/*
 * File    : FileBackup.java
 * Created : 14-nov-2002 15:23
 * By      : fbusquets
 *
 * JClic - Authoring and playing system for educational activities
 *
 * Copyright (C) 2000 - 2005 Francesc Busquets & Departament
 * d'Educacio de la Generalitat de Catalunya                                        
 *
 * 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
 * (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 (see the LICENSE file).
 */

package edu.xtec.jclic.fileSystem;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

/**
 *
 * @author Francesc Busquets (fbusquets@xtec.cat)
 */
public class FileBackup {
    
    File file;
    File backup;
    List<File> createdDirs;
    static final String BAK_EXT=".bak";
    
    /** Creates a new instance of FileBackup */
    public FileBackup(File file) throws java.io.IOException{
        this.file=file;
        if(file.exists() && file.isFile()){
            backup=new File(file.getAbsolutePath()+BAK_EXT);
            if(backup.exists())
                backup.delete();
            file.renameTo(backup);
        }
        else if(!file.exists() && file.getParentFile()!=null && !file.getParentFile().exists()){
            File f=file.getParentFile();
            createdDirs=new ArrayList<File>(2);
            while(f!=null && !f.exists()){
                createdDirs.add(f);
                f=f.getParentFile();
            }
            file.getParentFile().mkdirs();
        }            
    }
    
    public void rollback() throws java.io.IOException{
        if(backup!=null){
            if(file.exists())
                file.delete();
            backup.renameTo(file);
            backup=null;
        }
        else{
            file.delete();
            file=null;
            if(createdDirs!=null){
                for(int i=0; i<createdDirs.size(); i++){
                    File f=createdDirs.get(i);
                    if(f.isDirectory())
                        f.delete();
                }
                createdDirs=null;
            }
        }
    }
    
    public void cleanup() throws java.io.IOException{
        if(backup!=null){
            backup.delete();
            backup=null;
        }
    }
    
    /** Getter for property file.
     * @return Value of property file.
     */
    public java.io.File getFile() {
        return file;
    }
    
    /** Getter for property backup.
     * @return Value of property backup.
     */
    public java.io.File getBackup() {
        return backup;
    }
    
}