001/*
002 * $Id: GreekAlphabetFactory.java 4847 2011-05-05 19:46:13Z redlab_b $
003 *
004 * This file is part of the iText (R) project.
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006 * Authors: Bruno Lowagie, Paulo Soares, et al.
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044package com.itextpdf.text.factories;
045
046import com.itextpdf.text.SpecialSymbol;
047
048/**
049 * This class can produce String combinations representing a number built with
050 * Greek letters (from alpha to omega, then alpha alpha, alpha beta, alpha gamma).
051 * We are aware of the fact that the original Greek numbering is different;
052 * See http://www.cogsci.indiana.edu/farg/harry/lan/grknum.htm#ancient
053 * but this isn't implemented yet; the main reason being the fact that we
054 * need a font that has the obsolete Greek characters qoppa and sampi.
055 *
056 * @since 2.0.7 (was called GreekNumberFactory in earlier versions)
057 */
058public class GreekAlphabetFactory {
059        /**
060         * Changes an int into a lower case Greek letter combination.
061         * @param index the original number
062         * @return the letter combination
063         */
064        public static final String getString(final int index) {
065                return getString(index, true);
066        }
067
068        /**
069         * Changes an int into a lower case Greek letter combination.
070         * @param index the original number
071         * @return the letter combination
072         */
073        public static final String getLowerCaseString(final int index) {
074                return getString(index);
075        }
076
077        /**
078         * Changes an int into a upper case Greek letter combination.
079         * @param index the original number
080         * @return the letter combination
081         */
082        public static final String getUpperCaseString(final int index) {
083                return getString(index).toUpperCase();
084        }
085
086        /**
087         * Changes an int into a Greek letter combination.
088         * @param index the original number
089         * @param lowercase set to lowercase
090         * @return the letter combination
091         */
092        public static final String getString(int index, final boolean lowercase) {
093                if (index < 1) return "";
094            index--;
095
096            int bytes = 1;
097            int start = 0;
098            int symbols = 24;
099                while(index >= symbols + start) {
100                        bytes++;
101                    start += symbols;
102                        symbols *= 24;
103                }
104
105                int c = index - start;
106                char[] value = new char[bytes];
107                while(bytes > 0) {
108                        bytes--;
109                        value[bytes] = (char)(c % 24);
110                        if (value[bytes] > 16) value[bytes]++;
111                        value[bytes] += (lowercase ? 945 : 913);
112                        value[bytes] = SpecialSymbol.getCorrespondingSymbol(value[bytes]);
113                        c /= 24;
114                }
115
116                return String.valueOf(value);
117        }
118}