Executes the stream's tool over the given time interval

        :param stream: the stream reference
        :param interval: the time interval
        :return: None

def execute_tool(self, stream, interval):
        """
        Executes the stream's tool over the given time interval

        :param stream: the stream reference
        :param interval: the time interval
        :return: None
        """
        if interval.end > self.up_to_timestamp:
            raise ValueError(
                'The stream is not available after ' + str(self.up_to_timestamp) + ' and cannot be calculated')

        required_intervals = TimeIntervals([interval]) - stream.calculated_intervals
        if not required_intervals.is_empty:
            for interval in required_intervals:
                stream.tool.execute(stream.input_streams, stream, interval)
                stream.calculated_intervals += interval

            if not stream.required_intervals.is_empty:
                raise RuntimeError('Tool execution did not cover the specified time interval.')