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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 itkChildTreeIterator_h
#define itkChildTreeIterator_h
#include "itkTreeIteratorBase.h"
namespace itk
{
template <typename TTreeType>
class ITK_TEMPLATE_EXPORT ChildTreeIterator : public TreeIteratorBase<TTreeType>
{
public:
/** Typedefs */
using Self = ChildTreeIterator;
using Superclass = TreeIteratorBase<TTreeType>;
using TreeType = TTreeType;
using ValueType = typename TTreeType::ValueType;
using typename Superclass::TreeNodeType;
using ChildIdentifier = typename TreeNodeType::ChildIdentifier;
using typename Superclass::NodeType;
/** Constructor */
ChildTreeIterator(TreeType * tree, const TreeNodeType * start = nullptr);
/** Constructor */
ChildTreeIterator(const TreeIteratorBase<TTreeType> & iterator);
/** Get the type of the iterator. */
NodeType
GetType() const override;
/** Go to a specific child node. */
bool
GoToChild(ChildIdentifier number = 0) override;
/** Go to the parent node. */
bool
GoToParent() override;
/** Clone function */
TreeIteratorBase<TTreeType> *
Clone() override;
/** operator = */
Self &
operator=(Superclass & iterator)
{
if (this != &iterator)
{
Superclass::operator=(iterator);
auto & it = static_cast<ChildTreeIterator<TTreeType> &>(iterator);
m_ListPosition = it.m_ListPosition;
m_ParentNode = it.m_ParentNode;
}
return *this;
}
protected:
/** Get the next node. */
const ValueType &
Next() override;
/** Return true if the next node exists. */
bool
HasNext() const override;
private:
mutable ChildIdentifier m_ListPosition{};
TreeNodeType * m_ParentNode{};
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkChildTreeIterator.hxx"
#endif
#endif
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