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

    def execute(self):
        if self.settings["connection"]:
            # remove boundary condition from a connection
            if not self.settings["connection"].AppliedCondition:
                return
            if len(self.file.get_inverse(self.settings["connection"].AppliedCondition)) == 1:
                self.file.remove(self.settings["connection"].AppliedCondition)
            self.settings["connection"].AppliedCondition = None
        else:
            # remove the boundary condition
            for conn in self.file.get_inverse(self.settings["boundary_condition"]):
                conn.AppliedCondition = None
            self.file.remove(self.settings["boundary_condition"])