Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Created on 7 Jun 2007
 * Created by Allan Crooks
 * Copyright (C) 2007 Aelitis, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program 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 General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * AELITIS, SAS au capital de 46,603.30 euros
 * 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
 */

public class Main {
    public static String getMainlineStyleVersionNumber(String peer_id) {
        boolean two_digit_in_middle = peer_id.charAt(5) == '-';
        String middle_part = decodeNumericChar(peer_id.charAt(3));
        if (two_digit_in_middle) {
            middle_part = join(middle_part, decodeNumericChar(peer_id.charAt(4)));
        }
        return joinAsDotted(decodeNumericChar(peer_id.charAt(1)), middle_part,
                decodeNumericChar(peer_id.charAt(two_digit_in_middle ? 6 : 5)));
    }

    public static String decodeNumericChar(char c) {
        String result = decodeAlphaNumericChar(c);
        if (result == null || result.length() == 1) {
            return result;
        }
        return null;
    }

    private static String join(String a, String b) {
        if (a == null) {
            return null;
        }
        if (b == null) {
            return null;
        }
        return a + b;
    }

    private static String joinAsDotted(String a, String b) {
        if (a == null) {
            return null;
        }
        if (b == null) {
            return null;
        }
        return a + "." + b;
    }

    private static String joinAsDotted(String a, String b, String c) {
        if (a == null) {
            return null;
        }
        if (b == null) {
            return null;
        }
        if (c == null) {
            return null;
        }
        return a + "." + b + "." + c;
    }

    public static String decodeAlphaNumericChar(char c) {
        if ('0' <= c && c <= '9') {
            return String.valueOf(c);
        } else if ('A' <= c && c <= 'Z') {
            return String.valueOf(10 + (c - 'A'));
        } else if ('a' <= c && c <= 'z') {
            return String.valueOf(36 + (c - 'A'));
        } else if (c == '.') {
            return "62";
        }
        return null;
    }
}