Java File Backup saveBackup(File file, int backups, String backupPrefix, String backupSuffix, String backupDirectory)

Description

Saves a backup (optionally numbered) of a file.

License

Open Source License

Parameter

Parameter	Description
file	A local file
backups	The number of backups. Must be >= 1. If > 1, backup files will be numbered.
backupPrefix	The backup file name prefix
backupSuffix	The backup file name suffix
backupDirectory	The directory where to save backups; if null, they will be saved in the same directory as the file itself.

Declaration

public static void saveBackup(File file, int backups,
        String backupPrefix, String backupSuffix, String backupDirectory) 

Method Source Code

//package com.java2s;
/*//  w w w . ja  v  a  2  s  .com
 * MiscUtilities.java - Various miscallaneous utility functions
 * :tabSize=8:indentSize=8:noTabs=false:
 * :folding=explicit:collapseFolds=1:
 *
 * Copyright (C) 1999, 2000, 2001 Slava Pestov
 * Portions copyright (C) 2000 Richard S. Hall
 * Portions copyright (C) 2001 Dirk Moebius
 *
 * This program 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 2
 * of the License, or 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

import java.io.*;

public class Main {
    /**
     * Saves a backup (optionally numbered) of a file.
     * @param file A local file
     * @param backups The number of backups. Must be >= 1. If > 1, backup
     * files will be numbered.
     * @param backupPrefix The backup file name prefix
     * @param backupSuffix The backup file name suffix
     * @param backupDirectory The directory where to save backups; if null,
     * they will be saved in the same directory as the file itself.
     * @since jEdit 4.0pre1
     */
    public static void saveBackup(File file, int backups,
            String backupPrefix, String backupSuffix, String backupDirectory) {
        if (backupPrefix == null)
            backupPrefix = "";
        if (backupSuffix == null)
            backupSuffix = "";

        String name = file.getName();

        // If backups is 1, create ~ file
        if (backups == 1) {
            file.renameTo(new File(backupDirectory, backupPrefix + name
                    + backupSuffix));
        }
        // If backups > 1, move old ~n~ files, create ~1~ file
        else {
            new File(backupDirectory, backupPrefix + name + backupSuffix
                    + backups + backupSuffix).delete();

            for (int i = backups - 1; i > 0; i--) {
                File backup = new File(backupDirectory, backupPrefix + name
                        + backupSuffix + i + backupSuffix);

                backup.renameTo(new File(backupDirectory, backupPrefix
                        + name + backupSuffix + (i + 1) + backupSuffix));
            }

            file.renameTo(new File(backupDirectory, backupPrefix + name
                    + backupSuffix + "1" + backupSuffix));
        }
    }
}