itkMetaArrayReader.h

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/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  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 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);

  itkTypeMacro(MetaArrayReader, LightProcessObject);

  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() )
      {
      unsigned int i;
      for ( 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() )
      {
      unsigned int i;
      for ( 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() )
      {
      unsigned int i;
      for ( 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