Utilities.java Source code

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Here is the source code for Utilities.java

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/**
 * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE, version 2.1, dated February 1999.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the latest version of the GNU Lesser General
 * Public License as published by the Free Software Foundation;
 *
 * 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program (LICENSE.txt); if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
//package org.jamwiki.utils;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.net.URL;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.text.MessageFormat;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.ResourceBundle;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

/**
 * This class provides a variety of basic utility methods that are not
 * dependent on any other classes within the org.jamwiki package structure.
 */
public class Utilities {
    private static Pattern VALID_IPV4_PATTERN = null;
    private static Pattern VALID_IPV6_PATTERN = null;
    private static final String ipv4Pattern = "(([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.){3}([01]?\\d\\d?|2[0-4]\\d|25[0-5])";
    private static final String ipv6Pattern = "([0-9a-f]{1,4}:){7}([0-9a-f]){1,4}";

    static {
        try {
            VALID_IPV4_PATTERN = Pattern.compile(ipv4Pattern, Pattern.CASE_INSENSITIVE);
            VALID_IPV6_PATTERN = Pattern.compile(ipv6Pattern, Pattern.CASE_INSENSITIVE);
        } catch (PatternSyntaxException e) {
            //logger.severe("Unable to compile pattern", e);
        }
    }

    /**
     * Determine if the given string is a valid IPv4 or IPv6 address.  This method
     * uses pattern matching to see if the given string could be a valid IP address.
     *
     * @param ipAddress A string that is to be examined to verify whether or not
     *  it could be a valid IP address.
     * @return <code>true</code> if the string is a value that is a valid IP address,
     *  <code>false</code> otherwise.
     */
    public static boolean isIpAddress(String ipAddress) {

        Matcher m1 = Utilities.VALID_IPV4_PATTERN.matcher(ipAddress);
        if (m1.matches()) {
            return true;
        }
        Matcher m2 = Utilities.VALID_IPV6_PATTERN.matcher(ipAddress);
        return m2.matches();
    }

}