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use std::error;
use std::fmt;
use std::io;
use std::result;
use std::string;
use serde::ser;
#[derive(Debug)]
pub enum Error {
Extern(Box<error::Error>),
Unsupported(String),
Custom(String),
}
pub type Result<T> = result::Result<T, Error>;
impl Error {
pub fn unsupported<T: fmt::Display>(msg: T) -> Self {
Error::Unsupported(format!("{}", msg))
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
Error::Extern(ref err) => fmt::Display::fmt(err, f),
Error::Unsupported(ref msg) | Error::Custom(ref msg) => fmt::Display::fmt(msg, f),
}
}
}
impl error::Error for Error {
fn description(&self) -> &str {
match *self {
Error::Extern(ref err) => err.description(),
Error::Unsupported(_) => "Unsupported error",
Error::Custom(_) => "Param error",
}
}
fn cause(&self) -> Option<&error::Error> {
match *self {
Error::Extern(ref err) => err.cause(),
_ => None,
}
}
}
impl ser::Error for Error {
fn custom<T: fmt::Display>(msg: T) -> Error {
Error::Custom(format!("{}", msg))
}
}
impl From<io::Error> for Error {
fn from(err: io::Error) -> Self {
Error::Extern(Box::new(err))
}
}
impl From<string::FromUtf8Error> for Error {
fn from(err: string::FromUtf8Error) -> Self {
Error::Extern(Box::new(err))
}
}