import javax.swing.filechooser.FileFilter;
import java.io.File;

/**
 * @author TESI
 */
public class TextFilter extends FileFilter {

    // Accept all directories and all txt files.
    public boolean accept(File f)
    {
        if (f.isDirectory()) {
            return true;
        }

        String extension = getExtension(f);
        if (extension != null) {
            return extension.equals("txt");
        }

        return false;
    }

    // The description of this filter
    public String getDescription()
    {
        return "txt files";
    }

    private static String getExtension(File f)
    {
        String ext = null;
        String s = f.getName();
        int i = s.lastIndexOf('.');

        if (i > 0 && i < s.length() - 1) {
            ext = s.substring(i + 1).toLowerCase();
        }
        return ext;
    }
}