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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/>.

    //! This migration consolidates all databases into single one using Column Families.

    use rlp::{Rlp, RlpStream, View, Stream};
    use util::kvdb::Database;
    use util::migration::{Batch, Config, Error, Migration, Progress};
    use std::sync::Arc;

    /// Which part of block to preserve
    pub enum Extract {
    	/// Extract block header RLP.
    	Header,
    	/// Extract block body RLP.
    	Body,
    	/// Don't change the value.
    	All,
    }

    /// Consolidation of extras/block/state databases into single one.
    pub struct ToV9 {
    	progress: Progress,
    	column: Option<u32>,
    	extract: Extract,
    }

    impl ToV9 {
    	/// Creates new V9 migration and assigns all `(key,value)` pairs from `source` DB to given Column Family
    	pub fn new(column: Option<u32>, extract: Extract) -> Self {
    		ToV9 {
    			progress: Progress::default(),
    			column: column,
    			extract: extract,
    		}
    	}
    }

    impl Migration for ToV9 {

    	fn columns(&self) -> Option<u32> { Some(5) }

    	fn version(&self) -> u32 { 9 }

    	fn migrate(&mut self, source: Arc<Database>, config: &Config, dest: &mut Database, col: Option<u32>) -> Result<(), Error> {
    		let mut batch = Batch::new(config, self.column);

    		for (key, value) in source.iter(col) {
    			self.progress.tick();
    			match self.extract {
    				Extract::Header => {
    					batch.insert(key.to_vec(), Rlp::new(&value).at(0).as_raw().to_vec(), dest)?
    				},
    				Extract::Body => {
    					let mut body = RlpStream::new_list(2);
    					let block_rlp = Rlp::new(&value);
    					body.append_raw(block_rlp.at(1).as_raw(), 1);
    					body.append_raw(block_rlp.at(2).as_raw(), 1);
    					batch.insert(key.to_vec(), body.out(), dest)?
    				},
    				Extract::All => {
    					batch.insert(key.to_vec(), value.to_vec(), dest)?
    				}
    			}
    		}

    		batch.commit(dest)
    	}
    }

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