/**
 * Copyright (c) 2002-2013 "Neo Technology,"
 * Network Engine for Objects in Lund AB [http://neotechnology.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j 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.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.kernel.impl.storemigration;

import java.io.File;
import java.io.IOException;

import org.neo4j.kernel.impl.nioneo.store.NeoStore;
import org.neo4j.kernel.impl.util.FileUtils;

public class StoreFiles
{
    public static final String[] fileNames = {
            NeoStore.DEFAULT_NAME,
            "neostore.nodestore.db",
            "neostore.propertystore.db",
            "neostore.propertystore.db.arrays",
            "neostore.propertystore.db.index",
            "neostore.propertystore.db.index.keys",
            "neostore.propertystore.db.strings",
            "neostore.relationshipstore.db",
            "neostore.relationshiptypestore.db",
            "neostore.relationshiptypestore.db.names",
    };

    /**
     * Moves a database's store files from one directory
     * to another. Since it just renames files (the standard way of moving with
     * JDK6) from and to must be on the same disk partition.
     *
     * @param fromDirectory The directory that hosts the database files.
     * @param toDirectory The directory to move the database files to.
     * @throws IOException If any of the move operations fail for any reason.
     */
    public static void move( File fromDirectory, File toDirectory )
            throws IOException
    {
        // TODO: change the order that files are moved to handle failure conditions properly
        for ( String fileName : fileNames )
        {
            moveFile( fileName, fromDirectory, toDirectory );
            moveFile( fileName + ".id", fromDirectory, toDirectory );
        }
    }

    /**
     * Moves a file from one directory to another, by a rename op.
     *
     * @param fileName The base filename of the file to move, not the complete
     *            path
     * @param fromDirectory The directory currently containing filename
     * @param toDirectory The directory to host filename - must be in the same
     *            disk partition as filename
     * @throws IOException
     */
    static void moveFile( String fileName, File fromDirectory,
            File toDirectory ) throws IOException
    {
        if ( FileUtils.moveFile( new File( fromDirectory, fileName ),
                toDirectory ) == null )
        {
            throw new IOException( "Move of file " + fileName + " from "
                                   + fromDirectory.getAbsolutePath()
                                   + " to directory "
                                   + toDirectory.getAbsolutePath() + " failed" );
        }
    }
}