itkMetaArrayReader.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 itkMetaArrayReader_h
#define itkMetaArrayReader_h
#include "ITKIOMetaExport.h"
 
#include "itkLightProcessObject.h"
#include "itkArray.h"
#include "itkCovariantVector.h"
#include "itkVariableLengthVector.h"
#include "metaArray.h"
 
namespace itk
{
class ITKIOMeta_EXPORT MetaArrayReader : public LightProcessObject
{
public:
  using Self = MetaArrayReader;
  using Superclass = LightProcessObject;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(MetaArrayReader);

  itkSetStringMacro(FileName);

  itkGetStringMacro(FileName);

  MetaArray *
  GetMetaArrayPointer();

  void
  SetBuffer(void * _buffer);

  void
  Update();

  MET_ValueEnumType
  GetDataType() const
  {
    return m_MetaArray.ElementType();
  }

  int
  Size() const
  {
    return m_MetaArray.Length();
  }

  int
  GetNumberOfElements() const
  {
    return m_MetaArray.Length();
  }

  int
  GetVectorDimension() const
  {
    return m_MetaArray.Length();
  }

  int
  GetNumberOfComponents() const
  {
    return m_MetaArray.Length();
  }

  int
  GetCovariantVectorDimension() const
  {
    return m_MetaArray.Length();
  }

  template <typename TValue>
  inline void
  GetElement(TValue & value, unsigned int i, unsigned int channel = 0) const
  {
    value = static_cast<TValue>(m_MetaArray.ElementData(i * m_MetaArray.ElementNumberOfChannels() + channel));
  }

  template <typename TValue>
  void
  GetOutput(MET_ValueEnumType _metaElementType, Array<TValue> * _array, bool _letArrayManageData = true)
  {
    if (m_MetaArray.ElementType() != _metaElementType)
    {
      m_MetaArray.ConvertElementDataTo(_metaElementType);
    }
    _array->SetData((TValue *)(m_MetaArray.ElementData()), m_MetaArray.Length(), _letArrayManageData);
    if (_letArrayManageData)
    {
      m_MetaArray.AutoFreeElementData(false);
    }
  }

  template <typename TValue, unsigned int VLength>
  bool
  GetOutput(MET_ValueEnumType itkNotUsed(_metaElementType), FixedArray<TValue, VLength> * _array)
  {
    if (static_cast<int>(VLength) <= m_MetaArray.Length())
    {
      for (unsigned int i = 0; i < VLength; ++i)
      {
        this->GetElement((*_array)[i], i);
      }
      return true;
    }
    return false;
  }

  template <typename TValue, unsigned int VLength>
  bool
  GetOutput(MET_ValueEnumType itkNotUsed(_metaElementType), Vector<TValue, VLength> * _vector)
  {
    if (static_cast<int>(VLength) <= m_MetaArray.Length())
    {
      for (unsigned int i = 0; i < VLength; ++i)
      {
        this->GetElement((*_vector)[i], i);
      }
      return true;
    }
    return false;
  }

  template <typename TValue, unsigned int VLength>
  bool
  GetOutput(MET_ValueEnumType itkNotUsed(_metaElementType), CovariantVector<TValue, VLength> * _vector)
  {
    if (static_cast<int>(VLength) <= m_MetaArray.Length())
    {
      for (unsigned int i = 0; i < VLength; ++i)
      {
        this->GetElement((*_vector)[i], i);
      }
      return true;
    }
    return false;
  }

  template <typename TValue>
  void
  GetOutput(MET_ValueEnumType              _metaElementType,
            VariableLengthVector<TValue> * _vector,
            bool                           _letVectorManageData = true)
  {
    if (m_MetaArray.ElementType() != _metaElementType)
    {
      m_MetaArray.ConvertElementDataTo(_metaElementType);
    }
    _vector->SetData((TValue *)(m_MetaArray.ElementData()), m_MetaArray.Length(), _letVectorManageData);
    if (_letVectorManageData)
    {
      m_MetaArray.AutoFreeElementData(false);
    }
  }

  template <typename TValue>
  void
  GetMultiChannelOutput(MET_ValueEnumType _metaElementType, Array<TValue> * _array)
  {
    if (m_MetaArray.ElementType() != _metaElementType)
    {
      m_MetaArray.ConvertElementDataTo(_metaElementType);
    }
    int rows = m_MetaArray.Length();
    int cols = m_MetaArray.ElementNumberOfChannels();
    _array->SetSize(rows);
    for (int i = 0; i < rows; ++i)
    {
      (*_array)[i].SetSize(cols);
      for (int j = 0; j < cols; ++j)
      {
        (*_array)[i][j] = static_cast<typename TValue::ValueType>(m_MetaArray.ElementData(i * cols + j));
      }
    }
  }
 
protected:
  MetaArrayReader();
  ~MetaArrayReader() override;
  void
  PrintSelf(std::ostream & os, Indent indent) const override;
 
private:
  MetaArray m_MetaArray{};
 
  std::string m_FileName{};
 
  void * m_Buffer{ nullptr };
};
} // namespace itk
 
#endif // itkMetaArrayReader_h