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Expansion - "Redefining the Service Layer with Groovy Categories"
class LocalPaymentService implements PaymentService {
// Dependency injected from container
CreditCardPaymentGateway creditCardPaymentGateway
GiftCardPaymentGateway giftCardPaymentGateway
CheckPaymentGateway checkPaymentGateway
EmployeePaymentGateway employeePaymentGateway
public String process(PaymentType paymentType) throws IllegalArgumentException {
if (paymentType instanceof CreditCardPaymentType) {
return doProcess(paymentType)
} else if (paymentType instanceof GiftCardPaymentType) {
return doProcess(paymentType)
} else if (paymentType instanceof CheckPaymentType) {
return doProcess(paymentType)
} else if (paymentType instanceof EmployeePaymentType) {
return doProcess(paymentType)
}
throw new IllegalArgumentException("Supplied payment type is not supported.");
}
private String doProcess(CreditCardPaymentType paymentType) {
// ...
}
private String doProcess(GiftCardPaymentType paymentType) {
// ...
}
private String doProcess(CheckPaymentType paymentType) {
// ...
}
private String doProcess(EmployeePaymentType paymentType) {
// ...
}
}
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