Java IP Address Mash checkIpMaskPart(String part)

Description

check Ip Mask Part

License

Open Source License

Declaration

private static String checkIpMaskPart(String part) 

Method Source Code

//package com.java2s;
/*/*from w  w  w  .  j a  v  a 2  s.  c  o  m*/
 * ============================================================================
 * GNU General Public License
 * ============================================================================
 *
 * Copyright (C) 2015 Infinite Automation Software. 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 * When signing a commercial license with Infinite Automation Software,
 * the following extension to GPL is made. A special exception to the GPL is
 * included to allow you to distribute a combined work that includes BAcnet4J
 * without being obliged to provide the source code for any proprietary components.
 *
 * See www.infiniteautomation.com for commercial license options.
 * 
 * @author Matthew Lohbihler
 */

public class Main {
    private static String checkIpMaskPart(String part) {
        if ("*".equals(part))
            return null;

        int dash = part.indexOf('-');
        try {
            if (dash == -1) {
                int value = Integer.parseInt(part);
                if (value < 0 || value > 255)
                    return "Value out of range in '" + part + "'";
            } else {
                int from = Integer.parseInt(part.substring(0, dash));
                if (from < 0 || from > 255)
                    return "'From' value out of range in '" + part + "'";

                int to = Integer.parseInt(part.substring(dash + 1));
                if (to < 0 || to > 255)
                    return "'To' value out of range in '" + part + "'";

                if (from > to)
                    return "'From' value is greater than 'To' value in '"
                            + part + "'";
            }
        } catch (NumberFormatException e) {
            return "Integer parsing error in '" + part + "'";
        }

        return null;
    }
}

Related

1. checkIpMask(String ip)
2. checkIpMaskPart(String part)