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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/>.

    /// Validator lists.

    mod simple_list;
    mod safe_contract;
    mod contract;

    use std::sync::Weak;
    use util::{Address, Arc};
    use ethjson::spec::ValidatorSet as ValidatorSpec;
    use client::Client;
    use self::simple_list::SimpleList;
    use self::contract::ValidatorContract;
    use self::safe_contract::ValidatorSafeContract;

    /// Creates a validator set from spec.
    pub fn new_validator_set(spec: ValidatorSpec) -> Box<ValidatorSet + Send + Sync> {
    	match spec {
    		ValidatorSpec::List(list) => Box::new(SimpleList::new(list.into_iter().map(Into::into).collect())),
    		ValidatorSpec::SafeContract(address) => Box::new(Arc::new(ValidatorSafeContract::new(address.into()))),
    		ValidatorSpec::Contract(address) => Box::new(Arc::new(ValidatorContract::new(address.into()))),
    	}
    }

    pub trait ValidatorSet {
    	/// Checks if a given address is a validator.
    	fn contains(&self, address: &Address) -> bool;
    	/// Draws an validator nonce modulo number of validators.
    	fn get(&self, nonce: usize) -> Address;
    	/// Returns the current number of validators.
    	fn count(&self) -> usize;
    	/// Notifies about malicious behaviour.
    	fn report_malicious(&self, _validator: &Address) {}
    	/// Notifies about benign misbehaviour.
    	fn report_benign(&self, _validator: &Address) {}
    	/// Allows blockchain state access.
    	fn register_contract(&self, _client: Weak<Client>) {}
    }

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