31 lines
715 B
Java
31 lines
715 B
Java
package com.baeldung.dip.daoimplementations;
|
|
|
|
import com.baeldung.dip.daos.CustomerDao;
|
|
import com.baeldung.dip.entities.Customer;
|
|
import java.util.HashMap;
|
|
import java.util.Map;
|
|
import java.util.Optional;
|
|
|
|
public class SimpleCustomerDao implements CustomerDao {
|
|
|
|
private Map<Integer, Customer> customers = new HashMap<>();
|
|
|
|
public SimpleCustomerDao() {
|
|
|
|
}
|
|
|
|
public SimpleCustomerDao(Map<Integer, Customer> customers) {
|
|
this.customers = customers;
|
|
}
|
|
|
|
@Override
|
|
public Optional<Customer> findById(int id) {
|
|
return Optional.ofNullable(customers.get(id));
|
|
}
|
|
|
|
@Override
|
|
public List<Customer> findAll() {
|
|
return new ArrayList<>(customers.values());
|
|
}
|
|
}
|