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Category Enum for category of Car

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nikhilbarar
2018-08-29 22:02:17 +05:30
parent b23d8430af
commit 9daa3140e4
7 changed files with 50 additions and 18 deletions
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4
collection-pipeline/src/main/java/com/iluwatar/collectionpipeline/App.java
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@@ -59,10 +59,10 @@ public class App {
List<String> modelsFunctional = FunctionalProgramming.getModelsAfter2000(cars);
LOGGER.info(modelsFunctional.toString());
Map<String, List<Car>> groupingByCategoryImperative = ImperativeProgramming.getGroupingOfCarsByCategory(cars);
Map<Category, List<Car>> groupingByCategoryImperative = ImperativeProgramming.getGroupingOfCarsByCategory(cars);
LOGGER.info(groupingByCategoryImperative.toString());
Map<String, List<Car>> groupingByCategoryFunctional = FunctionalProgramming.getGroupingOfCarsByCategory(cars);
Map<Category, List<Car>> groupingByCategoryFunctional = FunctionalProgramming.getGroupingOfCarsByCategory(cars);
LOGGER.info(groupingByCategoryFunctional.toString());
Person john = new Person(cars);

9
collection-pipeline/src/main/java/com/iluwatar/collectionpipeline/Car.java
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@@ -23,21 +23,22 @@
package com.iluwatar.collectionpipeline;
/**
* A Car class that has the properties of make, model, and year.
* A Car class that has the properties of make, model, year and category.
*/
public class Car {
private String make;
private String model;
private int year;
private String category;
private Category category;
/**
* Constructor to create an instance of car.
* @param make the make of the car
* @param model the model of the car
* @param yearOfMake the year of built of the car
* @param category the {@link Category} of the car
*/
public Car(String make, String model, int yearOfMake, String category) {
public Car(String make, String model, int yearOfMake, Category category) {
this.make = make;
this.model = model;
this.year = yearOfMake;
@@ -56,7 +57,7 @@ public class Car {
return year;
}
public String getCategory() {
public Category getCategory() {
return category;
}
}

11
collection-pipeline/src/main/java/com/iluwatar/collectionpipeline/CarFactory.java
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@@ -37,10 +37,11 @@ public class CarFactory {
* @return {@link List} of {@link Car}
*/
public static List<Car> createCars() {
return Arrays.asList(new Car("Jeep", "Wrangler", 2011, "Jeep"), new Car("Jeep", "Comanche", 1990, "Jeep"),
new Car("Dodge", "Avenger", 2010, "Sedan"),
new Car("Buick", "Cascada", 2016, "Convertible"),
new Car("Ford", "Focus", 2012, "Sedan"),
new Car("Chevrolet", "Geo Metro", 1992, "Convertible"));
return Arrays.asList(new Car("Jeep", "Wrangler", 2011, Category.JEEP),
new Car("Jeep", "Comanche", 1990, Category.JEEP),
new Car("Dodge", "Avenger", 2010, Category.SEDAN),
new Car("Buick", "Cascada", 2016, Category.CONVERTIBLE),
new Car("Ford", "Focus", 2012, Category.SEDAN),
new Car("Chevrolet", "Geo Metro", 1992, Category.CONVERTIBLE));
}
}

30
collection-pipeline/src/main/java/com/iluwatar/collectionpipeline/Category.java Normal file
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@@ -0,0 +1,30 @@
/**
* The MIT License
* Copyright (c) 2014 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.collectionpipeline;
/**
* Enum for the category of car
*/
public enum Category {
JEEP, SEDAN, CONVERTIBLE
}

4
collection-pipeline/src/main/java/com/iluwatar/collectionpipeline/FunctionalProgramming.java
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@@ -66,7 +66,7 @@ public class FunctionalProgramming {
* @param cars {@link List} of {@link Car} to be used for grouping
* @return {@link Map} with category as key and cars belonging to that category as value
*/
public static Map<String, List<Car>> getGroupingOfCarsByCategory(List<Car> cars) {
public static Map<Category, List<Car>> getGroupingOfCarsByCategory(List<Car> cars) {
return cars.stream().collect(Collectors.groupingBy(Car::getCategory));
}
@@ -78,7 +78,7 @@ public class FunctionalProgramming {
*/
public static List<Car> getSedanCarsOwnedSortedByDate(List<Person> persons) {
return persons.stream().map(Person::getCars).flatMap(List::stream)
.filter(car -> "Sedan".equals(car.getCategory()))
.filter(car -> Category.SEDAN.equals(car.getCategory()))
.sorted(Comparator.comparing(Car::getYear)).collect(Collectors.toList());
}
}

6
collection-pipeline/src/main/java/com/iluwatar/collectionpipeline/ImperativeProgramming.java
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@@ -86,8 +86,8 @@ public class ImperativeProgramming {
* @param cars {@link List} of {@link Car} to be used for grouping
* @return {@link Map} with category as key and cars belonging to that category as value
*/
public static Map<String, List<Car>> getGroupingOfCarsByCategory(List<Car> cars) {
Map<String, List<Car>> groupingByCategory = new HashMap<>();
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);
@@ -114,7 +114,7 @@ public class ImperativeProgramming {
List<Car> sedanCars = new ArrayList<>();
for (Car car: cars) {
if ("Sedan".equals(car.getCategory())) {
if (Category.SEDAN.equals(car.getCategory())) {
sedanCars.add(car);
}
}

4
collection-pipeline/src/test/java/com/iluwatar/collectionpipeline/AppTest.java
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@@ -51,8 +51,8 @@ public class AppTest {
@Test
public void testGetGroupingOfCarsByCategory() {
Map<String, List<Car>> modelsFunctional = FunctionalProgramming.getGroupingOfCarsByCategory(cars);
Map<String, List<Car>> modelsImperative = ImperativeProgramming.getGroupingOfCarsByCategory(cars);
Map<Category, List<Car>> modelsFunctional = FunctionalProgramming.getGroupingOfCarsByCategory(cars);
Map<Category, List<Car>> modelsImperative = ImperativeProgramming.getGroupingOfCarsByCategory(cars);
assertEquals(modelsFunctional, modelsImperative);
}