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/*
* Contraction_visitor.h
*
* Created on: Feb 13, 2014
* Author: dsalinas
*/
#ifndef GUDHI_CONTRACTION_VISITOR_H_
#define GUDHI_CONTRACTION_VISITOR_H_
#include "gudhi/Contraction/Edge_profile.h"
#include "boost/optional.hpp"
namespace Gudhi{
namespace contraction {
/**
*@class Contraction_visitor
*@brief Interface for a visitor of the edge contraction process.
*/
template <typename EdgeProfile>
class Contraction_visitor {//: public Dummy_complex_visitor<typename EdgeProfile::Vertex_handle> {
public:
//typedef typename ComplexType::GeometryTrait GT;
typedef EdgeProfile Profile;
typedef double FT;
typedef typename Profile::Complex Complex;
typedef Complex ComplexType;
typedef typename ComplexType::Point Point;
virtual ~Contraction_visitor(){};
/**
* @brief Called before the edge contraction process starts.
*/
virtual void on_started (ComplexType & complex){}
/**
* @brief Called when the StopPredicate returned true (but not if the algorithm terminates because the surface could not be simplified any further).
*/
virtual void on_stop_condition_reached (const Profile &profile){}
/**
* @brief Called during the collecting phase (when a cost is assigned to the edges), for each edge collected.
*/
virtual void on_collected (const Profile &profile, boost::optional< FT > cost){}
/**
* @brief Called during the processing phase (when edges are contracted), for each edge that is selected.
*/
virtual void on_selected (const Profile &profile, boost::optional< FT > cost, int initial_count, int current_count){}
/**
* @brief Called when an edge is about to be contracted and replaced by a vertex whose position is *placement.
*/
virtual void on_contracting(const Profile &profile, boost::optional< Point > placement){
}
/**
* @brief Called when after an edge has been contracted onto a new point placement.
* A possibility would to remove popable blockers at this point for instance.
*/
virtual void on_contracted(const Profile &profile, boost::optional< Point > placement){
}
/**
* @brief Called for each selected edge which cannot be contracted because the ValidContractionPredicate is false
*/
virtual void on_non_valid(const Profile &profile){}
};
} // namespace contraction
} // namespace GUDHI
#endif /* GUDHI_CONTRACTION_VISITOR_H_ */
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