/*
 * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/conn/util/InetAddressUtils.java $
 * $Revision: 652020 $
 * $Date: 2008-04-27 14:23:31 -0700 (Sun, 27 Apr 2008) $
 * 
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.http.conn.util;

import java.util.regex.Pattern;

/**
 * A collection of utilities relating to InetAddresses.
 */
public class InetAddressUtils {

    private InetAddressUtils() {
    }
    
    private static final Pattern IPV4_PATTERN = 
        Pattern.compile(
                "^(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)(\\.(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)){3}$");

    private static final Pattern IPV6_STD_PATTERN = 
        Pattern.compile(
                "^(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}$");

    private static final Pattern IPV6_HEX_COMPRESSED_PATTERN = 
        Pattern.compile(
                "^((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)::((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)$");

    public static boolean isIPv4Address(final String input) {
        return IPV4_PATTERN.matcher(input).matches();
    }

    public static boolean isIPv6StdAddress(final String input) {
        return IPV6_STD_PATTERN.matcher(input).matches();
    }
    
    public static boolean isIPv6HexCompressedAddress(final String input) {
        return IPV6_HEX_COMPRESSED_PATTERN.matcher(input).matches();
    }
    
    public static boolean isIPv6Address(final String input) {
        return isIPv6StdAddress(input) || isIPv6HexCompressedAddress(input); 
    }

}