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use std::{self, io, fmt};
use std::convert::From;
use protobuf;
pub type Result<T> = std::result::Result<T, Error>;
#[derive(Debug)]
pub enum Error {
Io(io::Error),
Pbf(protobuf::ProtobufError),
UnsupportedData,
InvalidData,
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
Error::Io(ref e) => write!(f, "Io({})", e),
Error::Pbf(ref e) => write!(f, "Pbf({})", e),
Error::UnsupportedData => write!(f, "UnsupportedData"),
Error::InvalidData => write!(f, "InvalidData"),
}
}
}
impl std::error::Error for Error {
fn description(&self) -> &str {
match *self {
Error::Io(ref e) => e.description(),
Error::Pbf(ref e) => e.description(),
Error::UnsupportedData => "Unsupported data",
Error::InvalidData => "Invalid data",
}
}
fn cause(&self) -> Option<&std::error::Error> {
match *self {
Error::Io(ref e) => Some(e),
Error::Pbf(ref e) => Some(e),
Error::UnsupportedData => None,
Error::InvalidData => None,
}
}
}
impl From<io::Error> for Error {
fn from(err: io::Error) -> Error {
Error::Io(err)
}
}
impl From<protobuf::ProtobufError> for Error {
fn from(err: protobuf::ProtobufError) -> Error {
Error::Pbf(err)
}
}