/**
 * Title: CmdLine2
 * Description: Demo of custom exception
 * @author hollingd@cs.rpi.edu
 */

// create our own type of exception
// exceptions are just objects !

class CmdLineException extends Exception {
    CmdLineException(){}
    CmdLineException(String s) { super(s); }
}


//  a class that can convert an array of Strings to
//  to an array of integers.
class CmdLineInts {
    int x[];
    // Constructor with just args, in this case we
    // don't care how many are specified on the command line,
    //  we convert them all
    CmdLineInts(String args[] )  throws CmdLineException {
	x = new int[args.length];

	int i=0;
	try {
	    for (i=0;i<args.length;i++) 
		x[i] = Integer.parseInt(args[i]);
	} catch (NumberFormatException nfe) {
	    throw new CmdLineException("Invalid argument format: " + args[i]);
	} catch (Exception e) {
	    throw new CmdLineException("Unknown command line error");
	}
    }

    // Constructor with args and number of args.
    CmdLineInts(String args[], int num )  throws CmdLineException, Exception {
	x = new int[num];

	int i=0;
	try {
	    for (i=0;i<num;i++) 
		x[i] = Integer.parseInt(args[i]);
	} catch (NumberFormatException nfe) {
	    throw new CmdLineException("Invalid argument format: " + args[i]);
	} catch (ArrayIndexOutOfBoundsException ae) {
	    throw new CmdLineException("Not enough args");
	} catch (Exception up) {
	    // here is an example of re-throwing an exception
	    // (unmodified).
	    throw up;
	}

    }
		

    public int []GetInts() {
	return(x);
    }
}


public class CmdLine2{

    public static void main(String[] args) {
	int x[];

	try {
	    CmdLineInts c = new CmdLineInts(args);
	    x = c.GetInts();

	    // print out the ints.
	    System.out.print("Args: ");
	    for (int i=0;i<x.length;i++) {
		System.out.print(x[i]+ " ");
	    }
	    // just print newline
	    System.out.println();

	} catch (Exception e) {
	    e.printStackTrace(System.out);
	}

	// now try but insist on at least 3 ints

	try {
	    CmdLineInts c = new CmdLineInts(args,3);
	    x = c.GetInts();

	    // print out the ints.
	    System.out.print("Args: ");
	    for (int i=0;i<x.length;i++) {
		System.out.print(x[i]+ " ");
	    }
	    // just print newline
	    System.out.println();

	} catch (Exception e) {
	    e.printStackTrace(System.out);
	}
    }
}