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Combining Validators

A special validator, CompositeValidator, exists so that many validators can be combined together. This then requires that each validator is satisfied for the input value to be accepted.

A composite validator can be constructed by:

def PyInit(self):
    validation = CompositeValidator()
    validation.add(WorkspaceUnitValidator("Wavelength"))
    validation.add(InstrumentValidator())

    # or create validator from list
    # validation = CompositeValidator([
    #                  WorkspaceUnitValidator("Wavelength"),
    #                  InstrumentValidator()
    #              ])
    self.declareProperty(WorkspaceProperty("InputWorkspace",
                                           "",
                                           Direction.Input,
                                           validation))