sitkImageFileReader.h

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/*=========================================================================
*
*  Copyright NumFOCUS
*
*  Licensed under the Apache License, Version 2.0 (the "License");
*  you may not use this file except in compliance with the License.
*  You may obtain a copy of the License at
*
*         http://www.apache.org/licenses/LICENSE-2.0.txt
*
*  Unless required by applicable law or agreed to in writing, software
*  distributed under the License is distributed on an "AS IS" BASIS,
*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*  See the License for the specific language governing permissions and
*  limitations under the License.
*
*=========================================================================*/
#ifndef sitkImageFileReader_h
#define sitkImageFileReader_h
 
#include "sitkMacro.h"
#include "sitkImage.h"
#include "sitkImageReaderBase.h"
#include "sitkMemberFunctionFactory.h"
 
 
namespace itk {
 
  class MetaDataDictionary;
 
  namespace simple {
 
    class SITKIO_EXPORT ImageFileReader
      : public ImageReaderBase
    {
    public:
      using Self = ImageFileReader;
 
      ~ImageFileReader() override;
 
      ImageFileReader();
 
      std::string ToString() const override;
 
      std::string GetName() const override { return std::string("ImageFileReader"); }
 
      SITK_RETURN_SELF_TYPE_HEADER SetFileName ( const std::string &fn );
      std::string GetFileName() const;
 
      Image Execute() override;
 
      // Interface methods to access image file's meta-data and image
      // information after calling Execute or after calling
      // MetaDataRead, which does not load the bulk pixel data.
 
      void ReadImageInformation();
 
      PixelIDValueEnum GetPixelID( ) const;
      PixelIDValueType GetPixelIDValue( ) const;
      unsigned int GetDimension( ) const;
      unsigned int GetNumberOfComponents( ) const;
      const std::vector<double> &GetOrigin( ) const;
      const std::vector<double> &GetSpacing( ) const;
      const std::vector<double> &GetDirection() const;
      const std::vector<uint64_t> &GetSize( ) const;
      std::vector<std::string> GetMetaDataKeys( ) const;
 
      bool HasMetaDataKey( const std::string &key ) const;
 
      std::string GetMetaData( const std::string &key ) const;
 
 
      SITK_RETURN_SELF_TYPE_HEADER SetExtractSize( const std::vector<unsigned int> &size);
      const std::vector<unsigned int> &GetExtractSize( ) const;
 
 
      SITK_RETURN_SELF_TYPE_HEADER SetExtractIndex( const std::vector<int> &index );
      const std::vector<int> &GetExtractIndex(  ) const;
 
    protected:
 
      template <class TImageType> Image ExecuteInternal ( itk::ImageIOBase * );
 
      void UpdateImageInformationFromImageIO( const itk::ImageIOBase* iobase );
 
    private:
 
      // Internal method used implement extracting a region from the reader
      template <class TImageType, class TInternalImageType>
        Image ExecuteExtract( TInternalImageType * itkImage );
 
      // function pointer type
      typedef Image (Self::*MemberFunctionType)( itk::ImageIOBase * );
 
      // friend to get access to executeInternal member
      friend struct detail::MemberFunctionAddressor<MemberFunctionType>;
      std::unique_ptr<detail::MemberFunctionFactory<MemberFunctionType> > m_MemberFactory;
 
 
      std::function<std::vector<std::string>()> m_pfGetMetaDataKeys;
      std::function<bool(const std::string &)> m_pfHasMetaDataKey;
      std::function<std::string(const std::string &)> m_pfGetMetaData;
 
      std::string m_FileName;
 
      std::unique_ptr<MetaDataDictionary> m_MetaDataDictionary;
 
      PixelIDValueEnum     m_PixelType;
      unsigned int         m_Dimension;
      unsigned int         m_NumberOfComponents;
      std::vector<double>  m_Direction;
      std::vector<double>  m_Origin;
      std::vector<double>  m_Spacing;
 
      std::vector<uint64_t> m_Size;
 
      std::vector<unsigned int> m_ExtractSize;
      std::vector<int>          m_ExtractIndex;
    };
 
  SITKIO_EXPORT Image ReadImage ( const std::string &filename,
                                  PixelIDValueEnum outputPixelType = sitkUnknown,
                                  const std::string &imageIO = "");
  }
}
 
#endif