/**
 *
 * Extended program to test the "Temperature" class
 *
 */

public class Chapter8n2
    {

    public static void main(String [] args)
	{
	String flag, strCel;
	Double myDouble = new Double(0.0);
	double temp;
	boolean valid = true;
	Temperature temperature = new Temperature();
	char flagChar;

	// have we got two arguments?
	if (args.length != 2)
	    {
	    System.out.println("incorrect number of arguments : 2 expected"); 
	    System.exit(1);
	    }

	// does the first argument look like a flag?
	flag = args[0];
	if (flag.charAt(0) != '-')
	    {
	    System.out.println("first argument not a flag");
	    System.exit(1);
	    }

	// ok it's a flag but is it valid?
	flagChar = flag.charAt(1);
	switch (flagChar)
	    {
	    case 'f' :
	    case 'c' :
		break;
	    default :
		System.out.println("unknown flag [" + flagChar + "] used"); 
		System.exit(1);
	    }

	strCel = args[1];
	try {
	    myDouble = Double.valueOf(strCel);
	    }
	catch (NumberFormatException e)
	    {
	    System.out.println("parameter provided [" + 
		strCel + "] not in double format"); 
	    valid = false;
	    }

	if (valid)
	    {
	    temp = myDouble.doubleValue();
	    switch (flagChar)
		{
		case 'f' :
		    temperature.setFahr(temp); 
		    break;
		case 'c' : 
		    temperature.setCelsius(temp);
		}
	    System.out.println(temperature); 
	    }
	}// end of main method

    } // end of class Chapter8n2