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/*
 * TeleStax, Open Source Cloud Communications
 * Copyright 2011-2016, TeleStax Inc. and individual contributors
 * by the @authors tag.
 *
 * This program is free software: you can redistribute it and/or modify
 * under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see 
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 *   JBoss, Home of Professional Open Source
 *   Copyright 2007-2011, Red Hat, Inc. and individual contributors
 *   by the @authors tag. See the copyright.txt in the distribution for a
 *   full listing of individual contributors.
 *
 *   This 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 2.1 of
 *   the License, or (at your option) any later version.
 *
 *   This software 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
 *   Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public
 *   License along with this software; if not, write to the Free
 *   Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 *   02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.jdiameter.client.impl.helpers;

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.StringTokenizer;

/**
 * This class allows to convert string to IPv4/IPv6 object instance
 *
 * @author [email protected]
 * @author  Alexandre Mendonca 
 * @author  Bartosz Baranowski 
 */
@SuppressWarnings("all") //3rd party lib
public class IPConverter {

    /**
     * Convert defined string to IPv4 object instance
     *
     * @param address string representation of ip address
     *
     * @return IPv4 object instance
     */
    public static InetAddress InetAddressByIPv4(String address) {
        StringTokenizer addressTokens = new StringTokenizer(address, ".");
        byte[] bytes;
        if (addressTokens.countTokens() == 4) {
            bytes = new byte[] {
                    getByBytes(addressTokens),
                    getByBytes(addressTokens),
                    getByBytes(addressTokens),
                    getByBytes(addressTokens)
            };
        } else {
            return null;
        }

        try {
            return InetAddress.getByAddress(bytes);
        } catch (UnknownHostException e) {
            return null;
        }
    }

    private static byte getByBytes(StringTokenizer addressTokens) {
        int word = Integer.parseInt(addressTokens.nextToken());
        return (byte) (word & 0xff);
    }

    /**
     * Convert defined string to IPv6 object instance
     *
     * @param address string representation of ip address
     *
     * @return IPv6 object instance
     */
    public static InetAddress InetAddressByIPv6(String address) {
        StringTokenizer addressTokens = new StringTokenizer(address, ":");
        byte[] bytes = new byte[16];
        if (addressTokens.countTokens() == 8) {
            int count = 0;
            while (addressTokens.hasMoreTokens()) {
                int word = Integer.parseInt(addressTokens.nextToken(), 16);
                bytes[count * 2] = (byte) ((word >> 8) & 0xff);
                bytes[count * 2 + 1] = (byte) (word & 0xff);
                count++;
            }
        } else {
            return null;
        }
        try {
            return InetAddress.getByAddress(bytes);
        } catch (UnknownHostException e) {
            return null;
        }
    }
}