// =========================================================================
// @author Leonardo Florez Valencia
// @email florez-l@javeriana.edu.co
// =========================================================================
#ifndef __fpa__Filters__QueueAlgorithm__h__
#define __fpa__Filters__QueueAlgorithm__h__

#include <deque>
#include <fpa/Config.h>

namespace fpa
{
  namespace Filters
  {
      /**
       */
      template< class _TDataInterface >
      class QueueAlgorithm
        : public _TDataInterface
      {
      public:
        typedef _TDataInterface                 Superclass;
        typedef QueueAlgorithm                  Self;
        typedef itk::SmartPointer< Self >       Pointer;
        typedef itk::SmartPointer< const Self > ConstPointer;

        typedef typename Superclass::TTraits TTraits;
        fpaTraitsMacro( typename TTraits );

        typedef std::deque< TNode > TQueue;

      public:
        itkTypeMacro( fpa::Filters::QueueAlgorithm, TDataInterface );

      protected:
        QueueAlgorithm( bool double_buffer );
        virtual ~QueueAlgorithm( );

        virtual void _QueueSwap( );
        virtual void _QueueClear( ) override;
        virtual TNode _QueuePop( ) override;
        virtual void _QueuePush( const TNode& n ) override;
        virtual unsigned long _QueueSize( ) const override;

      private:
        QueueAlgorithm( const Self& other );
        Self& operator=( const Self& other );

      protected:
        TQueue       m_Queues[ 2 ];
        unsigned int m_CurrQueue;
        bool         m_DoubleBuffer;
      };

    } // ecapseman

} // ecapseman

#ifndef ITK_MANUAL_INSTANTIATION
#  include <fpa/Filters/QueueAlgorithm.hxx>
#endif // ITK_MANUAL_INSTANTIATION
#endif // __fpa__Filters__QueueAlgorithm__h__
// eof - $RCSfile$