import java.io.BufferedReader;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.FileNotFoundException;
import javax.swing.JOptionPane;

/**
 * A class to open files for input/output after prompting for the file name
 * @author Bill Kraynek
 */

public class OpenFiles {

	/**
	  * Prompts the user for a file name and opens the file for input
	  * @return the opened file
	  */
	  
	public static FileReader getNameAndOpenInput() throws IOException {
	    int tries = 1;
	    String fileName;
	    while(true) {
		    fileName = JOptionPane.showInputDialog("Enter the input file name");
		    if( fileName == null ) {
		    	return null;
		    } // end if
		    try {
			    return new FileReader(fileName);
		    } catch( FileNotFoundException e ) {
			    if( tries > 2 ) throw e;
			    JOptionPane.showMessageDialog(null,fileName + " could not be opened. Try again.");
			    tries++;
			    if( tries == 3 ) JOptionPane.showMessageDialog(null,"This is your last try!");
		    } // try/catch
	    } // end while
	} // end getNameAndOpenInput


    /**
      * Prompts the user for a file name and opens the file for output
      * @return the opened file
      */

    public static FileWriter getNameAndOpenOutput() throws IOException {
        String fileName;
        int tries = 1;
        while(true) {
		    fileName = JOptionPane.showInputDialog("Enter the output file name");
		    if( fileName == null ) {
		    	return null;
		    } // end if
		    try {
		    	return new FileWriter(fileName);
		    } catch( IOException e ) {
		    	if( tries > 2 ) throw e;
			    JOptionPane.showMessageDialog(null,fileName + " could not be opened. Try again.");
			    tries++;
			    if( tries == 3 ) JOptionPane.showMessageDialog(null,"This is your last try!");
			} // try/catch
        } // end while
     } // end getNameAndOpenOutput

} // end OpenFiles