com.itextpdf.kernel.numbering.EnglishAlphabetNumbering Maven / Gradle / Ivy
/*
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
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following permission added to Section 15 as permitted in Section 7(a):
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or FITNESS FOR A PARTICULAR PURPOSE.
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*/
package com.itextpdf.kernel.numbering;
/**
* This class is responsible for converting integer numbers to their
* English alphabet letter representations.
*/
public class EnglishAlphabetNumbering {
protected static final char[] ALPHABET_LOWERCASE;
protected static final char[] ALPHABET_UPPERCASE;
protected static final int ALPHABET_LENGTH = 26;
static {
ALPHABET_LOWERCASE = new char[ALPHABET_LENGTH];
ALPHABET_UPPERCASE = new char[ALPHABET_LENGTH];
for (int i = 0; i < ALPHABET_LENGTH; i++) {
ALPHABET_LOWERCASE[i] = (char) ('a' + i);
ALPHABET_UPPERCASE[i] = (char) ('A' + i);
}
}
/**
* Converts the given number to its English alphabet lowercase string representation.
* E.g. 1 will be converted to "a", 2 to "b", ..., 27 to "aa", and so on.
*
* @param number the number greater than zero to be converted
* @return English alphabet lowercase string representation of an integer
*/
public static String toLatinAlphabetNumberLowerCase(int number) {
return AlphabetNumbering.toAlphabetNumber(number, ALPHABET_LOWERCASE);
}
/**
* Converts the given number to its English alphabet uppercase string representation.
* E.g. 1 will be converted to "A", 2 to "B", ..., 27 to "AA", and so on.
*
* @param number the number greater than zero to be converted
* @return English alphabet uppercase string representation of an integer
*/
public static String toLatinAlphabetNumberUpperCase(int number) {
return AlphabetNumbering.toAlphabetNumber(number, ALPHABET_UPPERCASE);
}
/**
* Converts the given number to its English alphabet string representation.
* E.g. for upperCase set to false,
* 1 will be converted to "a", 2 to "b", ..., 27 to "aa", and so on.
*
* @param number the number greater than zero to be converted
* @param upperCase whether to use uppercase or lowercase alphabet
* @return English alphabet string representation of an integer
*/
public static String toLatinAlphabetNumber(int number, boolean upperCase) {
return upperCase ? toLatinAlphabetNumberUpperCase(number) : toLatinAlphabetNumberLowerCase(number);
}
}