text: /*
   * $Revision: 2523 $
   *
   * last checkin:
   *   $Author: gutwenger $
   *   $Date: 2012-07-02 20:59:27 +0200 (Mon, 02 Jul 2012) $
   ***************************************************************/
  
  /** \file
   * \brief Declares class AdjacencyOracle.
   *
   * \author Rene Weiskircher
   *
   * \par License:
   * This file is part of the Open Graph Drawing Framework (OGDF).
   *
   * \par
   * Copyright (C)<br>
   * See README.txt in the root directory of the OGDF installation for details.
   *
   * \par
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * Version 2 or 3 as published by the Free Software Foundation;
   * see the file LICENSE.txt included in the packaging of this file
   * for details.
   *
   * \par
   * 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 General Public License for more details.
   *
   * \par
   * You should have received a copy of the GNU General Public
   * License along with this program; if not, write to the Free
   * Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   * Boston, MA 02110-1301, USA.
   *
   * \see  http://www.gnu.org/copyleft/gpl.html
   ***************************************************************/
  
  
  #ifdef _MSC_VER
  #pragma once
  #endif
  
  #ifndef OGDF_ADJACENCY_ORACLE_H
  #define OGDF_ADJACENCY_ORACLE_H
  
  
  #include <ogdf/internal/energybased/EnergyFunction.h>
  #include <ogdf/basic/Array2D.h>
  
  
  namespace ogdf {
  
  //! Tells you in linear time if two nodes are adjacent
  /**
   * AdjacencyOracle is intialized with a Graph and returns for
   * any pair of nodes in constant time if they are adajcent.
   */
  class AdjacencyOracle {
  public:
  	//! The one and only constrcutor for the class
  	AdjacencyOracle(const Graph &G);
  	//! This is the destructor
  	~AdjacencyOracle() {delete m_adjacencyMatrix;}
  	//! This returns true if the two nodes are adjacent in G, false otherwise
  	bool adjacent(const node, const node) const;
  private:
  	NodeArray<int> m_nodeNum; //!< The internal number given to each node
  	Array2D<bool> *m_adjacencyMatrix; //!< A 2D-array where the entry is true if the nodes with the corresponding number are adjacent
  };
  
  }
  #endif
  