itkLabelObject.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 itkLabelObject_h
#define itkLabelObject_h

#include <deque>
#include "itkLightObject.h"
#include "itkLabelObjectLine.h"
#include "itkWeakPointer.h"
#include "itkObjectFactory.h"

namespace itk
{
template< typename TLabel, unsigned int VImageDimension >
class ITK_TEMPLATE_EXPORT LabelObject:public LightObject
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(LabelObject);

  using Self = LabelObject;
  using Superclass = LightObject;
  using LabelObjectType = Self;
  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;
  using ConstWeakPointer = WeakPointer< const Self >;

  itkNewMacro(Self);

  itkTypeMacro(LabelObject, LightObject);

  static constexpr unsigned int ImageDimension = VImageDimension;

  using IndexType = Index< VImageDimension >;
  using OffsetType = Offset< VImageDimension >;
  using LabelType = TLabel;
  using LineType = LabelObjectLine< VImageDimension >;
  using LengthType = typename LineType::LengthType;
  using AttributeType = unsigned int;
  using SizeValueType = itk::SizeValueType;

  static constexpr AttributeType LABEL = 0;

  static AttributeType GetAttributeFromName(const std::string & s);

  static std::string GetNameFromAttribute(const AttributeType & a);

  const LabelType & GetLabel() const;

  void SetLabel(const LabelType & label);

  bool HasIndex(const IndexType & idx) const;

  void AddIndex(const IndexType & idx);

  bool RemoveIndex(const IndexType & idx );

  void AddLine(const IndexType & idx, const LengthType & length);

  void AddLine(const LineType & line);

  SizeValueType GetNumberOfLines() const;

  const LineType & GetLine(SizeValueType i) const;

  LineType & GetLine(SizeValueType i);

  SizeValueType Size() const;

  bool Empty() const;

  void Clear();

  IndexType GetIndex(SizeValueType i) const;

  template< typename TSourceLabelObject >
  void CopyLinesFrom(const TSourceLabelObject *src);

  template< typename TSourceLabelObject >
  void CopyAttributesFrom(const TSourceLabelObject *src);

  template< typename TSourceLabelObject >
  void CopyAllFrom(const TSourceLabelObject *src);

  void Optimize();

  void Shift( OffsetType offset );

  class ConstLineIterator
  {
  public:

    ConstLineIterator() = default;

    ConstLineIterator(const Self *lo)
    {
      m_Begin = lo->m_LineContainer.begin();
      m_End = lo->m_LineContainer.end();
      m_Iterator = m_Begin;
    }

    ConstLineIterator(const ConstLineIterator & iter)
    {
      m_Iterator = iter.m_Iterator;
      m_Begin = iter.m_Begin;
      m_End = iter.m_End;
    }

    ConstLineIterator & operator=(const ConstLineIterator & iter)
    {
      m_Iterator = iter.m_Iterator;
      m_Begin = iter.m_Begin;
      m_End = iter.m_End;
      return *this;
    }

    const LineType & GetLine() const
    {
      return *m_Iterator;
    }

    ConstLineIterator operator++(int)
    {
      ConstLineIterator tmp = *this;
      ++(*this);
      return tmp;
    }

    ConstLineIterator & operator++()
    {
      ++m_Iterator;
      return *this;
    }

  bool operator==(const ConstLineIterator & iter) const
    {
    return m_Iterator == iter.m_Iterator && m_Begin == iter.m_Begin && m_End == iter.m_End;
    }

  bool operator!=(const ConstLineIterator & iter) const
    {
    return !( *this == iter );
    }

  void GoToBegin()
    {
      m_Iterator = m_Begin;
    }

    bool IsAtEnd() const
    {
      return m_Iterator == m_End;
    }

  private:
    using LineContainerType = typename std::deque< LineType >;
    using InternalIteratorType = typename LineContainerType::const_iterator;
    InternalIteratorType m_Iterator;
    InternalIteratorType m_Begin;
    InternalIteratorType m_End;
  };

  class ConstIndexIterator
  {
  public:

    ConstIndexIterator():
      m_Iterator(),
      m_Begin(),
      m_End()
        {
        m_Index.Fill(0);
        }

    ConstIndexIterator(const Self *lo)
    {
      m_Begin = lo->m_LineContainer.begin();
      m_End = lo->m_LineContainer.end();
      GoToBegin();
    }

    ConstIndexIterator(const ConstIndexIterator & iter)
    {
      m_Iterator = iter.m_Iterator;
      m_Index = iter.m_Index;
      m_Begin = iter.m_Begin;
      m_End = iter.m_End;
    }

    ConstIndexIterator & operator=(const ConstIndexIterator & iter)
    {
      m_Iterator = iter.m_Iterator;
      m_Index = iter.m_Index;
      m_Begin = iter.m_Begin;
      m_End = iter.m_End;
      return *this;
    }

    const IndexType & GetIndex() const
    {
      return m_Index;
    }

    ConstIndexIterator & operator++()
    {
      m_Index[0]++;
      if( m_Index[0] >= m_Iterator->GetIndex()[0] + (OffsetValueType)m_Iterator->GetLength() )
        {
        // we've reached the end of the line - go to the next one
        ++m_Iterator;
        NextValidLine();
        }
      return *this;
    }

    ConstIndexIterator operator++(int)
    {
      ConstIndexIterator tmp = *this;
      ++(*this);
      return tmp;
    }

    bool operator==(const ConstIndexIterator & iter) const
    {
      return m_Index == iter.m_Index && m_Iterator == iter.m_Iterator && m_Begin == iter.m_Begin && m_End == iter.m_End;
    }

    bool operator!=(const ConstIndexIterator & iter) const
    {
      return !( *this == iter );
    }

    void GoToBegin()
    {
      m_Iterator = m_Begin;
      m_Index.Fill(0);
      NextValidLine();
    }

    bool IsAtEnd() const
    {
      return m_Iterator == m_End;
    }

  private:

    using LineContainerType = typename std::deque< LineType >;
    using InternalIteratorType = typename LineContainerType::const_iterator;
    void NextValidLine()
    {
      // search for the next valid position
      while( m_Iterator != m_End && m_Iterator->GetLength() == 0 )
        {
        ++m_Iterator;
        }
      if( m_Iterator != m_End )
        {
        m_Index = m_Iterator->GetIndex();
        }
    }

    InternalIteratorType m_Iterator;
    InternalIteratorType m_Begin;
    InternalIteratorType m_End;
    IndexType            m_Index;
  };

protected:
  LabelObject();
  void PrintSelf(std::ostream & os, Indent indent) const override;

private:
  using LineContainerType = typename std::deque< LineType >;

  LineContainerType m_LineContainer;
  LabelType         m_Label;
};
} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkLabelObject.hxx"
#endif

#endif