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    // Copyright 2015-2017 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/>.

    //! Indication of how secure the chain is.

    use header::BlockNumber;

    /// Indication of how secure the chain is.
    #[derive(Debug, PartialEq, Copy, Clone, Hash, Eq)]
    #[cfg_attr(feature = "ipc", binary)]
    pub enum SecurityLevel {
    	/// All blocks from genesis to chain head are known to have valid state transitions and PoW.
    	FullState,
    	/// All blocks from genesis to chain head are known to have a valid PoW.
    	FullProofOfWork,
    	/// Some recent headers (the argument) are known to have a valid PoW.
    	PartialProofOfWork(BlockNumber),
    }

    impl SecurityLevel {
    	/// `true` for `FullPoW`/`FullState`.
    	pub fn is_full(&self) -> bool {
    		match *self {
    			SecurityLevel::FullState | SecurityLevel::FullProofOfWork => true,
    			_ => false,
    		}
    	}
    }

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