/**
 * @(#)TXTFilter.java	11/03/05
 * 
 * Copyright 2005 3GP01, KCL.  All unmodified code is copyright of its respective owner.
 * 
 * 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.
 *
 * The GNU General Public Licence should be contained within licence.txt;
 * if not, write to the Free Software Foundation, Inc., 51 Franklin Street,
 * Fifth Floor, Boston, MA  02110-1301, USA.
 */

import java.io.File;

/**
 * This class provides a filter to Load dialogs so that only .txt files can be loaded.
 * This is useful for loading custom dictionaries so that we can restrict the user's
 * choice of files.
 * 
 * @author 3GP01 - Hardev Bhamra, Deepak Chandarana, James Tompkin
 * @version 2.0
 * @see Dictionary
 */

public class TXTFilter extends javax.swing.filechooser.FileFilter 
{
  public boolean accept(File f) 
  {
    //if it is a directory -- we want to show it so return true.
    if (f.isDirectory()) 
      return true;
  
    //get the extension of the file

    String extension = getExtension(f);
    //check to see if the extension is equal to 'txt'
    if (extension.equals("txt"))
    return true; 

    return false;
  }
    
  public String getDescription() 
  {
      return "'.txt' files";
  }

  private String getExtension(File f) 
  {
    String s = f.getName();
    int i = s.lastIndexOf('.');
    if (i > 0 &&  i < s.length() - 1) 
      return s.substring(i+1).toLowerCase();
    return "";
  }
}