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58 lines (54 loc) · 2.22 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;
import static java.util.Arrays.copyOfRange;
public class Finance {
public final static String BEST_LOAN_RATES = "bestLoanRates";
public final static String SAVINGS_CALCULATOR = "savingsCalculator";
public final static 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;
}
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));
}
}