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65 lines (54 loc) · 1.87 KB
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import java.util.Arrays;
import java.util.Map;
import com.h2.BestLoanRates;
import com.h2.MortgageCalculator;
import com.h2.SavingsCalculator;
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 final static 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>");
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;
default:
return false;
}
}
private static void executeCommand(String command, String[] arguments) {
switch(command) {
case BEST_LOAN_RATES:
System.out.println("Finding best loan rates ...");
BestLoanRates.main(arguments);
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);
return;
}
}
public static void main(String[] args) {
String command = args[0];
if(!commandsToUsage.containsKey(command)) {
System.out.println(command + ": command not found");
return;
}
boolean isValidCommand = validateCommandArguments(args);
if(!isValidCommand) {
System.out.println(commandsToUsage.get(args[0]));
return;
}
executeCommand(command, Arrays.copyOfRange(args, 1, args.length));
}
}