LFileUtils.java :  » Graphic-Library » LaTeXDraw-2.0.8 » latexDraw » util » Java Open Source

package latexDraw.util;

import java.io.*;

/** 
 * Defines some workarounds to deal with the problem of the renameto function.
 * The renameto function cannot rename a file from one filesystem to one other.<br>
 * <br>
 * This file is part of LaTeXDraw<br>
 * Copyright (c) 2005-2009 Arnaud BLOUIN<br>
 *<br>
 *  LaTeXDraw 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.<br>
 *<br>
 *  LaTeXDraw is distributed 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.<br>
 * <br>
 * 09/22/09<br>
 * @author Arnaud BLOUIN<br>
 * @version 2.0.5<br>
 */
public class LFileUtils {
  /** 
   * Copies a file.
   * The renameTo method does not allow action across NFS mounted filesystems
   * this method is the workaround
   * @param fromFile The existing File
   * @param toFile The new File
   * @return  <code>true</code> if and only if the renaming succeeded;
   *          <code>false</code> otherwise
   */
  public final static boolean copy(File fromFile, File toFile) {
    if(fromFile==null || toFile==null)
      return false;
      
    try {
        FileInputStream in         = new FileInputStream(fromFile);
        FileOutputStream out       = new FileOutputStream(toFile);
        BufferedInputStream inBuffer   = new BufferedInputStream(in);
        BufferedOutputStream outBuffer   = new BufferedOutputStream(out);
        int theByte           = 0;

        while ((theByte = inBuffer.read()) > -1) {
          outBuffer.write(theByte);
        }

        outBuffer.close();
        inBuffer.close();
        out.close();
        in.close();

        // cleanup if files are not the same length
        if(fromFile.length() != toFile.length()) {
          toFile.delete();
          return false;
        }
  
        return true;
    }
    catch(IOException e) { return false; }
  }

  /** 
  * Moves a file.
  * The renameTo method does not allow action across NFS mounted filesystems
  * this method is the workaround
  * @param fromFile The existing File
  * @param toFile The new File
  * @return  <code>true</code> if and only if the renaming succeeded;
  *          <code>false</code> otherwise
  */
  public final static boolean move(File fromFile, File toFile) {
    if(fromFile==null || toFile==null)
      return false;
    
      if(fromFile.renameTo(toFile))
        return true;

      // delete if copy was successful, otherwise move will fail
      if(copy(fromFile, toFile))
        return fromFile.delete();

      return false;
  }
}