/**
 * 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.FilenameFilter;
import java.io.IOException;

public class LogFiles
{
    private static final class LogicalLogFilenameFilter implements
            FilenameFilter
    {
        private static final String[] logFilenamePatterns = { "active_tx_log",
                "nioneo_logical\\.log.*", /* covers current log, active log marker
                                            and backups */
                "tm_tx_log\\..*" };

        @Override
        public boolean accept( File dir, String name )
        {
            for ( String pattern : logFilenamePatterns )
            {
                if ( name.matches( pattern ) )
                {
                    return true;
                }
            }
            return false;
        }
    }

    /**
     * Moves all logical logs of a database 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 filename The base filename for the logical logs
     * @param fromDirectory The directory that hosts the database and its logs
     * @param toDirectory The directory to move the log files to
     * @throws IOException If any of the move operations fail for any reason.
     */
    public static void move( File fromDirectory,
            File toDirectory ) throws IOException
    {
        assert fromDirectory.isDirectory();
        assert toDirectory.isDirectory();

        for ( String logFile : fromDirectory.list( new LogicalLogFilenameFilter() ) )
        {
            StoreFiles.moveFile( logFile, fromDirectory, toDirectory );
        }
    }
}