Creates a file, making sure that its name is unique. : File Name « File Input Output « Java

1. Java
2. File Input Output
3. File Name

Creates a file, making sure that its name is unique.

        
/* Copyright (C) 2003 Univ. of Massachusetts Amherst, Computer Science Dept.
   This file is part of "MALLET" (MAchine Learning for LanguagE Toolkit).
   http://www.cs.umass.edu/~mccallum/mallet
   This software is provided under the terms of the Common Public License,
   version 1.0, as published by http://www.opensource.org.  For further
   information, see the file `LICENSE' included with this distribution. */

//package cc.mallet.util;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.Serializable;

/**
 * 
 * 
 * @author <a href="mailto:casutton@cs.umass.edu">Charles Sutton</a>
 * @version $Id: ArrayUtils.java,v 1.1 2007/10/22 21:37:40 mccallum Exp $
 */
public class Util {

  /**
   * Creates a file, making sure that its name is unique.
   *  The file will be created as if by <tt>new File(dir, prefix+i+extension)</tt>,
   *  where i is an integer chosen such that the returned File does not exist.
   * @param dir Directory to use for the returned file
   * @param prefix Prefix of the file name (before the uniquifying integer)
   * @param extension Suffix of the file name (after the uniquifying integer)
   */
  public static File uniqueFile (File dir, String prefix, String extension)
    throws IOException
  {
    File f = null;
    int i = 0;
    boolean wasCreated = false;
    while (!wasCreated) {
      if (dir != null) {
        f = new File (dir, prefix+i+extension);
      } else {
        f = new File (prefix+i+extension);
      }
      wasCreated = f.createNewFile ();
      i++;
    }
    return f;
  }

}

   
    
    
    
    
    
    
    
  

Related examples in the same category