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Java 11 migration: patterns (remaining b-c) (#1081)

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* Moves business-delegate pattern  to java 11

* Moves bytecode pattern  to java 11

* Moves caching pattern  to java 11

* Moves callback pattern  to java 11

* Moves chain pattern  to java 11

* Moves circuit-breaker pattern  to java 11

* Moves collection-pipeline pattern  to java 11

* Moves command pattern  to java 11

* Moves commander pattern  to java 11

* Moves composite pattern  to java 11

* Corrects test cases
This commit is contained in:
Anurag Agarwal
2019-11-13 01:26:46 +05:30
committed by Ilkka Seppälä
parent 6ef840f3cf
commit 33ea7335b1
63 changed files with 798 additions and 979 deletions
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22
collection-pipeline/src/main/java/com/iluwatar/collectionpipeline/App.java
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@ -24,7 +24,6 @@
package com.iluwatar.collectionpipeline;
import java.util.List;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@ -46,31 +45,26 @@ public class App {
* @param args command line args
*/
public static void main(String[] args) {
var cars = CarFactory.createCars();
List<Car> cars = CarFactory.createCars();
List<String> modelsImperative = ImperativeProgramming.getModelsAfter2000(cars);
var modelsImperative = ImperativeProgramming.getModelsAfter2000(cars);
LOGGER.info(modelsImperative.toString());
List<String> modelsFunctional = FunctionalProgramming.getModelsAfter2000(cars);
var modelsFunctional = FunctionalProgramming.getModelsAfter2000(cars);
LOGGER.info(modelsFunctional.toString());
Map<Category, List<Car>> groupingByCategoryImperative =
ImperativeProgramming.getGroupingOfCarsByCategory(cars);
var groupingByCategoryImperative = ImperativeProgramming.getGroupingOfCarsByCategory(cars);
LOGGER.info(groupingByCategoryImperative.toString());
Map<Category, List<Car>> groupingByCategoryFunctional =
FunctionalProgramming.getGroupingOfCarsByCategory(cars);
var groupingByCategoryFunctional = FunctionalProgramming.getGroupingOfCarsByCategory(cars);
LOGGER.info(groupingByCategoryFunctional.toString());
Person john = new Person(cars);
var john = new Person(cars);
List<Car> sedansOwnedImperative =
ImperativeProgramming.getSedanCarsOwnedSortedByDate(List.of(john));
var sedansOwnedImperative = ImperativeProgramming.getSedanCarsOwnedSortedByDate(List.of(john));
LOGGER.info(sedansOwnedImperative.toString());
List<Car> sedansOwnedFunctional =
FunctionalProgramming.getSedanCarsOwnedSortedByDate(List.of(john));
var sedansOwnedFunctional = FunctionalProgramming.getSedanCarsOwnedSortedByDate(List.of(john));
LOGGER.info(sedansOwnedFunctional.toString());
}
}

67
collection-pipeline/src/main/java/com/iluwatar/collectionpipeline/ImperativeProgramming.java
View File

@ -23,12 +23,12 @@
package com.iluwatar.collectionpipeline;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
/**
* Imperative-style programming to iterate over the list and get the names of cars made later than
@ -57,26 +57,11 @@ public class ImperativeProgramming {
* @return {@link List} of {@link String} of car models built after year 2000
*/
public static List<String> getModelsAfter2000(List<Car> cars) {
List<Car> carsSortedByYear = new ArrayList<>();
for (Car car : cars) {
if (car.getYear() > 2000) {
carsSortedByYear.add(car);
}
}
Collections.sort(carsSortedByYear, new Comparator<Car>() {
public int compare(Car car1, Car car2) {
return new Integer(car1.getYear()).compareTo(car2.getYear());
}
});
List<String> models = new ArrayList<>();
for (Car car : carsSortedByYear) {
models.add(car.getModel());
}
return models;
return cars.stream()
.filter(car -> car.getYear() > 2000)
.sorted(Comparator.comparingInt(Car::getYear))
.map(Car::getModel)
.collect(Collectors.toList());
}
/**
@ -86,17 +71,7 @@ public class ImperativeProgramming {
* @return {@link Map} with category as key and cars belonging to that category as value
*/
public static Map<Category, List<Car>> getGroupingOfCarsByCategory(List<Car> cars) {
Map<Category, List<Car>> groupingByCategory = new HashMap<>();
for (Car car : cars) {
if (groupingByCategory.containsKey(car.getCategory())) {
groupingByCategory.get(car.getCategory()).add(car);
} else {
List<Car> categoryCars = new ArrayList<>();
categoryCars.add(car);
groupingByCategory.put(car.getCategory(), categoryCars);
}
}
return groupingByCategory;
return cars.stream().collect(Collectors.groupingBy(Car::getCategory));
}
/**
@ -107,25 +82,11 @@ public class ImperativeProgramming {
* @return {@link List} of {@link Car} to belonging to the group
*/
public static List<Car> getSedanCarsOwnedSortedByDate(List<Person> persons) {
List<Car> cars = new ArrayList<>();
for (Person person : persons) {
cars.addAll(person.getCars());
}
List<Car> sedanCars = new ArrayList<>();
for (Car car : cars) {
if (Category.SEDAN.equals(car.getCategory())) {
sedanCars.add(car);
}
}
sedanCars.sort(new Comparator<Car>() {
@Override
public int compare(Car o1, Car o2) {
return o1.getYear() - o2.getYear();
}
});
return sedanCars;
return persons.stream()
.map(Person::getCars)
.flatMap(Collection::stream)
.filter(car -> car.getCategory() == Category.SEDAN)
.sorted(Comparator.comparingInt(Car::getYear))
.collect(Collectors.toList());
}
}