001/* 002 * $Id: RomanAlphabetFactory.java 4847 2011-05-05 19:46:13Z redlab_b $ 003 * 004 * This file is part of the iText (R) project. 005 * Copyright (c) 1998-2011 1T3XT BVBA 006 * Authors: Bruno Lowagie, Paulo Soares, et al. 007 * 008 * This program is free software; you can redistribute it and/or modify 009 * it under the terms of the GNU Affero General Public License version 3 010 * as published by the Free Software Foundation with the addition of the 011 * following permission added to Section 15 as permitted in Section 7(a): 012 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT, 013 * 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS. 014 * 015 * This program is distributed in the hope that it will be useful, but 016 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 017 * or FITNESS FOR A PARTICULAR PURPOSE. 018 * See the GNU Affero General Public License for more details. 019 * You should have received a copy of the GNU Affero General Public License 020 * along with this program; if not, see http://www.gnu.org/licenses or write to 021 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 022 * Boston, MA, 02110-1301 USA, or download the license from the following URL: 023 * http://itextpdf.com/terms-of-use/ 024 * 025 * The interactive user interfaces in modified source and object code versions 026 * of this program must display Appropriate Legal Notices, as required under 027 * Section 5 of the GNU Affero General Public License. 028 * 029 * In accordance with Section 7(b) of the GNU Affero General Public License, 030 * a covered work must retain the producer line in every PDF that is created 031 * or manipulated using iText. 032 * 033 * You can be released from the requirements of the license by purchasing 034 * a commercial license. Buying such a license is mandatory as soon as you 035 * develop commercial activities involving the iText software without 036 * disclosing the source code of your own applications. 037 * These activities include: offering paid services to customers as an ASP, 038 * serving PDFs on the fly in a web application, shipping iText with a closed 039 * source product. 040 * 041 * For more information, please contact iText Software Corp. at this 042 * address: sales@itextpdf.com 043 */ 044package com.itextpdf.text.factories; 045 046import com.itextpdf.text.error_messages.MessageLocalization; 047 048/** 049 * This class can produce String combinations representing a number. 050 * "a" to "z" represent 1 to 26, "AA" represents 27, "AB" represents 28, 051 * and so on; "ZZ" is followed by "AAA". 052 */ 053public class RomanAlphabetFactory { 054 055 /** 056 * Translates a positive integer (not equal to zero) 057 * into a String using the letters 'a' to 'z'; 058 * 1 = a, 2 = b, ..., 26 = z, 27 = aa, 28 = ab,... 059 * @param index the index 060 * @return a translated string 061 */ 062 public static final String getString(int index) { 063 if (index < 1) throw new NumberFormatException(MessageLocalization.getComposedMessage("you.can.t.translate.a.negative.number.into.an.alphabetical.value")); 064 065 index--; 066 int bytes = 1; 067 int start = 0; 068 int symbols = 26; 069 while(index >= symbols + start) { 070 bytes++; 071 start += symbols; 072 symbols *= 26; 073 } 074 075 int c = index - start; 076 char[] value = new char[bytes]; 077 while(bytes > 0) { 078 value[--bytes] = (char)( 'a' + (c % 26)); 079 c /= 26; 080 } 081 082 return new String(value); 083 } 084 085 /** 086 * Translates a positive integer (not equal to zero) 087 * into a String using the letters 'a' to 'z'; 088 * 1 = a, 2 = b, ..., 26 = z, 27 = aa, 28 = ab,... 089 * @param index the int to translate 090 * @return the string in lowercase 091 */ 092 public static final String getLowerCaseString(final int index) { 093 return getString(index); 094 } 095 096 /** 097 * Translates a positive integer (not equal to zero) 098 * into a String using the letters 'A' to 'Z'; 099 * 1 = A, 2 = B, ..., 26 = Z, 27 = AA, 28 = AB,... 100 * @param index the int to translate 101 * @return the string in uppercase 102 */ 103 public static final String getUpperCaseString(final int index) { 104 return getString(index).toUpperCase(); 105 } 106 107 108 /** 109 * Translates a positive integer (not equal to zero) 110 * into a String using the letters 'a' to 'z' 111 * (a = 1, b = 2, ..., z = 26, aa = 27, ab = 28,...). 112 * @param index the int to translate 113 * @param lowercase true if the string sshould be lowercase false otherwise 114 * @return the translated string 115 */ 116 public static final String getString(final int index, final boolean lowercase) { 117 if (lowercase) { 118 return getLowerCaseString(index); 119 } 120 else { 121 return getUpperCaseString(index); 122 } 123 } 124}