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itkLeafTreeIterator.h

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00001 /*=========================================================================
00002 
00003   Program:   Insight Segmentation & Registration Toolkit
00004   Module:    $RCSfile: itkLeafTreeIterator.h,v $
00005   Language:  C++
00006   Date:      $Date: 2009-02-05 19:05:00 $
00007   Version:   $Revision: 1.6 $
00008 
00009   Copyright (c) Insight Software Consortium. All rights reserved.
00010   See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
00011 
00012      This software is distributed WITHOUT ANY WARRANTY; without even 
00013      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
00014      PURPOSE.  See the above copyright notices for more information.
00015 
00016 =========================================================================*/
00017 #ifndef __itkLeafTreeIterator_h
00018 #define __itkLeafTreeIterator_h
00019 
00020 #include <itkTreeIteratorBase.h>
00021 #include <itkPreOrderTreeIterator.h>
00022 
00023 namespace itk {
00024 
00025 template <class TTreeType>
00026 class LeafTreeIterator : public TreeIteratorBase<TTreeType> 
00027 {
00028 public:
00029 
00031   typedef LeafTreeIterator                Self;
00032   typedef TreeIteratorBase<TTreeType>     Superclass;
00033   typedef TTreeType                       TreeType;
00034   typedef typename TreeType::ValueType    ValueType;
00035   typedef TreeNode<ValueType>             TreeNodeType;
00036 
00038   LeafTreeIterator( const TreeType* tree );
00039 
00041   LeafTreeIterator( TreeType* tree );
00042 
00044   virtual ~LeafTreeIterator();
00045 
00047   int GetType() const;
00048 
00050   TreeIteratorBase<TTreeType>* Clone();
00051 
00052 protected:
00053   
00055   const ValueType& Next();
00056 
00058   bool HasNext() const;
00059 
00060 private:
00061 
00063   const TreeNodeType* FindNextNode() const;
00064 
00065 };
00066 
00068 template <class TTreeType>
00069 LeafTreeIterator<TTreeType>::LeafTreeIterator(  const TTreeType* tree ) 
00070   :TreeIteratorBase<TTreeType>(tree,NULL)
00071 {
00072   this->m_Begin = const_cast<TreeNodeType* >(this->FindNextNode()); // Position the iterator to the first leaf;
00073 }
00074 
00076 template <class TTreeType>
00077 LeafTreeIterator<TTreeType>::LeafTreeIterator( TTreeType* tree ) 
00078   :TreeIteratorBase<TTreeType>(tree,NULL)
00079 {
00080   this->m_Begin = const_cast<TreeNodeType* >(this->FindNextNode()); // Position the iterator to the first leaf;
00081 }
00082 
00084 template <class TTreeType>
00085 LeafTreeIterator<TTreeType>::~LeafTreeIterator() 
00086 {
00087 }
00088 
00090 template <class TTreeType>
00091 int LeafTreeIterator<TTreeType>::GetType() const 
00092 {
00093   return TreeIteratorBase<TTreeType>::LEAF;
00094 }
00095 
00097 template <class TTreeType>
00098 bool LeafTreeIterator<TTreeType>::HasNext() const
00099 {
00100   if(this->m_Position == NULL)
00101     {
00102     return false;
00103     }
00104   if ( const_cast<TreeNodeType* >(FindNextNode()) != NULL )
00105     {
00106     return true;
00107     }
00108   return false;
00109 }
00111 
00113 template <class TTreeType>
00114 const typename LeafTreeIterator<TTreeType>::ValueType&
00115 LeafTreeIterator<TTreeType>::Next() 
00116 {
00117   this->m_Position = const_cast<TreeNodeType* >(FindNextNode());
00118   return this->m_Position->Get();
00119 }
00121 
00123 template <class TTreeType>
00124 const typename LeafTreeIterator<TTreeType>::TreeNodeType* 
00125 LeafTreeIterator<TTreeType>::FindNextNode() const 
00126 {
00127   PreOrderTreeIterator<TTreeType> it(this->m_Tree,this->m_Position); 
00128   ++it; // go next
00129   if(it.IsAtEnd())
00130     {
00131     return NULL;
00132     }
00134 
00135   if(!it.HasChild())
00136     {
00137     return it.GetNode();
00138     }
00139 
00140   while( !it.IsAtEnd() )
00141     {
00142     if(!it.HasChild())
00143       {
00144       return it.GetNode();
00145       }
00146     ++it;
00147     }
00148   
00149   return NULL;
00150 }
00151 
00153 template <class TTreeType>
00154 TreeIteratorBase<TTreeType>* LeafTreeIterator<TTreeType>::Clone() 
00155 {
00156   LeafTreeIterator<TTreeType>* clone = new LeafTreeIterator<TTreeType>( this->m_Tree );
00157   *clone = *this;
00158   return clone;
00159 }
00161 
00162 } // end namespace itk
00163 
00164 #endif
00165 

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