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/*
 * MACAddressParserTest.java
 * 
 * Created 30.01.2006.
 * 
 * eaio: UUID - an implementation of the UUID specification
 * Copyright (c) 2003-2013 Johann Burkard ([email protected]) http://eaio.com.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
 * NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package com.almende.util.uuid;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * The MAC address parser attempts to find the following patterns:
 * 
 * .{1,2}:.{1,2}:.{1,2}:.{1,2}:.{1,2}:.{1,2}
 * .{1,2}-.{1,2}-.{1,2}-.{1,2}-.{1,2}-.{1,2}
 * 
 * 
 * @author Johann Burkard
 * @version MACAddressParser.java 4714 2012-03-16 11:43:28Z johann $
 * @see UUID
 */
public final class MACAddressParser {
	/** The Constant MAC_ADDRESS. */
	public static final Pattern	MAC_ADDRESS	= Pattern
													.compile(
															"((?:[A-F0-9]{1,2}[:-]){5}[A-F0-9]{1,2})|(?:0x)(\\d{12})(?:.+ETHER)",
															Pattern.CASE_INSENSITIVE);
	
	private MACAddressParser() {
	};
	
	/**
	 * Attempts to find a pattern in the given String.
	 * 
	 * @param in
	 *            the String, may not be null
	 * @return the substring that matches this pattern or null
	 */
	static String parse(final String in) {
		final Matcher m = MAC_ADDRESS.matcher(in);
		if (m.find()) {
			String g = m.group(2);
			if (g == null) {
				g = m.group(1);
			}
			return g == null ? g : g.replace('-', ':');
		}
		return null;
	}
	
}