null_data.hh

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//------------------------------------------------------------------------------
// This file is part of the OpenStructure project <www.openstructure.org>
//
// Copyright (C) 2008-2020 by the OpenStructure authors
// Copyright (C) 2003-2010 by the IPLT authors
//
// This library 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 3.0 of the License, or (at your option)
// any later version.
// This library 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 this library; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//------------------------------------------------------------------------------
 
/*
  convenience null data class
 
  Author: Ansgar Philippsen
*/
 
#ifndef IMG_NULL_DATA_H
#define IMG_NULL_DATA_H
 
#include "data.hh"
#include "pixel_sampling.hh"
#include "image_factory.hh"
#include "image_handle.hh"
 
namespace ost { namespace img {
 
 
class DLLEXPORT_OST_IMG_BASE NullData: public Data
{
public:
  virtual DataType GetType() const {return REAL;}
 
  virtual DataDomain GetDomain() const {return SPATIAL;}
 
  virtual Extent GetExtent() const {return Extent();}
 
  virtual Real GetReal(const Point &p) const {return 0.0;}
 
  virtual Complex GetComplex(const Point &p) const {return 0.0;}
 
  virtual Real GetIntpolReal(const Vec3 &v) const {return 0.0;}
  virtual Real GetIntpolReal(const Vec2 &v) const {return 0.0;}
  virtual Real GetIntpolReal(const Real &d) const {return 0.0;}
 
  virtual Complex GetIntpolComplex(const Vec3 &v) const {return 0.0;}
  virtual Complex GetIntpolComplex(const Vec2 &v) const {return 0.0;}
  virtual Complex GetIntpolComplex(const Real &d) const {return 0.0;}
 
  virtual void Apply(NonModAlgorithm& a) const {}
  virtual void ApplyIP(NonModAlgorithm& a) const {}
 
  virtual void SetSpatialOrigin(const Point& o) {}
 
  virtual Point GetSpatialOrigin() const {return Point();}
 
  virtual void Attach(DataObserver *o) const {}
 
  virtual void Detach(DataObserver *o) const {}
 
  virtual void Notify() const {}
 
  virtual ImageHandle Crop(const Extent& e) const {
    return CreateImage();
  }
 
  static Data& Instance() {
    static NullData instance;
    return instance;
  }
 
protected:
  virtual PixelSampling& Sampling() {
    return sampling_;
  }
  virtual const PixelSampling& Sampling() const {
    return sampling_;
  }
 
private:
  PixelSampling sampling_;
};
 
}} // namespace
 
#endif