Checks whether the parameter is a valid IPv6 address (including compressed). - Java Network

Java examples for Network:IP Address

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Description

Checks whether the parameter is a valid IPv6 address (including compressed).

Demo Code

/**//w w  w.  j  a  v a2 s . co m
 * 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.
 */
//package com.java2s;
import java.util.regex.Pattern;

public class Main {
    public static void main(String[] argv) throws Exception {
        String input = "java2s.com";
        System.out.println(isIPv6Address(input));
    }

    private static final Pattern IPV6_STD_PATTERN = Pattern
            .compile("^[0-9a-fA-F]{1,4}(:[0-9a-fA-F]{1,4}){7}$");
    private static final Pattern IPV6_HEX_COMPRESSED_PATTERN = Pattern
            .compile("^(([0-9A-Fa-f]{1,4}(:[0-9A-Fa-f]{1,4}){0,5})?)" // 0-6 hex fields
                    + "::"
                    + "(([0-9A-Fa-f]{1,4}(:[0-9A-Fa-f]{1,4}){0,5})?)$");
    private static final char COLON_CHAR = ':';
    private static final int MAX_COLON_COUNT = 7;

    /**
     * Checks whether the parameter is a valid IPv6 address (including compressed).
     *
     * @param input the address string to check for validity
     * @return true if the input parameter is a valid standard or compressed IPv6 address
     */
    public static boolean isIPv6Address(final String input) {
        return isIPv6StdAddress(input) || isIPv6HexCompressedAddress(input);
    }

    /**
     * Checks whether the parameter is a valid standard (non-compressed) IPv6 address
     *
     * @param input the address string to check for validity
     * @return true if the input parameter is a valid standard (non-compressed) IPv6 address
     */
    public static boolean isIPv6StdAddress(final String input) {
        return IPV6_STD_PATTERN.matcher(input).matches();
    }

    /**
     * Checks whether the parameter is a valid compressed IPv6 address
     *
     * @param input the address string to check for validity
     * @return true if the input parameter is a valid compressed IPv6 address
     */
    public static boolean isIPv6HexCompressedAddress(final String input) {
        int colonCount = 0;
        for (int i = 0; i < input.length(); i++) {
            if (input.charAt(i) == COLON_CHAR) {
                colonCount++;
            }
        }
        return colonCount <= MAX_COLON_COUNT
                && IPV6_HEX_COMPRESSED_PATTERN.matcher(input).matches();
    }
}

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