content: package net.majorkernelpanic.spydroid;
  
  /**
   * 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.net.InetAddress;
  import java.net.NetworkInterface;
  import java.net.SocketException;
  import java.util.Enumeration;
  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();
  	}
  
  	public static boolean isIpv4Address(String ipAddress) {
  		Matcher m1 = Utilities.VALID_IPV4_PATTERN.matcher(ipAddress);
  		return m1.matches();
  	}
  
  	public static boolean isIpv6Address(String ipAddress) {
  		Matcher m1 = Utilities.VALID_IPV6_PATTERN.matcher(ipAddress);
  		return m1.matches();
  	}
  
  
  	/**
  	 * Returns the IP address of the first configured interface of the device
  	 * @param removeIPv6 If true, IPv6 addresses are ignored
  	 * @return the IP address of the first configured interface or null
  	 */
  	public static String getLocalIpAddress(boolean removeIPv6) {
  		try {
  			for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
  				NetworkInterface intf = en.nextElement();
  				for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
  					InetAddress inetAddress = enumIpAddr.nextElement();
  					if (inetAddress.isSiteLocalAddress() &&
  							!inetAddress.isAnyLocalAddress() &&
  							(!removeIPv6 || isIpv4Address(inetAddress.getHostAddress().toString())) ) {
  						return inetAddress.getHostAddress().toString();
  					}
  				}
  			}
  		} catch (SocketException ignore) {}
  		return null;
  	}
  
  
  }