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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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 itkLeafTreeIterator_h
#define itkLeafTreeIterator_h
#include "itkPreOrderTreeIterator.h"
namespace itk
{
template <typename TTreeType>
class ITK_TEMPLATE_EXPORT LeafTreeIterator : public TreeIteratorBase<TTreeType>
{
public:
/** Typedefs */
using Self = LeafTreeIterator;
using Superclass = TreeIteratorBase<TTreeType>;
using TreeType = TTreeType;
using ValueType = typename TreeType::ValueType;
using typename Superclass::TreeNodeType;
using typename Superclass::NodeType;
/** Constructor */
LeafTreeIterator(const TreeType * tree);
/** Constructor */
LeafTreeIterator(TreeType * tree);
/** Destructor */
~LeafTreeIterator() override;
/** Return the type of iterator */
NodeType
GetType() const override;
/** Clone function */
TreeIteratorBase<TTreeType> *
Clone() override;
protected:
/** Return the next value */
const ValueType &
Next() override;
/** Return true if the next value exists */
bool
HasNext() const override;
private:
/** Find the next node */
const TreeNodeType *
FindNextNode() const;
};
/** Constructor */
template <typename TTreeType>
LeafTreeIterator<TTreeType>::LeafTreeIterator(const TTreeType * tree)
: TreeIteratorBase<TTreeType>(tree, nullptr)
{
this->m_Begin = const_cast<TreeNodeType *>(this->FindNextNode()); //
//
// Position
// the
//
// iterator
// to
// the
// first
// leaf;
}
/** Constructor */
template <typename TTreeType>
LeafTreeIterator<TTreeType>::LeafTreeIterator(TTreeType * tree)
: TreeIteratorBase<TTreeType>(tree, nullptr)
{
this->m_Begin = const_cast<TreeNodeType *>(this->FindNextNode()); //
//
// Position
// the
//
// iterator
// to
// the
// first
// leaf;
}
/** Destructor */
template <typename TTreeType>
LeafTreeIterator<TTreeType>::~LeafTreeIterator() = default;
/** Return the type of iterator */
template <typename TTreeType>
auto
LeafTreeIterator<TTreeType>::GetType() const -> NodeType
{
return TreeIteratorBaseEnums::TreeIteratorBaseNode::LEAF;
}
/** Return true if the next value exists */
template <typename TTreeType>
bool
LeafTreeIterator<TTreeType>::HasNext() const
{
if (this->m_Position == nullptr)
{
return false;
}
if (const_cast<TreeNodeType *>(FindNextNode()) != nullptr)
{
return true;
}
return false;
}
/** Return the next node */
template <typename TTreeType>
const typename LeafTreeIterator<TTreeType>::ValueType &
LeafTreeIterator<TTreeType>::Next()
{
this->m_Position = const_cast<TreeNodeType *>(FindNextNode());
if (this->m_Position == nullptr)
{
return this->m_Root->Get(); // value irrelevant, but we have to return something
}
return this->m_Position->Get();
}
/** Find the next node given the position */
template <typename TTreeType>
const typename LeafTreeIterator<TTreeType>::TreeNodeType *
LeafTreeIterator<TTreeType>::FindNextNode() const
{
PreOrderTreeIterator<TTreeType> it(this->m_Tree, this->m_Position);
it.m_Root = this->m_Root;
++it; // go next
if (it.IsAtEnd())
{
return nullptr;
}
if (!it.HasChild())
{
return it.GetNode();
}
while (!it.IsAtEnd())
{
if (!it.HasChild())
{
return it.GetNode();
}
++it;
}
return nullptr;
}
/** Clone function */
template <typename TTreeType>
TreeIteratorBase<TTreeType> *
LeafTreeIterator<TTreeType>::Clone()
{
auto * clone = new LeafTreeIterator<TTreeType>(this->m_Tree);
*clone = *this;
return clone;
}
} // end namespace itk
#endif
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