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use std;
use std::error;
use std::fmt;
#[derive(Debug)]
pub enum CellError {
Generic(GenericError),
FromUtf8(std::string::FromUtf8Error),
ParseInt(std::num::ParseIntError),
}
impl CellError {
pub fn generic(message: &str) -> CellError {
CellError::Generic(GenericError::new(message))
}
}
impl From<std::string::FromUtf8Error> for CellError {
fn from(err: std::string::FromUtf8Error) -> CellError {
CellError::FromUtf8(err)
}
}
impl From<std::num::ParseIntError> for CellError {
fn from(err: std::num::ParseIntError) -> CellError {
CellError::ParseInt(err)
}
}
impl fmt::Display for CellError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
CellError::Generic(ref err) => write!(f, "{}", err),
CellError::FromUtf8(ref err) => write!(f, "{}", err),
CellError::ParseInt(ref err) => write!(f, "{}", err),
}
}
}
impl error::Error for CellError {
fn description(&self) -> &str {
match *self {
CellError::Generic(ref err) => err.description(),
CellError::FromUtf8(ref err) => err.description(),
CellError::ParseInt(ref err) => err.description(),
}
}
fn cause(&self) -> Option<&error::Error> {
match *self {
CellError::Generic(ref err) => Some(err),
CellError::FromUtf8(ref err) => Some(err),
CellError::ParseInt(ref err) => Some(err),
}
}
}
#[derive(Debug)]
pub struct GenericError {
message: String,
}
impl GenericError {
pub fn new(message: &str) -> GenericError {
GenericError {
message: String::from(message),
}
}
}
impl<'a> fmt::Display for GenericError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "Store error: {}", self.message)
}
}
impl<'a> error::Error for GenericError {
fn description(&self) -> &str {
self.message.as_str()
}
fn cause(&self) -> Option<&error::Error> {
None
}
}