CustomerManager.java

package legacy.model;

import legacy.enums.CustomerStatus;

import java.util.ArrayList;

public class CustomerManager {

    private final ArrayList<Customer> customers = new ArrayList<>();

    public Customer createCustomer(String id, String name, CustomerStatus status) {
        Customer customer = new Customer(id, name, status);

        customers.add(customer);

        return customer;
    }


    public Customer updateCustomer(String id, String newName) {
        Customer customer = getCustomer(id);
        customer.setName(newName);

        return customer;
    }

    public void deleteCustomer(String id) {
        customers.remove(getCustomer(id));
    }


    public String getOldName(String id) {
        return getCustomer(id).getName();
    }

    private Customer getCustomer(String id) {
        for (Customer customer : customers) {

            if (customer.getId().equals(id)) {
                return customer;
            }
        }

        throw new IllegalArgumentException("존재하지 않는 ID : " + id);
    }

    public ArrayList<Customer> getCustomers() {
        return customers;
    }
}