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/**
* Copyright (C) 2011-2015 The XDocReport Team
*
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package fr.opensagres.poi.xwpf.converter.core.utils;
/**
* 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 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;
}
}
/**
* 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 final String getString(int index) {
StringBuffer buf = new StringBuffer();
// 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 - (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);
// 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 final 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 final 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 final String getString(int index, boolean lowercase) {
if (lowercase) {
return getLowerCaseString(index);
}
else {
return getUpperCaseString(index);
}
}
/**
* Test this class using this main method.
*/
public static void main(String[] args) {
for (int i = 1; i < 2000; i++) {
System.out.println(getString(i));
}
}
}
