matthiasbeyer/imag
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better error-handling when reading the unit

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This commit is contained in:
Kai Sickeler 2016-07-18 18:53:54 +02:00
parent 769512ada2
commit 3445908ef9
1 changed files with 17 additions and 6 deletions
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21
libimagcounter/src/counter.rs
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@ -16,6 +16,7 @@ use module_path::ModuleEntryPath;
use result::Result;
use error::CounterError as CE;
use error::CounterErrorKind as CEK;
use error::error::MapErrInto;
pub type CounterName = String;
@ -84,6 +85,7 @@ impl<'a> Counter<'a> {
let mut header = self.fle.deref_mut().get_header_mut();
let setres = header.set("counter.unit", Value::String(u.0));
if setres.is_err() {
self.unit = None;
return Err(CE::new(CEK::StoreWriteError, Some(Box::new(setres.unwrap_err()))));
}
};
@ -152,12 +154,17 @@ impl<'a> Counter<'a> {
})
}
pub fn unit(&self) -> Option<CounterUnit> {
pub fn unit(&self) -> Option<&CounterUnit> {
self.unit.as_ref()
}
pub fn read_unit(&self) -> Result<Option<CounterUnit>> {
self.fle.get_header().read("counter.unit")
.ok()
.map_err_into(CEK::StoreReadError)
.and_then(|s| match s {
Some(Value::String(s)) => Some(CounterUnit::new(s)),
_ => None,
Some(Value::String(s)) => Ok(Some(CounterUnit::new(s))),
Some(_) => Err(CE::new(CEK::HeaderTypeError, None)),
None => Ok(None),
})
}
@ -193,8 +200,12 @@ impl<'a> FromStoreId for Counter<'a> {
Err(e) => Err(CE::new(CEK::StoreReadError, Some(Box::new(e)))),
Ok(c) => {
let mut counter = Counter { fle: c, unit: None };
counter.unit = counter.unit();
counter.read_unit()
.map_err_into(CEK::StoreReadError)
.and_then(|u| {
counter.unit = u;
Ok(counter)
})
}
}
}