imag/libimagcounter/src/error.rs

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use std::error::Error;
use std::fmt::Error as FmtError;
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use std::fmt::{Display, Formatter};
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/**
* Kind of error
*/
#[derive(Clone, Copy, Debug, PartialEq)]
pub enum CounterErrorKind {
StoreReadError,
StoreWriteError,
HeaderTypeError,
HeaderFieldMissingError,
}
fn counter_error_type_as_str(e: &CounterErrorKind) -> &'static str {
match *e {
CounterErrorKind::StoreReadError => "Store read error",
CounterErrorKind::StoreWriteError => "Store write error",
CounterErrorKind::HeaderTypeError => "Header type error",
CounterErrorKind::HeaderFieldMissingError => "Header field missing error",
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}
}
impl Display for CounterErrorKind {
fn fmt(&self, fmt: &mut Formatter) -> Result<(), FmtError> {
try!(write!(fmt, "{}", counter_error_type_as_str(self)));
Ok(())
}
}
/**
* Store error type
*/
#[derive(Debug)]
pub struct CounterError {
err_type: CounterErrorKind,
cause: Option<Box<Error>>,
}
impl CounterError {
/**
* Build a new CounterError from an CounterErrorKind, optionally with cause
*/
pub fn new(errtype: CounterErrorKind, cause: Option<Box<Error>>)
-> CounterError
{
CounterError {
err_type: errtype,
cause: cause,
}
}
/**
* Get the error type of this CounterError
*/
pub fn err_type(&self) -> CounterErrorKind {
self.err_type
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}
}
impl Display for CounterError {
fn fmt(&self, fmt: &mut Formatter) -> Result<(), FmtError> {
try!(write!(fmt, "[{}]", counter_error_type_as_str(&self.err_type)));
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Ok(())
}
}
impl Error for CounterError {
fn description(&self) -> &str {
counter_error_type_as_str(&self.err_type)
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}
fn cause(&self) -> Option<&Error> {
self.cause.as_ref().map(|e| &**e)
}
}