IPAddress.java Source code

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Here is the source code for IPAddress.java

Source

/*
 * Copyright (C) 2006-2008 Alfresco Software Limited.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
    
 * As a special exception to the terms and conditions of version 2.0 of 
 * the GPL, you may redistribute this Program in connection with Free/Libre 
 * and Open Source Software ("FLOSS") applications as described in Alfresco's 
 * FLOSS exception.  You should have recieved a copy of the text describing 
 * the FLOSS exception, and it is also available here: 
 * http://www.alfresco.com/legal/licensing"
 */

//package net.gqu.utils;

import java.util.StringTokenizer;

/**
 * TCP/IP Address Utility Class
 *
 * @author gkspencer
 */
public class IPAddress {

    /**
     * Check if the specified address is a valid numeric TCP/IP address
     * 
     * @param ipaddr String
     * @return boolean
     */
    public final static boolean isNumericAddress(String ipaddr) {

        //   Check if the string is valid

        if (ipaddr == null || ipaddr.length() < 7 || ipaddr.length() > 15)
            return false;

        //   Check the address string, should be n.n.n.n format

        StringTokenizer token = new StringTokenizer(ipaddr, ".");
        if (token.countTokens() != 4)
            return false;

        while (token.hasMoreTokens()) {

            //   Get the current token and convert to an integer value

            String ipNum = token.nextToken();

            try {
                int ipVal = Integer.valueOf(ipNum).intValue();
                if (ipVal < 0 || ipVal > 255)
                    return false;
            } catch (NumberFormatException ex) {
                return false;
            }
        }

        //   Looks like a valid IP address

        return true;
    }

}