text: /*=========================================================================
  
    Program:   Insight Segmentation & Registration Toolkit
    Module:    itkFeatureAggregator.h
    Language:  C++
    Date:      $Date$
    Version:   $Revision$
  
    Copyright (c) Insight Software Consortium. All rights reserved.
    See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
  
       This software is distributed WITHOUT ANY WARRANTY; without even
       the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
       PURPOSE.  See the above copyright notices for more information.
  
  =========================================================================*/
  #ifndef __itkFeatureAggregator_h
  #define __itkFeatureAggregator_h
  
  #include "itkFeatureGenerator.h"
  #include "itkImage.h"
  #include "itkImageSpatialObject.h"
  #include "itkProgressAccumulator.h"
  
  namespace itk
  {
  
  /** \class FeatureAggregator
   * \brief Class for combining multiple features into a single one. 
   *
   * This class is the base class for specific implementation of feature
   * mixing strategies.
   *
   * SpatialObjects are used as inputs and outputs of this class.
   *
   * \ingroup SpatialObjectFilters
   * \ingroup LesionSizingToolkit
   */
  template <unsigned int NDimension>
  class ITK_EXPORT FeatureAggregator : public FeatureGenerator<NDimension>
  {
  public:
    /** Standard class typedefs. */
    typedef FeatureAggregator             Self;
    typedef FeatureGenerator<NDimension>  Superclass;
    typedef SmartPointer<Self>            Pointer;
    typedef SmartPointer<const Self>      ConstPointer;
  
    /** This is an abstract class, therefore it doesn't need the itkNewMacro() */
  
    /** Run-time type information (and related methods). */
    itkTypeMacro(FeatureAggregator, FeatureGenerator);
  
    /** Dimension of the space */
    itkStaticConstMacro(Dimension, unsigned int, NDimension);
  
    /** Type of spatialObject that will be passed as input and output of this
     * segmentation method. */
    typedef SpatialObject< NDimension >                 SpatialObjectType;
    typedef typename SpatialObjectType::Pointer         SpatialObjectPointer;
    typedef typename SpatialObjectType::ConstPointer    SpatialObjectConstPointer;
  
    /** Type of the image and specific SpatialObject produced as output */
    typedef float                                                 OutputPixelType;
    typedef Image< OutputPixelType, NDimension >                  OutputImageType;
    typedef ImageSpatialObject< NDimension, OutputPixelType >     OutputImageSpatialObjectType;
  
    /** Type of the class that will generate input features in the form of
     * spatial objects. */
    typedef FeatureGenerator< Dimension >         FeatureGeneratorType;
  
    /**
     * Method for adding a feature generator that will compute the Nth feature to
     * be passed to the segmentation module.
     */
    void AddFeatureGenerator( FeatureGeneratorType * generator ); 
  
    /** Check all feature generators and return consolidate MTime */
    virtual unsigned long GetMTime() const;
  
  protected:
    FeatureAggregator();
    virtual ~FeatureAggregator();
    void PrintSelf(std::ostream& os, Indent indent) const;
  
    /** Method invoked by the pipeline in order to trigger the computation of
     * the segmentation. */
    void  GenerateData();
  
    unsigned int GetNumberOfInputFeatures() const;
  
    typedef typename FeatureGeneratorType::SpatialObjectType      InputFeatureType;
  
    const InputFeatureType * GetInputFeature( unsigned int featureId ) const;
  
    ProgressAccumulator::Pointer              m_ProgressAccumulator;
  
  private:
    FeatureAggregator(const Self&); //purposely not implemented
    void operator=(const Self&); //purposely not implemented
  
    typedef typename FeatureGeneratorType::Pointer                FeatureGeneratorPointer;
    typedef std::vector< FeatureGeneratorPointer >                FeatureGeneratorArrayType;
    typedef typename FeatureGeneratorArrayType::iterator          FeatureGeneratorIterator;
    typedef typename FeatureGeneratorArrayType::const_iterator    FeatureGeneratorConstIterator;
  
    FeatureGeneratorArrayType                 m_FeatureGenerators;
  
    void UpdateAllFeatureGenerators();
  
    void virtual ConsolidateFeatures() = 0;
  
  };
  
  } // end namespace itk
  
  #ifndef ITK_MANUAL_INSTANTIATION
  # include "itkFeatureAggregator.hxx"
  #endif
  
  #endif
  