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itkChildTreeIterator.h

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00001 /*=========================================================================
00002 
00003   Program:   Insight Segmentation & Registration Toolkit
00004   Module:    $RCSfile: itkChildTreeIterator.h,v $
00005   Language:  C++
00006   Date:      $Date: 2008-01-28 13:52:55 $
00007   Version:   $Revision: 1.8 $
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 __itkChildTreeIterator_h
00018 #define __itkChildTreeIterator_h
00019 
00020 #include <itkTreeIteratorBase.h>
00021 
00022 
00023 namespace itk
00024 {
00025 
00026 template <class TTreeType>
00027 class ChildTreeIterator : public TreeIteratorBase<TTreeType> 
00028 {
00029 public:
00030   
00032   typedef ChildTreeIterator                 Self;
00033   typedef TreeIteratorBase<TTreeType>       Superclass;
00034   typedef TTreeType                         TreeType;
00035   typedef typename TTreeType::ValueType     ValueType;
00036   typedef typename Superclass::TreeNodeType TreeNodeType;
00037 
00039   ChildTreeIterator( TreeType* tree,const  TreeNodeType* start=NULL );
00040 
00042   ChildTreeIterator( const TreeIteratorBase<TTreeType>& iterator );
00043 
00045   int GetType( ) const;
00046 
00048   virtual bool GoToChild( int number = 0 );
00049 
00051   virtual bool GoToParent();
00052 
00054   TreeIteratorBase<TTreeType>* Clone();
00055 
00057   Self& operator=(Superclass& iterator) 
00058     {
00059     Superclass::operator=(iterator);
00060     ChildTreeIterator<TTreeType>& it = 
00061                         static_cast<ChildTreeIterator<TTreeType>&>(iterator);
00062     m_ListPosition = it.m_ListPosition;
00063     m_ParentNode = it.m_ParentNode;
00064     return *this;
00065     }
00067 
00068 protected:
00069 
00071   const ValueType& Next();
00072 
00074   bool HasNext() const;
00075 
00076 private:
00077 
00078   mutable int          m_ListPosition;
00079   TreeNode<ValueType>* m_ParentNode;
00080 };
00081 
00083 template <class TTreeType>
00084 ChildTreeIterator<TTreeType>::ChildTreeIterator(TTreeType* tree, 
00085                                                 const TreeNodeType* start)  
00086   :TreeIteratorBase<TTreeType>(tree, start)
00087 {
00088   m_ListPosition = 0;
00089   m_ParentNode = this->m_Position;
00090   this->m_Position = m_ParentNode->GetChild( m_ListPosition );
00091   this->m_Begin = this->m_Position;
00092 }
00094 
00095 template <class TTreeType>
00096 ChildTreeIterator<TTreeType>::ChildTreeIterator(
00097                                   const TreeIteratorBase<TTreeType>& iterator)
00098   :TreeIteratorBase<TTreeType>(iterator.GetTree(), iterator.GetNode())
00099 {
00100   m_ListPosition = 0;
00101   m_ParentNode = this->m_Position;
00102   this->m_Position = m_ParentNode->GetChild( m_ListPosition );
00103 }
00104 
00106 template <class TTreeType>
00107 bool 
00108 ChildTreeIterator<TTreeType>::GoToChild(int number)
00109 {
00110   if ( m_ParentNode->GetChild( number ) == NULL )
00111     {
00112     return false;
00113     }
00114 
00115   m_ListPosition = 0;
00116   m_ParentNode = m_ParentNode->GetChild( number );
00117   this->m_Position = m_ParentNode->GetChild( m_ListPosition );
00118   this->m_Begin = this->m_Position;
00119   return true;
00120 }
00121 
00123 template <class TTreeType>
00124 bool 
00125 ChildTreeIterator<TTreeType>::GoToParent()
00126 {
00127   TreeNode<ValueType>* parent =  m_ParentNode->GetParent();
00128 
00129   if ( parent == NULL )
00130     {
00131     return false;
00132     }
00133 
00134   m_ListPosition = 0;
00135   m_ParentNode = parent;
00136   this->m_Position = m_ParentNode->GetChild( m_ListPosition );
00137   this->m_Begin = this->m_Position;
00138   return true;
00139 }
00140 
00142 template <class TTreeType>
00143 int 
00144 ChildTreeIterator<TTreeType>::GetType() const
00145 {
00146   return TreeIteratorBase<TTreeType>::CHILD;
00147 }
00148 
00150 template <class TTreeType>
00151 bool 
00152 ChildTreeIterator<TTreeType>::HasNext() const
00153 {
00154   if( m_ListPosition < m_ParentNode->CountChildren() - 1 )
00155     {
00156     return true;
00157     }
00158   else
00159     {
00160     return false;
00161     }
00162 }
00164 
00166 template <class TTreeType>
00167 const typename ChildTreeIterator<TTreeType>::ValueType&
00168 ChildTreeIterator<TTreeType>::Next() 
00169 {
00170   m_ListPosition++;
00171   this->m_Position = m_ParentNode->GetChild( m_ListPosition );
00172   return this->m_Position->Get();
00173 }
00175 
00177 template <class TTreeType>
00178 TreeIteratorBase<TTreeType>* ChildTreeIterator<TTreeType>::Clone() 
00179 {
00180   ChildTreeIterator<TTreeType>* clone = new ChildTreeIterator<TTreeType>( 
00181                     const_cast<TTreeType*>(this->m_Tree),this->m_Position );   
00182   *clone = *this;
00183   return clone;
00184 }
00186 
00187 } // end namespace itk
00188 
00189 #endif
00190 

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