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/*
* $Revision: 3505 $
*
* last checkin:
* $Author: beyer $
* $Date: 2013-05-16 14:49:47 +0200 (Thu, 16 May 2013) $
***************************************************************/
/** \file
* \brief Abstract base class for observers on hypergraphs, that
* need to be informed about hypergraph changes
* (e.g. associated graph edge standard representation).
*
* Follows the observer pattern: hypergraphs are observable
* objects that can inform observers on changes made to their
* structure.
*
* Based on the original GraphObserver class written by Karsten Klein.
*
* \author Ondrej Moris
*
* \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_HYPERGRAPH_OBSERVER_H
#define OGDF_HYPERGRAPH_OBSERVER_H
#include <ogdf/basic/List.h>
#include <ogdf/hypergraph/Hypergraph.h>
namespace ogdf {
// HypergraphObserver
class OGDF_EXPORT HypergraphObserver
{
friend class Hypergraph;
protected:
//! Observed hypergraph.
const Hypergraph *m_hypergraph;
//! List of all registered hypergraph observers.
ListIterator<HypergraphObserver *> m_itObserver;
public:
//! Constructor.
HypergraphObserver()
: m_hypergraph(0)
{
}
//! Constructor assigning \a pH hypergraph to the observer.
HypergraphObserver(const Hypergraph *pH)
{
m_hypergraph = pH;
m_itObserver = pH->registerObserver(this);
}
//! Destructor.
virtual ~HypergraphObserver()
{
if (m_hypergraph)
m_hypergraph->unregisterObserver(m_itObserver);
}
//! Associates an observer instance with hypergraph \a H
void init(const Hypergraph *pH) {
if (m_hypergraph)
m_hypergraph->unregisterObserver(m_itObserver);
if (pH) {
m_hypergraph = pH;
m_itObserver = pH->registerObserver(this);
}
}
//! Called by an observed hypergraph when a hypernode is deleted.
virtual void hypernodeDeleted(hypernode v) = 0;
//! Called by an observed hypergraph when a hypernode is added.
virtual void hypernodeAdded(hypernode v) = 0;
//! Called by an observed hypergraph when a hyperedge is deleted.
virtual void hyperedgeDeleted(hyperedge e) = 0;
//! Called by an observed hypergraph when a hyperedge is added.
virtual void hyperedgeAdded(hyperedge e) = 0;
//! Called by the observed hypergraph when it is cleared.
virtual void cleared() = 0;
//! Retunrs the observer hypergraph.
const Hypergraph * hypergraph() const
{
return m_hypergraph;
}
};
} //end namespace ogdf
#endif
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