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Minimal DNS library for java and android systems

There is a newer version: 0.2.4

/*
 * Copyright 2015-2016 the original author or authors
 *
 * This software is licensed under the Apache License, Version 2.0,
 * the GNU Lesser General Public License version 2 or later ("LGPL")
 * and the WTFPL.
 * You may choose either license to govern your use of this software only
 * upon the condition that you accept all of the terms of either
 * the Apache License 2.0, the LGPL 2.1+ or the WTFPL.
 */
package de.measite.minidns.util;

import java.net.Inet4Address;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.UnknownHostException;

public class InetAddressUtil {

    public static Inet4Address ipv4From(CharSequence cs) {
        InetAddress inetAddress;
        try {
            inetAddress = InetAddress.getByName(cs.toString());
        } catch (UnknownHostException e) {
            throw new IllegalArgumentException(e);
        }
        if (inetAddress instanceof Inet4Address) {
            return (Inet4Address) inetAddress;
        }
        throw new IllegalArgumentException();
    }

    public static Inet6Address ipv6From(CharSequence cs) {
        InetAddress inetAddress;
        try {
            inetAddress = InetAddress.getByName(cs.toString());
        } catch (UnknownHostException e) {
            throw new IllegalArgumentException(e);
        }
        if (inetAddress instanceof Inet6Address) {
            return (Inet6Address) inetAddress;
        }
        throw new IllegalArgumentException();
    }
}