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/*=========================================================================
Program: Visualization Toolkit
Module: vtkViewNodeFactory.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkViewNodeFactory.h"
#include "vtkObjectFactory.h"
#include "vtkViewNode.h"
#include <map>
#include <string>
//============================================================================
VTK_ABI_NAMESPACE_BEGIN
class vtkViewNodeFactory::vtkInternals
{
public:
std::map<std::string, vtkViewNode* (*)()> Overrides;
vtkInternals() = default;
~vtkInternals() { this->Overrides.clear(); }
};
//============================================================================
vtkStandardNewMacro(vtkViewNodeFactory);
//------------------------------------------------------------------------------
vtkViewNodeFactory::vtkViewNodeFactory()
{
this->Internals = new vtkInternals;
}
//------------------------------------------------------------------------------
vtkViewNodeFactory::~vtkViewNodeFactory()
{
delete this->Internals;
}
//------------------------------------------------------------------------------
void vtkViewNodeFactory::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
//------------------------------------------------------------------------------
vtkViewNode* vtkViewNodeFactory::CreateNode(vtkObject* who)
{
if (!who)
{
return nullptr;
}
vtkViewNode* (*func)() = nullptr;
// First, check if there is an exact match for override functions for this
// object type.
{
auto fnOverrideIt = this->Internals->Overrides.find(who->GetClassName());
if (fnOverrideIt != this->Internals->Overrides.end())
{
func = fnOverrideIt->second;
}
}
// Next, check if there is an indirect match (one of the parents of this
// object type has an override). If there is more than one override for
// types in this object's hierarchy, choose the most derived one.
if (func == nullptr)
{
vtkIdType closest = VTK_ID_MAX;
for (auto it = this->Internals->Overrides.begin(); it != this->Internals->Overrides.end(); ++it)
{
vtkIdType numberOfGenerations = who->GetNumberOfGenerationsFromBase(it->first.c_str());
if (numberOfGenerations >= 0 && numberOfGenerations < closest)
{
closest = numberOfGenerations;
func = it->second;
}
}
}
// If neither are available, do not create a node for this object.
if (func == nullptr)
{
return nullptr;
}
// Otherwise, create a node and initialize it.
vtkViewNode* vn = func();
vn->SetMyFactory(this);
if (vn)
{
vn->SetRenderable(who);
}
return vn;
}
//------------------------------------------------------------------------------
void vtkViewNodeFactory::RegisterOverride(const char* name, vtkViewNode* (*func)())
{
this->Internals->Overrides[name] = func;
}
VTK_ABI_NAMESPACE_END
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