01e489c77b
* Reduces checkstyle errors in dao * Reduces checkstyle errors in data-bus * Reduces checkstyle errors in data-locality * Reduces checkstyle errors in data-mapper * Reduces checkstyle errors in data-transfer-object * Reduces checkstyle errors in decorator
74 lines
2.3 KiB
Java
74 lines
2.3 KiB
Java
/*
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* The MIT License
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* Copyright © 2014-2019 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.dao;
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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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import java.util.stream.Stream;
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/**
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* An in memory implementation of {@link CustomerDao}, which stores the customers in JVM memory and
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* data is lost when the application exits.
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* <br>
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* This implementation is useful as temporary database or for testing.
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*/
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public class InMemoryCustomerDao implements CustomerDao {
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private Map<Integer, Customer> idToCustomer = new HashMap<>();
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/**
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* An eagerly evaluated stream of customers stored in memory.
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*/
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@Override
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public Stream<Customer> getAll() {
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return idToCustomer.values().stream();
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}
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@Override
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public Optional<Customer> getById(final int id) {
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return Optional.ofNullable(idToCustomer.get(id));
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}
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@Override
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public boolean add(final Customer customer) {
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if (getById(customer.getId()).isPresent()) {
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return false;
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}
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idToCustomer.put(customer.getId(), customer);
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return true;
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}
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@Override
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public boolean update(final Customer customer) {
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return idToCustomer.replace(customer.getId(), customer) != null;
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}
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@Override
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public boolean delete(final Customer customer) {
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return idToCustomer.remove(customer.getId()) != null;
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}
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}
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