Java Socket Address Get get2428InetSocketAddress(String arg)

Description

Get the (RFC2428) InetSocketAddress corresponding to the FTP format of address (RFC2428)

License

Open Source License

Parameter

Parameter	Description
arg	a parameter

Return

the InetSocketAddress or null if an error occurs

Declaration

public static InetSocketAddress get2428InetSocketAddress(String arg) 

Method Source Code

//package com.java2s;
/**/*from   w  w  w.  java 2s  . co m*/
 * This file is part of Waarp Project.
 * 
 * Copyright 2009, Frederic Bregier, and individual contributors by the @author tags. See the
 * COPYRIGHT.txt in the distribution for a full listing of individual contributors.
 * 
 * All Waarp Project 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.
 * 
 * Waarp 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 Waarp . If not, see
 * <http://www.gnu.org/licenses/>.
 */

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;

public class Main {
    /**
     * Get the (RFC2428) InetSocketAddress corresponding to the FTP format of address (RFC2428)
     * 
     * @param arg
     * @return the InetSocketAddress or null if an error occurs
     */
    public static InetSocketAddress get2428InetSocketAddress(String arg) {
        // Format: #a#net-addr#tcp-port# where a = 1 IPV4 or 2 IPV6, other will
        // not be supported
        if (arg == null || arg.length() == 0) {
            // bad args
            return null;
        }
        String delim = arg.substring(0, 1);
        String[] infos = arg.split(delim);
        if (infos.length != 3) {
            // bad format
            return null;
        }
        boolean isIPV4 = true;
        if (infos[0].equals("1")) {
            isIPV4 = true;
        } else if (infos[0].equals("2")) {
            isIPV4 = false;
        } else {
            // not supported
            return null;
        }
        byte[] address = null;
        if (isIPV4) {
            // IPV4
            address = new byte[4];
            String[] elements = infos[1].split(".");
            if (elements.length != 4) {
                return null;
            }
            for (int i = 0; i < 4; i++) {
                try {
                    address[i] = (byte) Integer.parseInt(elements[i]);
                } catch (NumberFormatException e) {
                    return null;
                }
            }
        } else {
            // IPV6
            address = new byte[16];
            int[] value = new int[8];
            String[] elements = infos[1].split(":");
            if (elements.length != 8) {
                return null;
            }
            for (int i = 0, j = 0; i < 8; i++) {
                if (elements[i] == null || elements[i].length() == 0) {
                    value[i] = 0;
                } else {
                    try {
                        value[i] = Integer.parseInt(elements[i]);
                    } catch (NumberFormatException e) {
                        return null;
                    }
                }
                address[j++] = (byte) (value[i] >> 8);
                address[j++] = (byte) (value[i] & 0xFF);
            }
        }
        int port = 0;
        try {
            port = Integer.parseInt(infos[2]);
        } catch (NumberFormatException e) {
            return null;
        }
        InetAddress inetAddress;
        try {
            inetAddress = InetAddress.getByAddress(address);
        } catch (UnknownHostException e) {
            return null;
        }
        return new InetSocketAddress(inetAddress, port);
    }
}

Related

1. format(final SocketAddress s, final int defaultPort)
2. formatInetAddr(InetSocketAddress addr)
3. formatSocketAddress(final InetSocketAddress inetSocketAddress)
4. formatSocketAddress(SocketAddress address)
5. get2428Address(InetSocketAddress address)
6. get_IP_from_SocketAddress(String addr)
7. getAddress(InetSocketAddress address)
8. getAddress(InetSocketAddress address)
9. getAddress(SocketAddress address)