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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 ethcore::snapshot::{ManifestData, RestorationStatus, SnapshotService};

    use util::{Bytes, Mutex};
    use util::hash::H256;

    /// Mocked snapshot service (used for sync info extensions).
    pub struct TestSnapshotService {
    	status: Mutex<RestorationStatus>,
    }

    impl TestSnapshotService {
    	/// Create a test snapshot service. Only the `status` function matters -- it'll
    	/// return `Inactive` by default.
    	pub fn new() -> Self {
    		TestSnapshotService {
    			status: Mutex::new(RestorationStatus::Inactive),
    		}
    	}

    	/// Set the restoration status.
    	pub fn set_status(&self, status: RestorationStatus) {
    		*self.status.lock() = status;
    	}
    }

    impl SnapshotService for TestSnapshotService {
    	fn manifest(&self) -> Option<ManifestData> { None }
    	fn chunk(&self, _hash: H256) -> Option<Bytes> { None }
    	fn status(&self) -> RestorationStatus { self.status.lock().clone() }
    	fn begin_restore(&self, _manifest: ManifestData) { }
    	fn abort_restore(&self) { }
    	fn restore_state_chunk(&self, _hash: H256, _chunk: Bytes) { }
    	fn restore_block_chunk(&self, _hash: H256, _chunk: Bytes) { }
    	fn provide_canon_hashes(&self, _hashes: &[(u64, H256)]) { }
    }

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