IfcOpenShell/src/ifcopenshell-python/ifcopenshell/api/structural/add_structural_boundary_condition.py

class Usecase:
    def __init__(self, file, **settings):
        self.file = file
        self.settings = {"connection": None}
        for key, value in settings.items():
            self.settings[key] = value

    def execute(self):
        if self.settings["connection"].is_a("IfcRelConnectsStructuralMember"):
            related_connection = self.settings["connection"].RelatedStructuralConnection
        else:
            related_connection = self.settings["connection"]

        if related_connection.is_a("IfcStructuralPointConnection"):
            boundary_class = "IfcBoundaryNodeCondition"
        elif related_connection.is_a("IfcStructuralCurveConnection"):
            boundary_class = "IfcBoundaryEdgeCondition"
        elif related_connection.is_a("IfcStructuralSurfaceConnection"):
            boundary_class = "IfcBoundaryFaceCondition"

        self.settings["connection"].AppliedCondition = self.file.create_entity(boundary_class)