hierarchiciterator.hh

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// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_ALBERTA_HIERARCHICITERATOR_HH
#define DUNE_ALBERTA_HIERARCHICITERATOR_HH
 
#include <dune/grid/albertagrid/elementinfo.hh>
#include <dune/grid/common/entityiterator.hh>
 
#if HAVE_ALBERTA
 
namespace Dune
{
 
  // AlbertaGridHierarchicIterator
  // -----------------------------
 
  template< class GridImp >
  class AlbertaGridHierarchicIterator
  {
    typedef AlbertaGridHierarchicIterator< GridImp > This;
 
  public:
    typedef typename GridImp::template Codim<0>::Entity Entity;
    typedef typename GridImp::ctype ctype;
 
    typedef MakeableInterfaceObject< Entity > EntityObject;
    typedef typename EntityObject::ImplementationType EntityImp;
 
    typedef typename EntityImp::ElementInfo ElementInfo;
 
    AlbertaGridHierarchicIterator ()
    {}
 
    AlbertaGridHierarchicIterator ( const GridImp &grid,
                                    const ElementInfo &elementInfo,
                                    int maxLevel );
 
    AlbertaGridHierarchicIterator ( const GridImp &grid, int actLevel, int maxLevel );
 
    AlbertaGridHierarchicIterator ( const This &other );
 
    This &operator= ( const This &other );
 
    void increment();
 
    bool equals ( const This &other ) const
    {
      return entity_.impl().equals( other.entity_.impl() );
    }
 
    Entity &dereference () const
    {
      return entity_;
    }
 
    int level () const
    {
      return entity_.impl().level();
    }
 
  protected:
    const GridImp &grid () const
    {
      return entity_.impl().grid();
    }
 
  private:
    void increment ( ElementInfo elementInfo );
 
    mutable  Entity entity_;
 
    // level on which the iterator was started
    int startLevel_;
 
    // maximal level to go down to
    int maxlevel_;
  };
 
 
  template< class GridImp >
  inline AlbertaGridHierarchicIterator< GridImp >
  ::AlbertaGridHierarchicIterator( const GridImp &grid, int actLevel, int maxLevel )
    : entity_( EntityImp( grid ) ),
      startLevel_( actLevel ),
      maxlevel_( maxLevel )
  {}
 
 
  template< class GridImp >
  inline AlbertaGridHierarchicIterator< GridImp >
  ::AlbertaGridHierarchicIterator ( const GridImp &grid,
                                    const ElementInfo &elementInfo,
                                    int maxLevel )
    : entity_( EntityImp( grid ) ),
      startLevel_( elementInfo.level() ),
      maxlevel_( maxLevel )
  {
    increment( elementInfo );
  }
 
 
  template< class GridImp >
  inline AlbertaGridHierarchicIterator< GridImp >
  ::AlbertaGridHierarchicIterator( const This &other )
    : entity_( other.entity_ ),
      startLevel_( other.startLevel_ ),
      maxlevel_( other.maxlevel_ )
  {}
 
 
  template< class GridImp >
  inline typename AlbertaGridHierarchicIterator< GridImp >::This &
  AlbertaGridHierarchicIterator< GridImp >::operator= ( const This &other )
  {
    entity_ = other.entity_;
    startLevel_ = other.startLevel_;
    maxlevel_ = other.maxlevel_;
    return *this;
  }
 
 
  template< class GridImp >
  inline void AlbertaGridHierarchicIterator< GridImp >::increment ()
  {
    increment( entity_.impl().elementInfo() );
  }
 
  template< class GridImp >
  inline void AlbertaGridHierarchicIterator< GridImp >
  ::increment ( ElementInfo elementInfo )
  {
    assert( !elementInfo == false );
    if( (elementInfo.level() >= maxlevel_) || elementInfo.isLeaf() )
    {
      while( (elementInfo.level() > startLevel_) && (elementInfo.indexInFather() == 1) )
        elementInfo = elementInfo.father();
      if( elementInfo.level() > startLevel_ )
        entity_.impl().setElement( elementInfo.father().child( 1 ), 0 );
      else
        entity_.impl().clearElement();
    }
    else
      entity_.impl().setElement( elementInfo.child( 0 ), 0 );
  }
 
}
 
#endif // #if HAVE_ALBERTA
 
#endif // #ifndef DUNE_ALBERTA_HIERARCHICITERATOR_HH