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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkPreOrderTreeIterator.h.html,v $ |
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Language: C++ |
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Date: $Date: 2006/01/17 19:15:45 $ |
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Version: $Revision: 1.4 $ |
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Copyright (c) Insight Software Consortium. All rights reserved. |
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See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details. |
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This software is distributed WITHOUT ANY WARRANTY; without even |
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
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PURPOSE. See the above copyright notices for more information. |
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=========================================================================*/ |
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#ifndef __itkPreOrderTreeIterator_h |
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#define __itkPreOrderTreeIterator_h |
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#include <itkTreeIteratorBase.h> |
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NMS |
namespace itk{ |
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template <class TTreeType> |
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class PreOrderTreeIterator : public TreeIteratorBase<TTreeType> |
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{ |
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public: |
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/** Typedefs */ |
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typedef typename TTreeType::ValueType ValueType; |
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TDA |
typedef TreeIteratorBase<TTreeType> Superclass; |
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TDA |
typedef typename Superclass::TreeNodeType TreeNodeType; |
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/** Constructor */ |
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PreOrderTreeIterator( const TTreeType* tree, TreeNodeType* start = NULL ); |
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/** Get the type of the iterator */ |
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int GetType() const; |
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/** Clone function */ |
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TreeIteratorBase<TTreeType>* Clone(); |
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protected: |
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/** Return the next node */ |
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const ValueType& Next(); |
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/** Return true if the next node exists */ |
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bool HasNext() const; |
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private: |
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/** Find the next node */ |
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const TreeNodeType* FindNextNode() const; |
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}; |
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/** Constructor */ |
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template <class TTreeType> |
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LEN |
PreOrderTreeIterator<TTreeType>::PreOrderTreeIterator( const TTreeType* tree, TreeNodeType* start ) |
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IND |
**:TreeIteratorBase<TTreeType>(tree,start) |
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{ |
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} |
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/** Return the type of the iterator */ |
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template <class TTreeType> |
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int |
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PreOrderTreeIterator<TTreeType>::GetType() const |
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{ |
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return TreeIteratorBase<TTreeType>::PREORDER; |
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} |
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/** Return true if the next node exists */ |
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template <class TTreeType> |
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bool |
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PreOrderTreeIterator<TTreeType>::HasNext() const |
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{ |
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if ( const_cast<TreeNodeType* >(FindNextNode()) != NULL ) |
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{ |
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return true; |
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} |
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return false; |
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} |
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/** Return the next node */ |
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template <class TTreeType> |
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const typename PreOrderTreeIterator<TTreeType>::ValueType& |
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PreOrderTreeIterator<TTreeType>::Next() |
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{ |
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this->m_Position = const_cast<TreeNodeType* >(FindNextNode()); |
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return this->m_Position->Get(); |
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} |
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/** Find the next node */ |
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template <class TTreeType> |
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const typename PreOrderTreeIterator<TTreeType>::TreeNodeType* |
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PreOrderTreeIterator<TTreeType>::FindNextNode() const |
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{ |
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if ( this->m_Position == NULL ) |
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{ |
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return NULL; |
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} |
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if ( this->m_Position->HasChildren() ) |
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{ |
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return dynamic_cast<const TreeNodeType*>(this->m_Position->GetChild(0)); |
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} |
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if ( !this->m_Position->HasParent() ) |
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{ |
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return NULL; |
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} |
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TreeNodeType* child = this->m_Position; |
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TreeNodeType* parent = dynamic_cast<TreeNodeType*>(this->m_Position->GetParent()); |
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int childPosition = parent->ChildPosition( child ); |
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int lastChildPosition = parent->CountChildren() - 1; |
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while ( childPosition < lastChildPosition ) |
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{ |
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TreeNodeType* help = dynamic_cast<TreeNodeType*>(parent->GetChild( childPosition + 1 )); |
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if ( help != NULL ) |
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{ |
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return help; |
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} |
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childPosition++; |
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} |
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while ( parent->HasParent() ) |
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{ |
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child = parent; |
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parent = dynamic_cast<TreeNodeType*>(parent->GetParent()); |
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// Subtree |
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if( parent->ChildPosition( this->m_Root ) >= 0 ) |
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{ |
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return NULL; |
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} |
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childPosition = parent->ChildPosition(child); |
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lastChildPosition = parent->CountChildren() - 1; |
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while ( childPosition < lastChildPosition ) |
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{ |
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TreeNodeType* help = dynamic_cast<TreeNodeType*>(parent->GetChild( childPosition + 1 )); |
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if ( help != NULL ) |
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{ |
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return help; |
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} |
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} |
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} |
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return NULL; |
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} |
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/** Clone function */ |
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template <class TTreeType> |
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TreeIteratorBase<TTreeType>* PreOrderTreeIterator<TTreeType>::Clone() |
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{ |
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PreOrderTreeIterator<TTreeType>* clone = new PreOrderTreeIterator<TTreeType>(this-> m_Tree, this->m_Position ); |
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*clone = *this; |
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return clone; |
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} |
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} // end namespace itk |
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#endif |
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