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This artifact provides various common utility operations for analyzing and manipulating automata and graphs, such as traversal, minimization and copying.

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/* Copyright (C) 2013 TU Dortmund
 * This file is part of AutomataLib, http://www.automatalib.net/.
 * 
 * AutomataLib is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License version 3.0 as published by the Free Software Foundation.
 * 
 * AutomataLib 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 AutomataLib; if not, see
 * http://www.gnu.de/documents/lgpl.en.html.
 */
package net.automatalib.util.traversal;

/**
 * Enum to use for indicating if a node/state has been visited.
 * 
 * Note that this enum only declares one value. The value {@link #NOT_VISITED} for unvisited
 * nodes/states is identified with null.
 * 
 * @author Malte Isberner 
 *
 */
public enum VisitedState {
	/**
	 * Nodes that have already been visited.
	 */
	VISITED;
	
	/**
	 * Nodes that have not yet been visited.
	 */
	public static final VisitedState NOT_VISITED = null;
}