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/*
This file is part of the iText (R) project.
Copyright (c) 1998-2022 iText Group NV
Authors: Bruno Lowagie, Paulo Soares, et al.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License version 3
as published by the Free Software Foundation with the addition of the
following permission added to Section 15 as permitted in Section 7(a):
FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
OF THIRD PARTY RIGHTS
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program; if not, see http://www.gnu.org/licenses or write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA, 02110-1301 USA, or download the license from the following URL:
http://itextpdf.com/terms-of-use/
The interactive user interfaces in modified source and object code versions
of this program must display Appropriate Legal Notices, as required under
Section 5 of the GNU Affero General Public License.
In accordance with Section 7(b) of the GNU Affero General Public License,
a covered work must retain the producer line in every PDF that is created
or manipulated using iText.
You can be released from the requirements of the license by purchasing
a commercial license. Buying such a license is mandatory as soon as you
develop commercial activities involving the iText software without
disclosing the source code of your own applications.
These activities include: offering paid services to customers as an ASP,
serving PDFs on the fly in a web application, shipping iText with a closed
source product.
For more information, please contact iText Software Corp. at this
address: [email protected]
*/
package com.itextpdf.kernel.numbering;
/**
* This class can produce String combinations representing a roman number.
* The first roman numbers are: I, II, III, IV, V, VI, VII, VIII, IX, X
* See http://en.wikipedia.org/wiki/Roman_numerals
*/
public class RomanNumbering {
/**
* Array with Roman digits.
*/
private static final RomanDigit[] ROMAN_DIGITS = {
new RomanDigit('m', 1000, false),
new RomanDigit('d', 500, false),
new RomanDigit('c', 100, true),
new RomanDigit('l', 50, false),
new RomanDigit('x', 10, true),
new RomanDigit('v', 5, false),
new RomanDigit('i', 1, true)
};
/**
* Returns a lower case roman representation of an integer.
*
* @param number a number to be converted to roman notation
* @return a lower case roman representation of an integer
*/
public static String toRomanLowerCase(int number) {
return convert(number);
}
/**
* Returns an upper case roman representation of an integer.
*
* @param number a number to be converted to roman notation
* @return an upper case roman representation of an integer
*/
public static String toRomanUpperCase(int number) {
return convert(number).toUpperCase();
}
/**
* Returns a roman representation of an integer.
*
* @param number a number to be converted to roman notation
* @param upperCase true for upper case representation,
* false for lower case one
* @return a roman representation of an integer
*/
public static String toRoman(int number, boolean upperCase) {
return upperCase ? toRomanUpperCase(number) : toRomanLowerCase(number);
}
/**
* Returns a roman representation of an integer.
*
* @param index the original number
* @return the roman number representation (lower case)
*/
protected static String convert(int index) {
StringBuilder buf = new StringBuilder();
// lower than 0 ? Add minus
if (index < 0) {
buf.append('-');
index = -index;
}
if (index >= 4000) {
buf.append('|');
buf.append(convert(index / 1000));
buf.append('|');
// remainder
index = index - (index / 1000) * 1000;
}
// number between 1 and 3999
int pos = 0;
while (true) {
// loop over the array with values for m-d-c-l-x-v-i
RomanDigit dig = ROMAN_DIGITS[pos];
// adding as many digits as we can
while (index >= dig.value) {
buf.append(dig.digit);
index -= dig.value;
}
// we have the complete number
if (index <= 0) {
break;
}
// look for the next digit that can be used in a special way
int j = pos;
while (!ROMAN_DIGITS[++j].pre) ;
// does the special notation apply?
if (index + ROMAN_DIGITS[j].value >= dig.value) {
buf.append(ROMAN_DIGITS[j].digit).append(dig.digit);
index -= dig.value - ROMAN_DIGITS[j].value;
}
pos++;
}
return buf.toString();
}
/**
* Helper class for Roman Digits
*/
private static class RomanDigit {
/**
* part of a roman number
*/
public char digit;
/**
* value of the roman digit
*/
public int value;
/**
* can the digit be used as a prefix
*/
public boolean pre;
/**
* Constructs a roman digit
*
* @param digit the roman digit
* @param value the value
* @param pre can it be used as a prefix
*/
RomanDigit(char digit, int value, boolean pre) {
this.digit = digit;
this.value = value;
this.pre = pre;
}
}
}
