HypergraphObserver.h

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#pragma once
 
#include <ogdf/basic/List.h>
#include <ogdf/hypergraph/Hypergraph.h>
 
namespace ogdf {
 
// HypergraphObserver
class OGDF_EXPORT HypergraphObserver {
    friend class Hypergraph;
 
protected:
    const Hypergraph* m_hypergraph;
 
    ListIterator<HypergraphObserver*> m_itObserver;
 
public:
    HypergraphObserver() : m_hypergraph(nullptr) { }
 
    explicit HypergraphObserver(const Hypergraph* pH) {
        m_hypergraph = pH;
        m_itObserver = pH->registerObserver(this);
    }
 
    virtual ~HypergraphObserver() {
        if (m_hypergraph) {
            m_hypergraph->unregisterObserver(m_itObserver);
        }
    }
 
    void init(const Hypergraph* pH) {
        if (m_hypergraph) {
            m_hypergraph->unregisterObserver(m_itObserver);
        }
 
        if (pH) {
            m_hypergraph = pH;
            m_itObserver = pH->registerObserver(this);
        }
    }
 
    virtual void hypernodeDeleted(hypernode v) = 0;
 
    virtual void hypernodeAdded(hypernode v) = 0;
 
    virtual void hyperedgeDeleted(hyperedge e) = 0;
 
    virtual void hyperedgeAdded(hyperedge e) = 0;
 
    virtual void cleared() = 0;
 
    const Hypergraph* hypergraph() const { return m_hypergraph; }
};
 
}