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use super::*;
use std::convert::TryFrom;
use time::Date;
/// Builder for constructing a BSON [`DateTime`]
pub struct DateTimeBuilder<Y = NoYear, M = NoMonth, D = NoDay> {
pub(crate) year: Y,
pub(crate) month: M,
pub(crate) day: D,
pub(crate) hour: Option<u8>,
pub(crate) minute: Option<u8>,
pub(crate) second: Option<u8>,
pub(crate) millisecond: Option<u16>,
}
impl Default for DateTimeBuilder {
fn default() -> Self {
Self {
year: NoYear,
month: NoMonth,
day: NoDay,
hour: None,
minute: None,
second: None,
millisecond: None,
}
}
}
pub struct Year(i32);
pub struct NoYear;
pub struct Month(u8);
pub struct NoMonth;
pub struct Day(u8);
pub struct NoDay;
impl<M, D> DateTimeBuilder<NoYear, M, D> {
/// Sets the year for the builder instance. Years between ±9999 inclusive are valid.
/// If the specified value is out of range, calling the `build()` method will return
/// an error.
///
/// Note: This is a required method. You will not be able to call `build()` before calling
/// this method.
pub fn year(self, y: i32) -> DateTimeBuilder<Year, M, D> {
let Self {
year: _,
month,
day,
hour,
minute,
second,
millisecond,
} = self;
DateTimeBuilder {
year: Year(y),
month,
day,
hour,
minute,
second,
millisecond,
}
}
}
impl<Y, D> DateTimeBuilder<Y, NoMonth, D> {
/// Sets the month for the builder instance. Maps months as 1-January to 12-December.
/// If the specified value is out of range, calling the `build()` method will return
/// an error.
///
/// Note: This is a required method. You will not be able to call `build()` before calling
/// this method.
pub fn month(self, m: u8) -> DateTimeBuilder<Y, Month, D> {
let Self {
year,
month: _,
day,
hour,
minute,
second,
millisecond,
} = self;
DateTimeBuilder {
year,
month: Month(m),
day,
hour,
minute,
second,
millisecond,
}
}
}
impl<Y, M> DateTimeBuilder<Y, M, NoDay> {
/// Sets the day for the builder instance. Values in the range `1..=31` are valid.
/// If the specified value does not exist for the provided month/year or is out of range,
/// calling the `build()` method will return an error.
///
/// Note: This is a required method. You will not be able to call `build()` before calling
/// this method.
pub fn day(self, d: u8) -> DateTimeBuilder<Y, M, Day> {
let Self {
year,
month,
day: _,
hour,
minute,
second,
millisecond,
} = self;
DateTimeBuilder {
year,
month,
day: Day(d),
hour,
minute,
second,
millisecond,
}
}
}
impl<Y, M, D> DateTimeBuilder<Y, M, D> {
/// Sets the hour (24-hour format) for the builder instance. Values must be in the range
/// `0..=23`. If the specified value is out of range, calling the `build()` method will
/// return an error.
///
/// Note: This is an optional method. The hour will default to 0 if not explicitly set.
pub fn hour(mut self, hour: u8) -> DateTimeBuilder<Y, M, D> {
self.hour = Some(hour);
self
}
/// Sets the minute for the builder instance. Values must be in the range `0..=59`.
/// If the specified value is out of range, calling the `build()` method will return an error.
///
/// Note: This is an optional method. The minute will default to 0 if not explicitly set.
pub fn minute(mut self, minute: u8) -> DateTimeBuilder<Y, M, D> {
self.minute = Some(minute);
self
}
/// Sets the second for the builder instance. Values must be in range `0..=59`.
/// If the specified value is out of range, calling the `build()` method will return an error.
///
/// Note: This is an optional method. The second will default to 0 if not explicitly set.
pub fn second(mut self, second: u8) -> DateTimeBuilder<Y, M, D> {
self.second = Some(second);
self
}
/// Sets the millisecond for the builder instance. Values must be in the range `0..=999`.
/// If the specified value is out of range, calling the `build()` method will return an error.
///
/// Note: This is an optional method. The millisecond will default to 0 if not explicitly set.
pub fn millisecond(mut self, millisecond: u16) -> DateTimeBuilder<Y, M, D> {
self.millisecond = Some(millisecond);
self
}
}
impl DateTimeBuilder<Year, Month, Day> {
/// Convert a builder with a specified year, month, day, and optionally, an hour, minute, second
/// and millisecond to a [`DateTime`].
///
/// Note: You cannot call `build()` before setting at least the year, month and day.
pub fn build(self) -> Result<DateTime> {
let err = |e: time::error::ComponentRange| Error::InvalidTimestamp {
message: e.to_string(),
};
let month = time::Month::try_from(self.month.0).map_err(err)?;
let dt = Date::from_calendar_date(self.year.0, month, self.day.0)
.map_err(err)?
.with_hms_milli(
self.hour.unwrap_or(0),
self.minute.unwrap_or(0),
self.second.unwrap_or(0),
self.millisecond.unwrap_or(0),
)
.map_err(err)?;
Ok(DateTime::from_time_private(dt.assume_utc()))
}
}