diagonalIterator.h

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#ifndef BALL_LINALG_DIAGONALITERATOR_H
#define BALL_LINALG_DIAGONALITERATOR_H

#ifndef BALL_LINALG_MATRIX_IH
# include <BALL/MATHS/LINALG/matrix.ih>
#endif

#ifndef BALL_LINALG_VECTOR_IH
# include <BALL/MATHS/vector.ih>
#endif

#ifndef BALL_CONCEPT_RANDOMACCESSITERATOR_H
#include <BALL/CONCEPT/randomAccessIterator.h>
#endif

namespace BALL {

  // forward declaration
  template <class valuetype, class mtraits>
  class Matrix;

  
  template <class valuetype, class mtraits=StandardTraits>
  class DiagonalIteratorTraits
  {
    typedef valuetype ValueType;

    typedef valuetype* PointerType;

    typedef int IteratorPosition;

    typedef int Distance;

    typedef int Index;

      friend class Matrix<valuetype, mtraits>;
    public:

      virtual ~DiagonalIteratorTraits()
      {
      }

      DiagonalIteratorTraits()
        : bound_(0),
          position_(0),
          vector_(0)
      {
      }
      
      DiagonalIteratorTraits(const Matrix<valuetype, mtraits>& matrix)
        : bound_(const_cast<Matrix<valuetype, mtraits>*>(&matrix)),
          position_(0),
          vector_(bound_->m_)
      {
      }
      
      DiagonalIteratorTraits(const DiagonalIteratorTraits& traits)
        : bound_(traits.bound_),
          position_(traits.position_),
          vector_(bound_->m_)
      {
      }
      
      DiagonalIteratorTraits& operator = (const DiagonalIteratorTraits& traits)
      {
        bound_ = traits.bound_;
        position_ = traits.position_;
        vector_ = traits.vector_;
    
        return *this;
      }

      Matrix<valuetype, mtraits>* getContainer()
      {
        return bound_;
      }
      
      const Matrix<valuetype, mtraits>* getContainer() const
      {
        return bound_;
      }
      
      bool isSingular() const
      {
        return (bound_ == 0);
      }
      
      IteratorPosition& getPosition()
      {
        return position_;
      }

      const IteratorPosition& getPosition() const
      {
        return position_;
      }

      bool operator == (const DiagonalIteratorTraits& traits) const
      {
        return (position_ == traits.position_);
      }

      bool operator != (const DiagonalIteratorTraits& traits) const
      {
        return (position_ != traits.position_);
      }
        
      bool operator < (const DiagonalIteratorTraits& traits) const
      {
        if (bound_->row_major_)
        {
          return (((position_ / bound_->m_) > (traits.position_ / traits.bound_->m_)) &&
            ((position_ % bound_->m_) < (traits.position_ % traits.bound_->m_)));
        }
        else
        {
          return (((position_ % bound_->n_) > (traits.position_ % traits.bound_->n_)) &&
            ((position_ / bound_->n_) < (traits.position_ / traits.bound_->n_)));
        }
      }

      Distance getDistance(const DiagonalIteratorTraits& traits) const
      {
        return (Distance)(position_ - traits.position_);
      }
      
      bool isValid() const
      {
        return ((bound_ != 0) && (position_ >= 0) && (position_ < (int)bound_->data_.size()));
      }

      void invalidate()
      {
        bound_ = 0;
        position_ = -1;
      }
      
      void toBegin()
      {
        if (bound_->row_major_)
        {
          position_ = bound_->data_.size() - bound_->m_;
        }
        else
        {
          position_ = (bound_->n_ - 1);
        }
      }

      bool isBegin() const
      {
        if (bound_->row_major_)
        {
          return (position_ == (int)(bound_->data_.size() - bound_->m_));
        }
        else
        {
          return (position_ == (int)(bound_->n_ - 1));
        }
      }

      void toEnd()
      {
        if (bound_->row_major_)
        {
          position_ = bound_->m_;
        }
        else
        {
          position_ = bound_->data_.size();
        }
      }
      
      bool isEnd() const
      {
        if (bound_->row_major_)
        {
          return (position_ == (int)bound_->m_);
        }
        else
        {
          return (position_ == (int)bound_->data_.size());
        }
      }
      
      Vector<valuetype>& getData()
      {

        if (bound_->row_major_)
        {
          // calculate the size of the current diagonalvector
          uint vector_size = std::min(bound_->n_-(position_ / bound_->m_), bound_->m_-(position_ % bound_->m_));
          vector_.resize(vector_size);
          uint i = 0;
          for (uint j = 0; j < vector_size; j++)
          {
            vector_[j]=(*bound_)[position_+i];
            i+=bound_->m_+1;
          }
        }
        else
        {
          // calculate the size of the current diagonalvector
          uint vector_size = std::min(bound_->n_-(position_ % bound_->n_), bound_->m_-(position_ / bound_->n_));
          vector_.resize(vector_size);
          uint j = 0;
          for (uint i = 0; position_+i < bound_->data_.size(); i+=bound_->n_)
          {
            vector_[j++]=(*bound_)[position_+i];
            i++;
          }
        }

        return vector_;
      }

      const Vector<valuetype>& getData() const
      {
        if (bound_->row_major_)
        {

          // calculate the size of the current diagonalvector
          uint vector_size = std::min(bound_->n_-(position_ / bound_->m_), bound_->m_-(position_ % bound_->m_));
          vector_.resize(vector_size);
          uint i = 0;
          for (uint j = 0; j < vector_size; j++)
          {
            vector_[j]=(*bound_)[position_+i];
            i+=bound_->m_+1;
          }
        }
        else
        {
          // calculate the size of the current diagonalvector
          uint vector_size = std::min(bound_->n_-(position_ % bound_->n_), bound_->m_-(position_ / bound_->n_));
          vector_.resize(vector_size);
          uint j = 0;
          for (uint i = 0; position_+i < bound_->data_.size(); i+=bound_->n_)
          {
            vector_[j++]=(*bound_)[position_+i];
            i++;
          }
        }

        return vector_;

      }

      void forward()
      {
        int i,j;
        if (bound_->row_major_)
        {
          i = position_ / bound_->m_;
          j = position_ % bound_->m_;
        }
        else
        {
          i = position_ % bound_->n_;
          j = position_ / bound_->n_;
        }

        if (i != 0)
        {
          i--;
        } else
        {
          j++;
        }
        if (bound_->row_major_)
        {
          position_ = j + bound_->m_*i;
        }
        else
        {
          position_ = i + bound_->n_*j;
        }
      }

      friend std::ostream& operator << (std::ostream& s, const DiagonalIteratorTraits& traits)
      {
        return (s << traits.position_ << ' ');
      }
      
      void dump(std::ostream& s) const
      {
        s << position_ << std::endl;
      }
      
      void toRBegin()
      {
        if (bound_->row_major_)
        {
          position_ = (bound_->m_ - 1);
        }
        else
        {
          position_ = bound_->data_.size() - bound_->n_;
        }
      }
      
      bool isRBegin() const
      {
        if (bound_->row_major_)
        {
          return (position_ == (int)(bound_->m_ - 1));
        }
        else
        {
          return (position_ == (int)(bound_->data_.size() - bound_->n_));
        }
      }
      
      void toREnd()
      {
        if (bound_->row_major_)
        {
          position_ = bound_->data_.size();
        }
        else
        {
          position_ = bound_->n_;
        }
      }

      bool isREnd() const
      {
        if (bound_->row_major_)
        {
          return (position_ == (int)bound_->data_.size());
        }
        else
        {
          return  (position_ == (int)bound_->n_);
        }
      }
      
      void backward()
      {

        int i,j;
        if (bound_->row_major_)
        {
          if (position_ == (int)bound_->m_)
          {
            position_--;
            return;
          }
          i = position_ / bound_->m_;
          j = position_ % bound_->m_;
        }
        else
        {
          i = position_ % bound_->n_;
          j = position_ / bound_->n_;
        }
        if (j != 0)
        {
          j--;
        } else
        {
          i++;
        }
        if (bound_->row_major_)
        {
          position_ = j + bound_->m_*i;
        }
        else
        {
          position_ = i + bound_->n_*j;
        }

      }

      void backward(Distance distance)
      {
        int i,j;
        if (bound_->row_major_)
        {
          if (position_ == (int)bound_->m_)
          {
            position_--;
            distance--;
          }
          i = position_ / bound_->m_;
          j = position_ % bound_->m_;
        }
        else
        {
          i = position_ % bound_->n_;
          j = position_ / bound_->n_;
        }

        if (j-distance >= 0)
        {
          j-=distance;
        } else
        {
          j = 0;
          i += (distance - j);
        }
        if (bound_->row_major_)
        {
          position_ = j + bound_->m_*i;
        }
        else
        {
          position_ = i + bound_->n_*j;
        }
      }

      void forward(Distance distance)
      {
        
        int i,j;
        if (bound_->row_major_)
        {
          i = position_ / bound_->m_;
          j = position_ % bound_->m_;
        }
        else
        {
          i = position_ % bound_->n_;
          j = position_ / bound_->n_;
        }

        if (i-distance >= 0)
        {
          i-=distance;
        } else
        {
          i = 0;
          j += (distance - i);
        }
        if (bound_->row_major_)
        {
          position_ = j + bound_->m_*i;
        }
        else
        {
          position_ = i + bound_->n_*j;
        }
      }
      
      Vector<valuetype>& getData(Index index)
      {
        int i = bound_->n_ - 1;
        int j = 0;
        int position;

        if (i-index >= 0)
        {
          i-=index;
        } else
        {
          i = 0;
          j += (index - i);
        }
        if (bound_->row_major_)
        {
          position = j + bound_->m_*i;
        }
        else
        {
          position = i + bound_->n_*j;
        }
        if (bound_->row_major_)
        {
          // calculate the size of the current diagonalvector
          uint vector_size = std::min(bound_->n_-(position / bound_->m_), bound_->m_-(position % bound_->m_));
          vector_.resize(vector_size);
          uint i = 0;
          for (uint j = 0; j < vector_size; j++)
          {
            vector_[j]=(*bound_)[position+i];
            i+=bound_->m_+1;
          }
        }
        else
        {
          // calculate the size of the current diagonalvector
          uint vector_size = std::min(bound_->n_-(position % bound_->n_), bound_->m_-(position / bound_->n_));
          vector_.resize(vector_size);
          uint j = 0;
          for (uint i = 0; i < bound_->data_.size(); i+=bound_->n_)
          {
            vector_[j++]=(*bound_)[position+i];
            i++;
          }
        }
        
        return vector_;
      }
      
      const Vector<valuetype>& getData(Index index) const
      {
        int i = bound_->n_ - 1;
        int j = 0;
        int position;

        if (i-index >= 0)
        {
          i-=index;
        } else
        {
          i = 0;
          j += (index - i);
        }
        if (bound_->row_major_)
        {
          position = j + bound_->m_*i;
        }
        else
        {
          position = i + bound_->n_*j;
        }
        if (bound_->row_major_)
        {
          // calculate the size of the current diagonalvector
          uint vector_size = std::min(bound_->n_-(position / bound_->m_), bound_->m_-(position % bound_->m_));
          vector_.resize(vector_size);
          uint i = 0;
          for (uint j = 0; j < vector_size; j++)
          {
            vector_[j]=(*bound_)[position+i];
            i+=bound_->m_+1;
          }
        }
        else
        {
          // calculate the size of the current diagonalvector
          uint vector_size = std::min(bound_->n_-(position % bound_->n_), bound_->m_-(position / bound_->n_));
          vector_.resize(vector_size);
          uint j = 0;
          for (uint i = 0; i < bound_->data_.size(); i+=bound_->n_)
          {
            vector_[j++]=(*bound_)[position+i];
            i++;
          }
        }
        return vector_;
      }
      

      protected:

      Matrix<valuetype, mtraits>*   bound_;
      IteratorPosition    position_;
      mutable Vector<valuetype>           vector_;
    };


} // namespace BALL

#endif

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