creaImageIOTreeHandler.h

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#ifndef __creaImageIOTreeHandler_h_INCLUDED__
#define __creaImageIOTreeHandler_h_INCLUDED__

#include <creaImageIOTree.h>

namespace creaImageIO
{


  //=======================================================================
  //class TreeHandlerStatistics;
  //=======================================================================
  //=======================================================================

  class TreeHandler
  {
  public:

    //====================================================================
    //  typedef TreeHandlerStatistics Statistics;
    //====================================================================

    //====================================================================
    TreeHandler() {}
    virtual ~TreeHandler() {}
    //====================================================================

    //====================================================================
    tree::Tree& GetTree() { return mTree; }
    const tree::Tree& GetTree() const { return mTree; }
    //====================================================================

    //====================================================================
    // QUERY METHODS
    virtual bool IsReadable() { return false; }
    virtual bool IsWritable() { return false; }
    //====================================================================


    //====================================================================
    // INITIALIZATION / FINALIZATION
    //====================================================================

    //====================================================================
    // Default mode is read only 
    // If IsWritable and writable==true then opens in read/write mode
    virtual bool Open(bool writable = false) { return false; }
    virtual bool Close() { return false; }
    // Default mode is read only 
    // If IsWritable and writable==true then opens in read/write mode
    virtual bool Create(bool writable = false) { return false; }
    virtual bool Destroy() { return false; }
        virtual void BeginTransaction(){}
        virtual void EndTransaction(){}
    //====================================================================


    //====================================================================
    // READ METHODS
    //====================================================================


    //====================================================================
    // REM : The Tree itself is a Node and asking for its number of 
    //       children returns the number of children of level 1.
    virtual unsigned int GetNumberOfChildren(tree::Node* n) { return 0; }
    //====================================================================

        //====================================================================
        virtual void GetAttribute(std::string levelDescriptor,
                                                                           std::string searchParam, 
                                                                           std::string searchVal, 
                                                                           std::string key, 
                                                                           std::string& result){}
    //====================================================================

    //====================================================================
    // is reached.
    // If maxlevel <= 0 then loads all the sub-tree rooted at parent 
    // If parent == NULL or parent == tree then starts with the 'children' of 
    // the tree itself.
    // Returns the total number of children loaded.
    virtual int LoadChildren(tree::Node* parent, int maxlevel) 
    { return 0; }
    //====================================================================

    //====================================================================
    // WITHOUT altering the source, e.g. the database
    virtual void UnLoad(tree::Node* n) { return; }
    //====================================================================

        //====================================================================
    virtual void GetTopLevelNodeId(const std::string& searchParam, 
                                                                                        const std::string& searchValue, 
                                                                                        std::string& parent_id){ return; }


    //====================================================================
    // WRITE METHODS : WORK ONLY IN WRITE MODE
    //====================================================================
    typedef tree::Node::AttributeMapType AttributeMapType;
    // returns the Level in the tree where the branch was connected 
    // (-1 for error, 0 for top level, etc. ) 
    // Of course the branch is loaded on exit
    virtual int AddBranch( const AttributeMapType& ) { return -1; }
    virtual bool Remove(tree::Node*)  { return false; }
    virtual bool SetAttribute(tree::Node*, 
                              const std::string& key,
                              const std::string& value) { return false; }
        // Sets an attribute
    virtual void SetAttribute(const std::string& levelDescriptor, 
                              const std::string& key,
                              const std::string& value,
                                  const std::string& searchParam, 
                                  const std::string& searchVal){}
        //Deletes the tuple that matches the parameters given
        virtual void DeleteTuple(std::string levelDescriptor, std::string key, std::string value){}
        //Deletes the entries that match the parameters given
        virtual void RemoveEntries(const std::string i_table, 
                const std::string i_attribute, 
                const std::string i_operand, 
                const std::string i_val){}
 
    //====================================================================
        virtual void getAllAttributes(std::string i_filename, std::map<std::string, std::string> &i_results) =0;

  private:
    tree::Tree mTree;

  };
  // EO class TreeHandler
  //=======================================================================
  /*
  //=======================================================================
  // (nodes created, removed, ...)
  class TreeHandlerStatistics
  {
  public:
    //====================================================================
    TreeHandler(TreeHandler* tree) : mTreeHandler(tree) { Reset(); }
    ~TreeHandler() {}
    void Reset();
    void Print();

    void CreateNode(int level) { mNumberCreatedNode[level]++; }
    void DeleteNode(int level) { mNumberDeletedNode[level]++; }

  protected:
      TreeHandler* mTreeHandler;
    std::vector<int> mNumberCreatedNode;
    std::vector<int> mNumberDeletedNode;
    
    
  };
  // EO class TreeHandlerStatistics
  //=======================================================================
  */

} // EO namespace creaImageIO

// EOF
#endif