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63 lines (54 loc) · 2.31 KB
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import com.h2.BestLoanRates;
import com.h2.MortgageCalculator;
import com.h2.SavingsCalculator;
import java.util.Arrays;
import java.util.Map;
public class Finance {
public static final String BEST_LOAN_RATES = "bestLoanRates";
public static final String SAVINGS_CALCULATOR = "savingsCalculator";
public static final String MORTGAGE_CALCULATOR = "mortgageCalculator";
public static final Map<String, String> commandsToUsage = Map.of(
BEST_LOAN_RATES, "usage: bestLoanRates",
SAVINGS_CALCULATOR, "usage: savingsCalculator <credits separated by ','> <debits separated by ','>",
MORTGAGE_CALCULATOR, "usage: mortgageCalculator <loanAmount> <termInYears> <annualRate>"
);
public static void main(String[] args) {
final String command = args[0];
if (!commandsToUsage.containsKey(command)) {
System.out.println(command + ": command not found");
System.exit(-1);
}
final boolean isValidCommand = validateCommandArguments(args);
if (!isValidCommand) {
System.out.println(commandsToUsage.get(args[0]));
System.exit(-1);
}
executeCommand(command, Arrays.copyOfRange(args, 1, args.length));
}
private static void executeCommand(String command, String[] arguments) {
switch (command) {
case BEST_LOAN_RATES:
System.out.println("Finding best loan rates ..."); // for testing just log
BestLoanRates.main(arguments); // for another test call these methods and have executeCommand add to main method
return;
case SAVINGS_CALCULATOR:
System.out.println("Finding your net savings ...");
SavingsCalculator.main(arguments);
return;
case MORTGAGE_CALCULATOR:
System.out.println("Finding your monthly payment ...");
MortgageCalculator.main(arguments);
}
}
private static boolean validateCommandArguments(String[] args) {
switch (args[0]) {
case BEST_LOAN_RATES:
return args.length == 1;
case SAVINGS_CALCULATOR:
return args.length == 3;
case MORTGAGE_CALCULATOR:
return args.length == 4;
}
return false;
}
}