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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/>.

    use std::collections::BTreeMap;
    use util::Address;
    use builtin::Builtin;
    use engines::Engine;
    use spec::CommonParams;
    use evm::Schedule;
    use env_info::EnvInfo;

    /// An engine which does not provide any consensus mechanism and does not seal blocks.
    pub struct NullEngine {
    	params: CommonParams,
    	builtins: BTreeMap<Address, Builtin>,
    }

    impl NullEngine {
    	/// Returns new instance of NullEngine with default VM Factory
    	pub fn new(params: CommonParams, builtins: BTreeMap<Address, Builtin>) -> Self {
    		NullEngine{
    			params: params,
    			builtins: builtins,
    		}
    	}
    }

    impl Default for NullEngine {
    	fn default() -> Self {
    		Self::new(Default::default(), Default::default())
    	}
    }

    impl Engine for NullEngine {
    	fn name(&self) -> &str {
    		"NullEngine"
    	}

    	fn params(&self) -> &CommonParams {
    		&self.params
    	}

    	fn builtins(&self) -> &BTreeMap<Address, Builtin> {
    		&self.builtins
    	}

    	fn schedule(&self, _env_info: &EnvInfo) -> Schedule {
    		Schedule::new_homestead()
    	}
    }

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