//  FilecopyCommand.java  Copyright (c) 2006 Kari Laitinen

//  http://www.naturalprogramming.com

//  2006-02-16   File created.
//  2006-02-16   Last modification.

//  A solution to Exercise 14-2.


import java.util.* ;
import java.io.* ;    //  Classes for file handling.

class FilecopyCommand
{
   static void copy_file( String  name_of_file_to_be_copied,
                          String  name_of_new_duplicate_file )
   {
      try
      {
         BufferedReader file_to_be_copied  =  new BufferedReader(
                         new FileReader( name_of_file_to_be_copied ) ) ;

         PrintWriter new_duplicate_file  =  new PrintWriter(
                         new FileWriter( name_of_new_duplicate_file ) ) ;

         System.out.print( "\n Copying in progress ... \n" ) ;

         int  text_line_counter  =  0 ;
         boolean  end_of_input_file_encountered  =  false ;

         while ( end_of_input_file_encountered  ==  false )
         {
            String text_line_from_file  =  file_to_be_copied.readLine() ;

            if ( text_line_from_file  ==  null )
            {
               end_of_input_file_encountered  =  true ;
            }
            else
            {
               new_duplicate_file.println( text_line_from_file ) ;

               text_line_counter  ++  ;
            }
         }

         System.out.print( "\n Copying ready. " + text_line_counter
                        +  " lines were copied. \n" ) ;
         file_to_be_copied.close() ;
         new_duplicate_file.close() ;
      }
      catch ( FileNotFoundException  caught_file_not_found_exception )
      {
         System.out.print( "\n\n  File \"" + name_of_file_to_be_copied
                           + "\" not found.\n" ) ;
      }
      catch ( IOException  caught_io_exception )
      {
         System.out.print( "\n\n  File error. Probably cannot write to \""
                           +  name_of_file_to_be_copied + "\".\n" ) ;
      }
   }

   public static void main( String[] command_line_parameters )
   {
      Scanner keyboard = new Scanner( System.in ) ;

      if ( command_line_parameters.length  ==  2 )
      {
         copy_file ( command_line_parameters[ 0 ],
                     command_line_parameters[ 1 ] ) ;
      }
      else
      {
         System.out.print( "\n This program copies text from one file"
                         + "\n to another file. Please, give the name of"
                         + "\n the file to be copied: " ) ;

         String  name_of_file_to_be_copied  =  keyboard.nextLine() ;

         System.out.print( "\n Give the name of the duplicate file: " ) ;

         String  name_of_new_duplicate_file  =  keyboard.nextLine() ;

         copy_file( name_of_file_to_be_copied,
                    name_of_new_duplicate_file ) ;
      }
   }

}