openethereum/ethstore/src/json/version.rs

// Copyright 2015, 2016 Ethcore (UK) Ltd.
// This file is part of Parity.

// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Parity.  If not, see <http://www.gnu.org/licenses/>.

use serde::{Serialize, Serializer, Deserialize, Deserializer, Error as SerdeError};
use serde::de::Visitor;
use super::Error;

#[derive(Debug, PartialEq)]
pub enum Version {
	V3,
}

impl Serialize for Version {
	fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error> 
	where S: Serializer {
		match *self {
			Version::V3 => serializer.serialize_u64(3)
		}
	}
}

impl Deserialize for Version {
	fn deserialize<D>(deserializer: &mut D) -> Result<Version, D::Error>
	where D: Deserializer {
		deserializer.deserialize(VersionVisitor)
	}
}

struct VersionVisitor;

impl Visitor for VersionVisitor {
	type Value = Version;

	fn visit_u64<E>(&mut self, value: u64) -> Result<Self::Value, E> where E: SerdeError {
		match value {
			3 => Ok(Version::V3),
			_ => Err(SerdeError::custom(Error::UnsupportedVersion))
		}
	}
}