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/*
* $Revision: 2523 $
*
* last checkin:
* $Author: gutwenger $
* $Date: 2012-07-02 20:59:27 +0200 (Mon, 02 Jul 2012) $
***************************************************************/
/** \file
* \brief Abstract base class for structures on graphs, that need
* to be informed about cluster graph changes.
*
* Follows the observer pattern: cluster graphs are observable
* objects that can inform observers on changes made to their
* structure.
*
* \author Martin Gronemann
*
* \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_CLUSTER_GRAPH_OBSERVER_H
#define OGDF_CLUSTER_GRAPH_OBSERVER_H
#include "../basic/List.h"
#include "ClusterGraph.h"
namespace ogdf {
//----------------------------------------------------------
// GraphObserver
// abstract base class
// derived classes have to overload nodeDeleted, nodeAdded
// edgeDeleted, edgeAdded
// these functions should be called by Graph before (delete)
// and after (add) its structure
//----------------------------------------------------------
class OGDF_EXPORT ClusterGraphObserver {
friend class ClusterGraph;
public:
ClusterGraphObserver() : m_pClusterGraph(0) {}
ClusterGraphObserver(const ClusterGraph* CG) : m_pClusterGraph(CG)
{
m_itCGList = CG->registerObserver(this);
}//constructor
virtual ~ClusterGraphObserver()
{
if (m_pClusterGraph) m_pClusterGraph->unregisterObserver(m_itCGList);
}//destructor
// associates structure with different graph
void reregister(const ClusterGraph *pCG) {
//small speedup: check if == m_pGraph
if (m_pClusterGraph) m_pClusterGraph->unregisterObserver(m_itCGList);
if ((m_pClusterGraph = pCG) != 0) m_itCGList = pCG->registerObserver(this);
}
virtual void clusterDeleted(cluster v) = 0;
virtual void clusterAdded(cluster v) = 0;
//virtual void reInit() = 0;
//virtual void cleared() = 0;//Graph cleared
const ClusterGraph* getGraph() const { return m_pClusterGraph;}
protected:
const ClusterGraph* m_pClusterGraph; //underlying clustergraph
//List entry in cluster graphs list of all registered observers
ListIterator<ClusterGraphObserver*> m_itCGList;
};
} // end of namespace
#endif
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