1use crate::tz::{TimeZone, TimeZoneNameIter};
2
3#[derive(Clone)]
4pub(crate) struct Database;
5
6impl Database {
7 pub(crate) fn from_env() -> Database {
8 Database
9 }
10
11 #[cfg(feature = "std")]
12 pub(crate) fn from_dir(
13 dir: &std::path::Path,
14 ) -> Result<Database, crate::Error> {
15 Err(crate::error::err!(
16 "system tzdb unavailable: \
17 crate feature `tzdb-zoneinfo` is disabled, \
18 opening tzdb at {dir} has therefore failed",
19 dir = dir.display(),
20 ))
21 }
22
23 pub(crate) fn none() -> Database {
24 Database
25 }
26
27 pub(crate) fn reset(&self) {}
28
29 pub(crate) fn get(&self, _query: &str) -> Option<TimeZone> {
30 None
31 }
32
33 pub(crate) fn available<'d>(&'d self) -> TimeZoneNameIter<'d> {
34 TimeZoneNameIter::empty()
35 }
36
37 pub(crate) fn is_definitively_empty(&self) -> bool {
38 true
39 }
40}
41
42impl core::fmt::Debug for Database {
43 fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
44 write!(f, "ZoneInfo(unavailable)")
45 }
46}
47