/*
 * utiity function(s) for Java programs
 */
package csci3366.sample.utility;

public class Utility {

    /* 
     * get integer from command-line argument.
     * prints error message(s) and exits program on error.
     */
    public static int getIntegerArg(String[] args, int argIndex, 
        int minVal, String description, String usageMsg)
    {
        if (args.length <= argIndex) {
            System.err.println(usageMsg);
            System.exit(1);
        }
        int rval = 0;
        try {
            rval = Integer.parseInt(args[argIndex]);
        }
        catch (NumberFormatException e) {
            System.err.println("non-numeric value for " + description);
            System.exit(1);
        }
        if (rval < minVal) {
            System.err.println(description + " must be at least " + minVal);
            System.exit(1);
        }
        return rval;
    }

    /* 
     * get long integer from command-line argument.
     * prints error message(s) and exits program on error.
     */
    public static long getLongArg(String[] args, int argIndex, 
        long minVal, String description, String usageMsg)
    {
        if (args.length <= argIndex) {
            System.err.println(usageMsg);
            System.exit(1);
        }
        long rval = 0;
        try {
            rval = Long.parseLong(args[argIndex]);
        }
        catch (NumberFormatException e) {
            System.err.println("non-numeric value for " + description);
            System.exit(1);
        }
        if (rval < minVal) {
            System.err.println(description + " must be at least " + minVal);
            System.exit(1);
        }
        return rval;
    }
}