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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-FileCopyrightText: Copyright 2008 Sandia Corporation
// SPDX-License-Identifier: LicenseRef-BSD-3-Clause-Sandia-USGov
/**
* @class vtkDirectedAcyclicGraph
* @brief A rooted tree data structure.
*
*
* vtkDirectedAcyclicGraph is a connected directed graph with no cycles. A tree is a type of
* directed graph, so works with all graph algorithms.
*
* vtkDirectedAcyclicGraph is a read-only data structure.
* To construct a tree, create an instance of vtkMutableDirectedGraph.
* Add vertices and edges with AddVertex() and AddEdge(). You may alternately
* start by adding a single vertex as the root then call graph->AddChild(parent)
* which adds a new vertex and connects the parent to the child.
* The tree MUST have all edges in the proper direction, from parent to child.
* After building the tree, call tree->CheckedShallowCopy(graph) to copy the
* structure into a vtkDirectedAcyclicGraph. This method will return false if the graph is
* an invalid tree.
*
* vtkDirectedAcyclicGraph provides some convenience methods for obtaining the parent and
* children of a vertex, for finding the root, and determining if a vertex
* is a leaf (a vertex with no children).
*
* @sa
* vtkDirectedGraph vtkMutableDirectedGraph vtkGraph
*/
#ifndef vtkDirectedAcyclicGraph_h
#define vtkDirectedAcyclicGraph_h
#include "vtkCommonDataModelModule.h" // For export macro
#include "vtkDirectedGraph.h"
VTK_ABI_NAMESPACE_BEGIN
class vtkIdTypeArray;
class VTKCOMMONDATAMODEL_EXPORT vtkDirectedAcyclicGraph : public vtkDirectedGraph
{
public:
static vtkDirectedAcyclicGraph* New();
vtkTypeMacro(vtkDirectedAcyclicGraph, vtkDirectedGraph);
void PrintSelf(ostream& os, vtkIndent indent) override;
/**
* Return what type of dataset this is.
*/
int GetDataObjectType() VTK_FUTURE_CONST override { return VTK_DIRECTED_ACYCLIC_GRAPH; }
///@{
/**
* Retrieve a graph from an information vector.
*/
static vtkDirectedAcyclicGraph* GetData(vtkInformation* info);
static vtkDirectedAcyclicGraph* GetData(vtkInformationVector* v, int i = 0);
///@}
protected:
vtkDirectedAcyclicGraph();
~vtkDirectedAcyclicGraph() override;
/**
* Check the storage, and accept it if it is a valid
* tree.
*/
bool IsStructureValid(vtkGraph* g) override;
private:
vtkDirectedAcyclicGraph(const vtkDirectedAcyclicGraph&) = delete;
void operator=(const vtkDirectedAcyclicGraph&) = delete;
};
VTK_ABI_NAMESPACE_END
#endif
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