itkHistogramThresholdCalculator.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
 *
 *         https://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 itkHistogramThresholdCalculator_h
#define itkHistogramThresholdCalculator_h
 
#include "itkObject.h"
#include "itkObjectFactory.h"
#include "itkNumericTraits.h"
#include "itkSimpleDataObjectDecorator.h"
#include "itkProgressReporter.h"
 
namespace itk
{

template <typename THistogram, typename TOutput>
class HistogramThresholdCalculator : public ProcessObject
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(HistogramThresholdCalculator);

  using Self = HistogramThresholdCalculator;
  using Superclass = ProcessObject;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(HistogramThresholdCalculator);

  using HistogramType = THistogram;

  using OutputType = TOutput;
  using DecoratedOutputType = SimpleDataObjectDecorator<OutputType>;
 
  void
  SetInput(const HistogramType * input)
  {
    // Process object is not const-correct so the const_cast is required here
    this->ProcessObject::SetNthInput(0, const_cast<HistogramType *>(input));
  }
 
  const HistogramType *
  GetInput() const
  {
    if (this->GetNumberOfInputs() < 1)
    {
      return nullptr;
    }
    return static_cast<const HistogramType *>(this->ProcessObject::GetInput(0));
  }
 
  DecoratedOutputType *
  GetOutput()
  {
    if (this->GetNumberOfOutputs() < 1)
    {
      return nullptr;
    }
    return static_cast<DecoratedOutputType *>(this->ProcessObject::GetOutput(0));
  }
 
  using Superclass::MakeOutput;
  typename DataObject::Pointer
  MakeOutput(DataObjectPointerArraySizeType) override
  {
    return DecoratedOutputType::New().GetPointer();
  }
 
  const OutputType &
  GetThreshold()
  {
    if (this->GetNumberOfOutputs() < 1)
    {
      itkExceptionStringMacro("No output available.");
    }
    return static_cast<DecoratedOutputType *>(this->ProcessObject::GetOutput(0))->Get();
  }
 
protected:
  HistogramThresholdCalculator()
  {
    this->ProcessObject::SetNumberOfRequiredOutputs(1);
    this->ProcessObject::SetNthOutput(0, this->MakeOutput(0));
  }
  ~HistogramThresholdCalculator() override = default;
  using ProcessObject::SetInput;
};
 
} // end namespace itk
 
#endif