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pub type UnixTimestamp = i64;

pub struct TimeBounds {
    lower: Option<UnixTimestamp>,
    upper: Option<UnixTimestamp>,
}

impl TimeBounds {
    pub fn new(lower: Option<UnixTimestamp>, upper: Option<UnixTimestamp>) -> TimeBounds {
        TimeBounds {
            lower: lower,
            upper: upper,
        }
    }

    pub fn lower(&self) -> &Option<UnixTimestamp> {
        &self.lower
    }

    pub fn upper(&self) -> &Option<UnixTimestamp> {
        &self.upper
    }
}