Java tutorial
/* * Copyright 2016 Jasha Joachimsthal * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package eu.jasha.demo.sbtfragments; import org.apache.commons.lang3.StringUtils; import org.springframework.stereotype.Repository; import java.util.*; @Repository public class CityDao { private Set<City> cities = new HashSet<>(); public Optional<City> find(String id) { return cities.stream().filter(c -> c.getId().equals(id)).findFirst(); } public void add(City city) { cities.add(city); } public void update(City city) { remove(city.getId()); add(city); } public void remove(String id) { if (StringUtils.isNotBlank(id)) { cities.removeIf(c -> c.getId().equals(id)); } } public List<City> getAll() { List<City> cityList = new ArrayList<>(cities); cityList.sort((o1, o2) -> o1.getName().compareTo(o2.getName())); return cityList; } }