p50x 0.1.0

P50X protocol communication library and command-line utility
Documentation 
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/*
 * File: error.rs
 * Date: 04.05.2020
 * Author: MarkAtk
 *
 * MIT License
 *
 * Copyright (c) 2020 MarkAtk
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

use std::error::Error as StdError;
use std::fmt::{self, Display, Formatter};
use std::convert::From;
use serial_unit_testing::error::Error as SerialError;

use super::reply::P50XReply;

pub type Result<T> = std::result::Result<T, Error>;

#[derive(Debug)]
pub enum Error {
    UnknownDevice,
    Serial(SerialError),
    UnknownResponse(String),
    Reply(P50XReply),
    Other
}


impl Display for Error {
    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
        match *self {
            Error::UnknownDevice => write!(f, "Unknown device"),
            Error::Serial(ref cause) => write!(f, "Serial Error: {}", cause.to_string()),
            Error::UnknownResponse(ref cause) => write!(f, "Unknown response: {}", cause),
            Error::Reply(ref cause) => write!(f, "P50X Reply: {:?}", cause),
            Error::Other => write!(f, "Unknown error")
        }
    }
}

impl StdError for Error {
    fn description(&self) -> &str {
        match *self {
            Error::UnknownDevice => "Unknown analyzer device",
            Error::Serial(ref cause) => cause.description(),
            Error::UnknownResponse(_) => "Unkonwn response",
            Error::Reply(_) => "P50X Reply",
            Error::Other => "Unknown error"
        }
    }

    fn cause(&self) -> Option<&dyn StdError> {
        match *self {
            Error::Serial(ref cause) => Some(cause),
            _ => None
        }
    }
}

impl From<SerialError> for Error {
    fn from(cause: SerialError) -> Error {
        Error::Serial(cause)
    }
}

impl From<P50XReply> for Error {
    fn from(cause: P50XReply) -> Error {
        Error::Reply(cause)
    }
}