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RTF generation library derived from iText-2.1.7. All PDF features and RTF parsing are removed. Code is modernized for Java 8.
/*
* $Id: RomanNumberFactory.java 3373 2008-05-12 16:21:24Z xlv $
*
* Copyright 2007 by Bruno Lowagie.
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library 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 Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* https://github.com/osobolev/rtf-gen
*/
package com.lowagie.text.factories;
/**
* This class can produce String combinations representing a roman number.
*/
public class RomanNumberFactory {
/**
* Helper class for Roman Digits
*/
private static class RomanDigit {
/**
* part of a roman number
*/
public final char digit;
/**
* value of the roman digit
*/
public final int value;
/**
* can the digit be used as a prefix
*/
public final 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;
}
}
/**
* Array with Roman digits.
*/
private static final RomanDigit[] roman = {
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)
};
/**
* Changes an int into a lower case roman number.
*
* @param index the original number
* @return the roman number (lower case)
*/
public static String getString(int index) {
StringBuilder buf = new StringBuilder();
// lower than 0 ? Add minus
if (index < 0) {
buf.append('-');
index = -index;
}
// greater than 3000
if (index > 3000) {
buf.append('|');
buf.append(getString(index / 1000));
buf.append('|');
// remainder
index -= (index / 1000) * 1000;
}
// number between 1 and 3000
int pos = 0;
while (true) {
// loop over the array with values for m-d-c-l-x-v-i
RomanDigit dig = roman[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[++j].pre) {
// empty loop body
}
// does the special notation apply?
if (index + roman[j].value >= dig.value) {
buf.append(roman[j].digit).append(dig.digit);
index -= dig.value - roman[j].value;
}
pos++;
}
return buf.toString();
}
/**
* Changes an int into a lower case roman number.
*
* @param index the original number
* @return the roman number (lower case)
*/
public static String getLowerCaseString(int index) {
return getString(index);
}
/**
* Changes an int into an upper case roman number.
*
* @param index the original number
* @return the roman number (lower case)
*/
public static String getUpperCaseString(int index) {
return getString(index).toUpperCase();
}
/**
* Changes an int into a roman number.
*
* @param index the original number
* @return the roman number (lower case)
*/
public static String getString(int index, boolean lowercase) {
if (lowercase) {
return getLowerCaseString(index);
} else {
return getUpperCaseString(index);
}
}
}
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