itkImageFileReader.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkImageFileReader.h,v $
  Language:  C++
  Date:      $Date: 2007/09/06 18:31:36 $
  Version:   $Revision: 1.31 $

  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 __itkImageFileReader_h
#define __itkImageFileReader_h

#include "itkImageIOBase.h"
#include "itkImageSource.h"
#include "itkExceptionObject.h"
#include "itkSize.h"
#include "itkImageRegion.h"
#include "itkDefaultConvertPixelTraits.h"

namespace itk
{

class ImageFileReaderException : public ExceptionObject 
{
public:
  itkTypeMacro( ImageFileReaderException, ExceptionObject );

  ImageFileReaderException(const char *file, unsigned int line, 
                           const char* message = "Error in IO",
                           const char* loc = "Unknown") :
    ExceptionObject(file, line, message, loc)
  {
  }

  ImageFileReaderException(const std::string &file, unsigned int line, 
                           const char* message = "Error in IO",
                           const char* loc = "Unknown") : 
    ExceptionObject(file, line, message, loc)
  {
  }
};


template <class TOutputImage,
          class ConvertPixelTraits=DefaultConvertPixelTraits< 
                   ITK_TYPENAME TOutputImage::IOPixelType > >
class ITK_EXPORT ImageFileReader : public ImageSource<TOutputImage>
{
public:
  typedef ImageFileReader           Self;
  typedef ImageSource<TOutputImage> Superclass;
  typedef SmartPointer<Self>        Pointer;

  itkNewMacro(Self);

  itkTypeMacro(ImageFileReader, ImageSource);

  typedef typename TOutputImage::SizeType  SizeType;

  typedef typename TOutputImage::IndexType  IndexType;

  typedef typename TOutputImage::RegionType  ImageRegionType;

  typedef typename TOutputImage::InternalPixelType OutputImagePixelType;

  itkSetStringMacro(FileName);
  itkGetStringMacro(FileName);

  void  SetImageIO( ImageIOBase * imageIO );
  itkGetObjectMacro(ImageIO,ImageIOBase);

  virtual void GenerateOutputInformation(void);

  virtual void EnlargeOutputRequestedRegion(DataObject *output);

  itkSetMacro(UseStreaming,bool);
  itkGetConstReferenceMacro(UseStreaming,bool);
  itkBooleanMacro(UseStreaming);

protected:
  ImageFileReader();
  ~ImageFileReader();
  void PrintSelf(std::ostream& os, Indent indent) const;
  
  void DoConvertBuffer(void* buffer, unsigned long numberOfPixels);

  void TestFileExistanceAndReadability();

  virtual void GenerateData();

  ImageIOBase::Pointer m_ImageIO;
  bool                 m_UserSpecifiedImageIO; // keep track whether the
                                               // ImageIO is user specified 

  std::string m_FileName; // The file to be read

  bool m_UseStreaming;
  
private:
  ImageFileReader(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented
  std::string m_ExceptionMessage;  

  // The region that the ImageIO class will return when we ask it to produce a
  // requested region.
  ImageRegionType m_StreamableRegion; 
};


} //namespace ITK

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkImageFileReader.txx"
#endif

#endif // __itkImageFileReader_h

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