imag/libimagstore/src/error.rs

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use std::error::Error;
use std::fmt::Display;
use std::fmt::Formatter;
use std::fmt::Error as FmtError;
use std::clone::Clone;
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#[derive(Clone, Copy, Debug)]
pub enum StoreErrorKind {
FileError,
IdLocked,
IdNotFound,
OutOfMemory,
// maybe more
}
fn store_error_type_as_str(e: &StoreErrorKind) -> &'static str {
match e {
&StoreErrorKind::FileError => "File Error",
&StoreErrorKind::IdLocked => "ID locked",
&StoreErrorKind::IdNotFound => "ID not found",
&StoreErrorKind::OutOfMemory => "Out of Memory",
}
}
impl Display for StoreErrorKind {
fn fmt(&self, fmt: &mut Formatter) -> Result<(), FmtError> {
try!(write!(fmt, "{}", store_error_type_as_str(self)));
Ok(())
}
}
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#[derive(Debug)]
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pub struct StoreError {
err_type: StoreErrorKind,
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cause: Option<Box<Error>>,
}
impl StoreError {
pub fn new(errtype: StoreErrorKind, cause: Option<Box<Error>>)
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-> StoreError
{
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StoreError {
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err_type: errtype,
cause: cause,
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}
}
pub fn err_type(&self) -> StoreErrorKind {
self.err_type.clone()
}
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}
impl Display for StoreError {
fn fmt(&self, fmt: &mut Formatter) -> Result<(), FmtError> {
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try!(write!(fmt, "[{}]", store_error_type_as_str(&self.err_type.clone())));
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Ok(())
}
}
impl Error for StoreError {
fn description(&self) -> &str {
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store_error_type_as_str(&self.err_type.clone())
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}
fn cause(&self) -> Option<&Error> {
self.cause.as_ref().map(|e| &**e)
}
}