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