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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef itkLevelOrderTreeIterator_h
#define itkLevelOrderTreeIterator_h
#include <queue>
#include <climits>
#include "itkTreeIteratorBase.h"
namespace itk
{
/**
* \class LevelOrderTreeIterator
* \brief Iterate over a tree in level order.
*
* \ingroup ITKCommon
*/
template< typename TTreeType >
class ITK_TEMPLATE_EXPORT LevelOrderTreeIterator:public TreeIteratorBase< TTreeType >
{
public:
/** Typedefs */
typedef LevelOrderTreeIterator Self;
typedef TreeIteratorBase< TTreeType > Superclass;
typedef TTreeType TreeType;
typedef typename TTreeType::ValueType ValueType;
typedef typename Superclass::TreeNodeType TreeNodeType;
typedef typename Superclass::NodeType NodeType;
/** Constructor with end level specification */
LevelOrderTreeIterator(TreeType *tree, int endLevel = INT_MAX, const TreeNodeType *start = ITK_NULLPTR);
/** Constructor with end level specification */
LevelOrderTreeIterator(TreeType *tree, int startLevel, int endLevel, const TreeNodeType *start = ITK_NULLPTR);
virtual ~LevelOrderTreeIterator() {}
/** Get the type of the iterator */
NodeType GetType() const;
/** Get the start level */
int GetStartLevel() const;
/** Get the end level */
int GetEndLevel() const;
/** Get the current level */
int GetLevel() const;
/** Clone function */
TreeIteratorBase< TTreeType > * Clone();
/** operator = */
const Self & operator=(const Self & iterator)
{
if(this != &iterator)
{
this->Superclass::operator=(iterator);
m_StartLevel = iterator.m_StartLevel;
m_EndLevel = iterator.m_EndLevel;
m_Queue = iterator.m_Queue;
}
return *this;
}
protected:
/** Return the next node */
const ValueType & Next();
/** Return true if the next node exists */
bool HasNext() const;
private:
const TreeNodeType * FindNextNode() const;
const TreeNodeType * FindNextNodeHelp() const;
int GetLevel(const TreeNodeType *node) const;
int m_StartLevel;
int m_EndLevel;
mutable std::queue< const TreeNodeType * > m_Queue;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkLevelOrderTreeIterator.hxx"
#endif
#endif
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