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// Copyright 2019 Parity Technologies (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/>. //! Errors that can occur when working with IndexedDB. use std::fmt; /// An error that occurred when working with IndexedDB. #[derive(Clone, PartialEq, Debug)] pub enum Error { /// Accessing a Window has failed. /// Are we in a WebWorker? WindowNotAvailable, /// IndexedDB is not supported by your browser. NotSupported(String), /// This enum may grow additional variants, /// so this makes sure clients don't count on exhaustive matching. /// (Otherwise, adding a new variant could break existing code.) #[doc(hidden)] __Nonexhaustive, } impl std::error::Error for Error { fn description(&self) -> &str { match *self { Error::WindowNotAvailable => "Accessing a Window has failed", Error::NotSupported(_) => "IndexedDB is not supported by your browser", Error::__Nonexhaustive => unreachable!(), } } } impl fmt::Display for Error { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { match *self { Error::WindowNotAvailable => write!(f, "Accessing a Window has failed"), Error::NotSupported(ref err) => write!(f, "IndexedDB is not supported by your browser: {}", err,), Error::__Nonexhaustive => unreachable!(), } } }