ConnectedSubgraphFinder.h

/**********************************************************************
 * $Id: ConnectedSubgraphFinder.h 2556 2009-06-06 22:22:28Z strk $
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.refractions.net
 *
 * Copyright (C) 2001-2002 Vivid Solutions Inc.
 * Copyright (C) 2005-2006 Refractions Research Inc.
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU Lesser General Public Licence as published
 * by the Free Software Foundation. 
 * See the COPYING file for more information.
 *
 **********************************************************************/

#ifndef GEOS_PLANARGRAPH_ALGO_CONNECTEDSUBGRAPHFINDER_H
#define GEOS_PLANARGRAPH_ALGO_CONNECTEDSUBGRAPHFINDER_H

#include <geos/export.h>
#include <geos/planargraph/PlanarGraph.h> // for inlines

#include <stack>
#include <vector>

// Forward declarations
namespace geos {
        namespace planargraph { 
                class PlanarGraph;
                class Subgraph;
                class Node;
        }
}

namespace geos {
namespace planargraph { // geos::planargraph
namespace algorithm { // geos::planargraph::algorithm

class GEOS_DLL ConnectedSubgraphFinder
{
private:
        PlanarGraph& graph;

        Subgraph* findSubgraph(Node* node);


        void addReachable(Node* node, Subgraph* subgraph);

        void addEdges(Node* node, std::stack<Node *>& nodeStack,
                        Subgraph* subgraph);

public:

        ConnectedSubgraphFinder(PlanarGraph& newGraph)
                :
                graph(newGraph)
                {}

        void getConnectedSubgraphs(std::vector<Subgraph *>& dest);

};

} // namespace geos::planargraph::algorithm
} // namespace geos::planargraph
} // namespace geos

#endif // GEOS_PLANARGRAPH_ALGO_CONNECTEDSUBGRAPHFINDER_H

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