Java IP Address Validate isIPv4LiteralAddress(String src)

Description

is I Pv Literal Address

License

Open Source License

Parameter

Parameter	Description
src	a String representing an IPv4 address in textual format

Return

a boolean indicating whether src is an IPv4 literal address

Declaration

public static boolean isIPv4LiteralAddress(String src) 

Method Source Code

//package com.java2s;
/*/*from   www . j a  v a  2s .  com*/
 * #%L
 * Xacml4J Core Engine Implementation
 * %%
 * Copyright (C) 2009 - 2014 Xacml4J.org
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser 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 Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/lgpl-3.0.html>.
 * #L%
 */

import java.util.regex.Pattern;

public class Main {
    private final static int INADDR4SZ = 4;
    private static final Pattern DOT_PATTERN = Pattern.compile("\\.");

    /**
     * @param src a String representing an IPv4 address in textual format
     * @return a boolean indicating whether src is an IPv4 literal address
     */
    public static boolean isIPv4LiteralAddress(String src) {
        return textToNumericFormatV4(src) != null;
    }

    public static byte[] textToNumericFormatV4(String src) {
        if (src.length() == 0) {
            return null;
        }

        byte[] res = new byte[INADDR4SZ];
        String[] s = DOT_PATTERN.split(src, -1);
        long val;
        try {
            switch (s.length) {
            case 1:
                /*
                 * When only one part is given, the value is stored directly in
                 * the network address without any byte rearrangement.
                 */

                val = Long.parseLong(s[0]);
                if (val < 0 || val > 0xffffffffL)
                    return null;
                res[0] = (byte) ((val >> 24) & 0xff);
                res[1] = (byte) (((val & 0xffffff) >> 16) & 0xff);
                res[2] = (byte) (((val & 0xffff) >> 8) & 0xff);
                res[3] = (byte) (val & 0xff);
                break;
            case 2:
                /*
                 * When a two part address is supplied, the last part is
                 * interpreted as a 24-bit quantity and placed in the right
                 * most three bytes of the network address. This makes the
                 * two part address format convenient for specifying Class A
                 * network addresses as net.host.
                 */

                val = Integer.parseInt(s[0]);
                if (val < 0 || val > 0xff)
                    return null;
                res[0] = (byte) (val & 0xff);
                val = Integer.parseInt(s[1]);
                if (val < 0 || val > 0xffffff)
                    return null;
                res[1] = (byte) ((val >> 16) & 0xff);
                res[2] = (byte) (((val & 0xffff) >> 8) & 0xff);
                res[3] = (byte) (val & 0xff);
                break;
            case 3:
                /*
                 * When a three part address is specified, the last part is
                 * interpreted as a 16-bit quantity and placed in the right
                 * most two bytes of the network address. This makes the
                 * three part address format convenient for specifying
                 * Class B net- work addresses as 128.net.host.
                 */
                for (int i = 0; i < 2; i++) {
                    val = Integer.parseInt(s[i]);
                    if (val < 0 || val > 0xff)
                        return null;
                    res[i] = (byte) (val & 0xff);
                }
                val = Integer.parseInt(s[2]);
                if (val < 0 || val > 0xffff)
                    return null;
                res[2] = (byte) ((val >> 8) & 0xff);
                res[3] = (byte) (val & 0xff);
                break;
            case 4:
                /*
                 * When four parts are specified, each is interpreted as a
                 * byte of data and assigned, from left to right, to the
                 * four bytes of an IPv4 address.
                 */
                for (int i = 0; i < 4; i++) {
                    val = Integer.parseInt(s[i]);
                    if (val < 0 || val > 0xff)
                        return null;
                    res[i] = (byte) (val & 0xff);
                }
                break;
            default:
                return null;
            }
        } catch (NumberFormatException e) {
            return null;
        }
        return res;
    }
}

Related

1. isIPv4Address(String ipAddress)
2. isIPv4AddressValid(String cidr)
3. isIpv4Correct(String ipAddress)
4. isIPv4Format(String ip)
5. isIPv4Format(String str)
6. isIPv4LiteralAddress(String string)
7. isIpV4PortAddress(String s)
8. isIpV4StrValid(String str)
9. isIPv6(final String ip)