/*
 * CompSci 101 - Keyboard Class
 * ============================
 * This class is used for input from the keyboard. 
 * YOU DO NOT NEED TO UNDERSTAND THE DETAILS OF THIS CLASS. 
 * To use this class, put it in the same directory as the source file for your program, and include the statement:
 * String input = Keyboard.readInput(); in your program. 
 * This will assign whatever is typed at the keyboard to the input variable.
 * 
 * This version tries to determine whether input is coming from the keyboard or from
 * a redirected file. If it is coming from a file it echoes the information to the screen.
 * The way it does this is to see how much data is currently available to be read from the file.
 * It assumes the keyboard has no data waiting, until the user types some in.
 */
import java.io.*;

public class Keyboard {
	
	private static BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
	private static boolean redirected;

	public Keyboard() {
		try {
			redirected = (System.in).available() != 0;
		} catch (IOException e) {
			System.err.println("An error has occurred in the Keyboard constructor.");
			e.printStackTrace();
			System.exit(-1);
		}
	}

	public static String readInput() {
		try {
			String input = in.readLine();
			if (redirected) {
				System.out.println(input);
			}
			return input;
		} catch (IOException e) {
			System.err.println("An error has occurred in the Keyboard.readInput() method.");
			e.printStackTrace();
			System.exit(-1);
		}
		return null;
	}
}