itkHashImageFilter.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 itkHashImageFilter_h
#define itkHashImageFilter_h
 
 
#include "itkSimpleDataObjectDecorator.h"
#include "itkImageLinearConstIteratorWithIndex.h"
#include "itkCastImageFilter.h"
#include "itkByteSwapper.h"
 
 
namespace itk
{

template <class TImageType>
class HashImageFilter : public CastImageFilter<TImageType, TImageType>
{
public:
  using Self = HashImageFilter;
  using Superclass = CastImageFilter<TImageType, TImageType>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;
 
  using RegionType = typename TImageType::RegionType;

  itkNewMacro(Self);

  itkTypeMacro(HashImageFilter, CastImageFilter);

  using DataObjectPointer = typename DataObject::Pointer;

  using HashObjectType = SimpleDataObjectDecorator<std::string>;

  std::string
  GetHash() const
  {
    return this->GetHashOutput()->Get();
  }
  HashObjectType *
  GetHashOutput()
  {
    return static_cast<HashObjectType *>(this->ProcessObject::GetOutput(1));
  }
  const HashObjectType *
  GetHashOutput() const
  {
    return static_cast<const HashObjectType *>(this->ProcessObject::GetOutput(1));
  }
 
  enum HashFunction
  {
    SHA1,
    MD5
  };

  itkSetMacro(HashFunction, HashFunction);
  itkGetMacro(HashFunction, HashFunction);

  using DataObjectPointerArraySizeType = ProcessObject::DataObjectPointerArraySizeType;
  using Superclass::MakeOutput;
  DataObjectPointer
  MakeOutput(DataObjectPointerArraySizeType idx) override;
 
protected:
  HashImageFilter();
 
  // virtual ~HashImageFilter(); // implementation not needed
 
  void
  PrintSelf(std::ostream & os, Indent indent) const override;
 
  // See superclass for doxygen documentation
  //
  // This method is to do work after the superclass potential threaded
  // copy.
  void
  AfterThreadedGenerateData() override;
 
  // See superclass for doxygen documentation
  //
  // Override since the filter produces all of its output
  void
  EnlargeOutputRequestedRegion(DataObject * data) override;
 
private:
  HashImageFilter(const Self &); // purposely not implemented
  void
  operator=(const Self &); // purposely not implemented
 
 
  HashFunction m_HashFunction;
};
 
 
} // namespace itk
 
 
#include "itkHashImageFilter.hxx"
 
#endif // itkHashImageFilter_h