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from paraview.util.vtkAlgorithm import *
@smproxy.filter(name="MyPreserveInput")
@smproperty.input(name="Input")
@smdomain.datatype(dataTypes=["vtkDataSet"], composite_data_supported=False)
class PreserveInputTypeFilter(VTKPythonAlgorithmBase):
"""
Example filter demonstrating how to write a filter that preserves the input
dataset type.
"""
def __init__(self):
super().__init__(nInputPorts=1, nOutputPorts=1, outputType="vtkDataSet")
def RequestDataObject(self, request, inInfo, outInfo):
inData = self.GetInputData(inInfo, 0, 0)
outData = self.GetOutputData(outInfo, 0)
assert inData is not None
if outData is None or (not outData.IsA(inData.GetClassName())):
outData = inData.NewInstance()
outInfo.GetInformationObject(0).Set(outData.DATA_OBJECT(), outData)
return super().RequestDataObject(request, inInfo, outInfo)
def RequestData(self, request, inInfo, outInfo):
inData = self.GetInputData(inInfo, 0, 0)
outData = self.GetOutputData(outInfo, 0)
print("input type =", inData.GetClassName())
print("output type =", outData.GetClassName())
assert outData.IsA(inData.GetClassName())
return 1
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