AbstractGraphLoaderStrategy.h

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/*  Copyright (C) 2008 National Institute For Space Research (INPE) - Brazil.
 
    This file is part of the TerraLib - a Framework for building GIS enabled applications.
 
    TerraLib is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License,
    or (at your option) any later version.
 
    TerraLib 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 Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
    along with TerraLib. See COPYING. If not, write to
    TerraLib Team at <terralib-team@terralib.org>.
 */
 
/*!
  \file AbstractGraphLoaderStrategy.h
 
  \brief This class define the main functions necessary to
        save and load the graph data and metadata information
        using the Graph Data and Graph Cache conceptions.
*/
 
#ifndef __TERRALIB_GRAPH_INTERNAL_ABSTRACTGRAPHLOADERSTRATEGY_H
#define __TERRALIB_GRAPH_INTERNAL_ABSTRACTGRAPHLOADERSTRATEGY_H
 
// Terralib Includes
#include "../core/GraphMetadata.h"
#include "../Config.h"
 
namespace te
{
  namespace graph
  {
    class AbstractGraph;
    class Edge;
    class GraphCache;
    class GraphData;
    class GraphMetadata;
    class Vertex;
    /*!
      \class AbstractGraphLoaderStrategy
 
      \brief This class define the main functions necessary to
        save and load the graph data and metadata information
        using the Graph Cache conception.
 
      \sa AbstractGraph, GraphMetadata, GraphCache
    */
 
    class TEGRAPHEXPORT AbstractGraphLoaderStrategy
    {
      public:
 
        /*! \brief Default constructor. */
        AbstractGraphLoaderStrategy(te::graph::GraphMetadata* metadata);
 
        /*! \brief Default destructor. */
        virtual ~AbstractGraphLoaderStrategy();
 
         /** @name Abstract Graph Loader Strategy Methods
        *  Method used to manager a graph data
        */
        //@{
 
        /*!
        \brief Functio used to load a group of vertex elements given a base element
 
        \param vertexId   Attribute used to identify the base element
 
        \param g          Pointer to a graph, parent of this element
 
        \param gc         This is a optional attribute, if present the cache will be check if the already been loaded
 
        */
        virtual void loadDataByVertexId(int vertexId, te::graph::AbstractGraph* g, te::graph::GraphCache* gc = 0) = 0;
 
        /*!
        \brief Functio used to load a group of edges elements given a base element
 
        \param edgeId     Attribute used to identify the base element
 
        \param g          Pointer to a graph, parent of this element
 
        \param gc         This is a optional attribute, if present the cache will be check if the already been loaded
 
        */
        virtual void loadDataByEdgeId(int edgeId, te::graph::AbstractGraph* g, te::graph::GraphCache* gc = 0) = 0;
 
        /*!
        \brief Save the graph data structure in Data Source
 
        \param data   Pointer to a valid graph data
 
        */
        virtual void saveData(GraphData* data);
 
        /*!
        \brief Function used to remove a edge saved in a data source
 
        \param id The edge identifier
 
        */
        virtual void removeEdge(int id);
 
        /*!
        \brief Function used to remove a vertex saved in a data source
 
        \param id The vertex identifier
 
        */
        virtual void removeVertex(int id);
 
        /*!
          \brief It returns a pointer to a class that describes the graph metadata
 
          \return A valid pointer if exists and null pointer in other case
        */
        te::graph::GraphMetadata* getMetadata();
 
      protected:
 
        /*!
          \brief Used to save the edge elements from a graph data
 
          \param data   Pointer to a valid graph data
        */
        void saveGraphEdgeList(GraphData* data);
 
        /*!
          \brief Used to save the vertex elements attributes from a graph data
 
          \param data   Pointer to a valid graph data
        */
        void saveVertexAttributes(GraphData* data);
 
        /*!
          \brief Used to save the vertex elements from a graph data
 
          \param data   Pointer to a valid graph data
        */
        void saveGraphVertexList(GraphData* data);
 
        /*!
          \brief Used to save the edges elements attributes from a graph data
 
          \param data   Pointer to a valid graph data
        */
        void saveEdgeAttributes(GraphData* data);
 
        /*!
          \brief Function used to load one vertex given a ID
 
          \param id  The vertex identifier
 
          \note This function is used in case the graph was saved using the vertex list
 
          \return  A valid vertex pointer if the element was found and a null pointer in other case
        */
        Vertex* loadVertex(int id);
 
        /*!
          \brief Function used to load one vertex given a ID
 
          \param id  The vertex identifier
 
          \note This function is used in case the graph was saved using the edge list
 
          \return  A valid vertex pointer if the element was found and a null pointer in other case
        */
        Vertex* loadVertexAttrs(int id);
 
        /*!
          \brief Function used to load one edge given a ID
 
          \param id  The edge identifier
 
          \note This function is used in case the graph was saved using the edge list
 
          \return  A valid edge pointer if the element was found and a null pointer in other case
        */
        Edge* loadEdge(int id);
 
        /*!
          \brief Function used to load one edge given a ID
 
          \param id  The edge identifier
 
          \note This function is used in case the graph was saved using the vertex list
 
          \return  A valid vertex pointer if the element was found and a null pointer in other case
        */
        Edge* loadEdgeAttrs(int id);
 
        //@}
 
       protected:
 
        te::graph::GraphMetadata* m_graphMetadata; //!< Graph metadata attribute
    };
  } // end namespace graph
} // end namespace te
 
#endif // __TERRALIB_GRAPH_INTERNAL_ABSTRACTGRAPHLOADERSTRATEGY_H