt>.
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*/
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private static final double power(double x, int n) {
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return n < 0 ? 1.0 / power2(x, -n) : power2(x, n);
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}
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/** Calculate <tt>x^n</tt> recursively assuming <tt>n > 0</tt>. */
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private static final double power2(double x, int n) {
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switch (n) {
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case 0: return 1;
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case 1: return x;
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default:
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double p = power2(x, n / 2);
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return p * p * power2(x, n % 2);
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}
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}
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private final char _descriptor;
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private final int _descriptorType;
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private final double _tenToPrecision;
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private boolean _decimalPoint;
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private boolean _flushLeft;
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private boolean _leadingZeros;
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private boolean _alwaysSign;
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private int _width;
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private int _precision;
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/** Creates an instance for the specified format string. */
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FormatElement(String formatString) {
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int len = formatString.length() - 1;
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_descriptor = formatString.charAt(len);
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if (DESCRIPTORS.indexOf(_descriptor) < 0) {
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throw new IllegalArgumentException("Format element '" + formatString
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+ "' does not ends with one of the following characters: "
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+ DESCRIPTORS);
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}
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_descriptorType = INT_DESCRIPTORS.indexOf(_descriptor) >= 0
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? INT_DESCRIPTOR : FLOAT_DESCRIPTOR;
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if (formatString.length() > 1) {
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switch (formatString.charAt(0)) {
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case '-':
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_flushLeft = true;
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formatString = formatString.substring(1);
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break;
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case '0':
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_leadingZeros = true;
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formatString = formatString.substring(1);
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break;
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case '+':
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_alwaysSign = true;
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formatString = formatString.substring(1);
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break;
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}
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len = formatString.length() - 1;
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int index = formatString.indexOf('.');
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_decimalPoint = index >= 0;
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int last = _decimalPoint ? index : len;
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if (last > 0) {
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_width = Integer.parseInt(formatString.substring(0, last));
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}
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if (_decimalPoint) {
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index++;
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if (index < len) {
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_precision = Integer.parseInt(formatString.substring(index, len));
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}
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}
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}
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_tenToPrecision = power(10, _precision);
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}
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/**
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* Format a number in accordance of the format string
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* given at the initialisation of this instance.
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* @param buffer Buffer to which the formated output will be appended.
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* @param number Number to be formated.
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*/
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public void form(StringBuffer buffer, long number) {
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if (_descriptorType == FLOAT_DESCRIPTOR) {
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form(buffer, (double) number);
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} else {
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// Format absolut value in the right base
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buffer.append(form(number < 0,
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Long.toString(Math.abs(number),
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_descriptor == 'o' ? 8
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: (_descriptor == 'x' ? 16 : 10)),
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""));
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}
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}
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/**
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* Format a number in accordance of the format string
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* given at the initialisation of this instance.
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* @param buffer Buffer to which the formated output will be appended.
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* @param number Number to be formated.
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*/
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public void form(StringBuffer buffer, double number) {
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if (_descriptorType == INT_DESCRIPTOR) {
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form(buffer, (long) Math.floor(number + 0.5));
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} else if (_descriptor == 'f') {
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buffer.append(formF(number));
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} else if (_descriptor == 'e' || _descriptor == 'E') {
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buffer.append(formE(number));
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} else if (_descriptor == 'g' || _descriptor == 'G') {
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String formF = formF(number);
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String formE = formE(number);
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buffer.append(formF.length() > formE.length() ? formE : formF);
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}
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}
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private String form(boolean negativeValue, String intPart, String fracPart) {
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int len = intPart.length() + fracPart.length();
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// Buffer holding the result
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StringBuffer result = new StringBuffer();
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int count = 0;
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// add sign if necessary
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if (_alwaysSign || negativeValue) {
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result.append(negativeValue ? '-' : '+');
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count++;
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}
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// add zeros if necessary
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if (_leadingZeros) {
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for (int i = count + len; i < _width; i++) {
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result.append('0');
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count++;
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}
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}
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// add number
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result.append(intPart).append(fracPart);
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count += len;
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// add spaces if necessary
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if (_flushLeft) {
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for (; count < _width; count++) {
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result.append(' ');
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}
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} else {
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for (; count < _width; count++) {
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result.insert(0, ' ');
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}
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}
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return new String(result);
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}
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/** Format floating point number with exponent. */
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private String formE(double number) {
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// format absolute mantisse
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int exponent = 0;
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String zeros = "00000000000000000000000".substring(0, _precision + 1);
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if (number != 0) {
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exponent = (int) Math.floor(Math.log(Math.abs(number)) / Math.log(10));
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double mantisse = Math.floor(Math.abs(number * power(10.0,
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_precision - exponent)) + 0.5);
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if (mantisse >= 10 * _tenToPrecision) {
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exponent++;
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mantisse = Math.floor(Math.abs(number * power(10.0,
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_precision - exponent)) + 0.5);
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}
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zeros = Long.toString((long) mantisse);
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}
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// make fractional part
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StringBuffer fracPart = new StringBuffer();
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if (_decimalPoint) {
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fracPart.append('.').append(zeros.substring(1));
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}
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// make exponent
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fracPart.append(Character.isLowerCase(_descriptor) ? 'e': 'E')
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.append(exponent < 0 ? '-' : '+');
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exponent = Math.abs(exponent);
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for (int i = 0, n = fracPart.length(); i < 3; i++) {
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fracPart.insert(n, Character.forDigit(exponent % 10, 10));
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exponent /= 10;
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}
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return form(number < 0, zeros.substring(0, 1), new String(fracPart));
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}
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/** Format floating point number. */
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private String formF(double number) {
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// Format absolut value
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double multiplier = number < 0 ? - _tenToPrecision : _tenToPrecision;
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String digits
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= Long.toString((long) Math.floor(number * multiplier + 0.5));
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String intPart = digits;
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StringBuffer fracPart = new StringBuffer();
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if (_decimalPoint) {
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int len = digits.length() - _precision;
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fracPart.append('.').append(digits.substring(Math.max(0, len)));
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if (len > 0) {
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intPart = digits.substring(0, len);
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} else {
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intPart = "0";
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for (; len < 0; len++) {
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fracPart.insert(1, '0');
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}
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}
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}
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return form(number < 0, intPart, new String(fracPart));
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}
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}
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