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"""Test ghost object support in VTK-Python
When PyVTKObject is destroyed, the vtkObjectBase that it
contained often continues to exist because references to
it still exist within VTK. When that vtkObjectBase is
returned to python, a new PyVTKObject is created.
If the PyVTKObject has a custom class or a custom dict,
then we make a "ghost" of the PyVTKObject when it is
destroyed, so that if its vtkObjectBase returns to python,
the PyVTKObject can be restored with the proper class and
dict. Each ghost has a weak pointer to its vtkObjectBase
so that it can be erased if the vtkObjectBase is destroyed.
To be tested:
- make sure custom dicts are restored
- make sure custom classes are restored
Created on Aug 19, 2010 by David Gobbi
"""
import sys
import exceptions
import vtk
from vtk.test import Testing
class vtkCustomObject(vtk.vtkObject):
pass
class TestGhost(Testing.vtkTest):
def testGhostForDict(self):
"""Ghost an object to save the dict"""
o = vtk.vtkObject()
o.customattr = 'hello'
a = vtk.vtkVariantArray()
a.InsertNextValue(o)
i = id(o)
del o
o = vtk.vtkObject()
o = a.GetValue(0).ToVTKObject()
# make sure the id has changed, but dict the same
self.assertEqual(o.customattr, 'hello')
self.assertNotEqual(i, id(o))
def testGhostForClass(self):
"""Ghost an object to save the class"""
o = vtkCustomObject()
a = vtk.vtkVariantArray()
a.InsertNextValue(o)
i = id(o)
del o
o = vtk.vtkObject()
o = a.GetValue(0).ToVTKObject()
# make sure the id has changed, but class the same
self.assertEqual(o.__class__, vtkCustomObject)
self.assertNotEqual(i, id(o))
if __name__ == "__main__":
Testing.main([(TestGhost, 'test')])
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