//  //
//  #### #     #   #                                -= SQLiteX =-                              //
// #     #     ## ## SQLiteX.h                                                                 //
//  ##   #      ###                                                                            //
//   ##  #      ###  SQLite main header                                                        //
//     # #     ## ##                                                                           //
// ####  ##### #   # R1                                   (C)2005 Markus Ewald -> License.txt  //
//  //
#ifndef SQLITEX_SQLITEX_H
#define SQLITEX_SQLITEX_H

#include "SQLiteX/Config.h"
#include "SQLite/sqlite3.h"

namespace SQLiteX {

//  //
//  SQLiteX::SharedSQLite3                                                                     //
//  //
/// Shared sqlite database handle
/** This class keeps an sqlite database used by multiple objects alive until the
    database can be released.
*/
class SharedSQLite3 {
  public:
    /// Constructor
    SQLITEX_API explicit SharedSQLite3(sqlite3 *pSQLite) :
      m_pRefCount(0),
      m_pSQLite(pSQLite) {
      
      m_pRefCount = new size_t(1);
    }

    /// Copy constructor
    SQLITEX_API SharedSQLite3(const SharedSQLite3 &Other) :
      m_pRefCount(Other.m_pRefCount),
      m_pSQLite(Other.m_pSQLite) {
      ++(*m_pRefCount);
    }

    /// Destructor
    SQLITEX_API ~SharedSQLite3() {
      release();
    }

    /// Copy assignment operator
    SQLITEX_API SharedSQLite3 &operator =(const SharedSQLite3 &Other) {
      release();

      m_pSQLite = Other.m_pSQLite;
      m_pRefCount = Other.m_pRefCount;
      ++(*m_pRefCount);

      return *this;
    }

    /// Implicit conversion to constant sqlite database handle
    SQLITEX_API operator sqlite3 *() const { return m_pSQLite; }

  private:
    /// Release the sqlite database handle
    void release() {
      if(m_pRefCount) {
        if(!--(*m_pRefCount)) {
          ::sqlite3_close(m_pSQLite);
          delete m_pRefCount;
        }
        m_pRefCount = 0;
      }
    }

    /// The sqlite database handle
    sqlite3 *m_pSQLite;
    /// Reference counter, shared by all clones of an instance
    size_t *m_pRefCount;
};

} // namespace SQLiteX

#endif // SQLITEX_SQLITEX_H