1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38

use std::fmt;
use std::error::Error as StdError;

#[derive(Debug, Eq, PartialEq)]
pub enum Error {
    MissingRequired(&'static str),
    ContentType(&'static str),
    Html(&'static str),
    AtomReadError,
}

impl StdError for Error {
    fn description(&self) -> &str {
        match *self {
            Error::MissingRequired(ref err) => err,
            Error::ContentType(ref err) => err,
            Error::Html(ref err) => err,
            Error::AtomReadError => "atom read error",
        }
    }

    fn cause(&self) -> Option<&StdError> {
        match *self {
            _ => None,
        }
    }
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match *self {
            Error::MissingRequired(ref err) => fmt::Display::fmt(err, f),
            Error::ContentType(ref err) => fmt::Display::fmt(err, f),
            Error::Html(ref err) => fmt::Display::fmt(err, f),
            Error::AtomReadError => fmt::Display::fmt("atom read error", f),
        }
    }
}