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Feature/bael 4662 sealed classes (#10224)

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* BAEL-4662: Initial commit of new module

* BAEL-4662: Example with Records

* BAEL-4662: Example with Interface

* BAEL-4662: Add test classes

* BAEL-4662: Update examples and tests

* BAEL-4662: Rename test classes
This commit is contained in:
Daniel Strmecki
2020-11-03 20:37:30 +01:00
committed by GitHub
parent c89dee8965
commit a8b8d2d498
13 changed files with 389 additions and 0 deletions
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49
core-java-modules/core-java-15/src/main/java/com/baeldung/sealed/alternative/Vehicles.java Normal file
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package com.baeldung.sealed.alternative;
public class Vehicles {
abstract static class Vehicle {
private final String registrationNumber;
public Vehicle(String registrationNumber) {
this.registrationNumber = registrationNumber;
}
public String getRegistrationNumber() {
return registrationNumber;
}
}
public static final class Car extends Vehicle {
private final int numberOfSeats;
public Car(int numberOfSeats, String registrationNumber) {
super(registrationNumber);
this.numberOfSeats = numberOfSeats;
}
public int getNumberOfSeats() {
return numberOfSeats;
}
}
public static final class Truck extends Vehicle {
private final int loadCapacity;
public Truck(int loadCapacity, String registrationNumber) {
super(registrationNumber);
this.loadCapacity = loadCapacity;
}
public int getLoadCapacity() {
return loadCapacity;
}
}
}

21
core-java-modules/core-java-15/src/main/java/com/baeldung/sealed/classes/Car.java Normal file
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package com.baeldung.sealed.classes;
public non-sealed class Car extends Vehicle implements Service {
private final int numberOfSeats;
public Car(int numberOfSeats, String registrationNumber) {
super(registrationNumber);
this.numberOfSeats = numberOfSeats;
}
public int getNumberOfSeats() {
return numberOfSeats;
}
@Override
public int getMaxServiceIntervalInMonths() {
return 12;
}
}

11
core-java-modules/core-java-15/src/main/java/com/baeldung/sealed/classes/Service.java Normal file
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package com.baeldung.sealed.classes;
public sealed interface Service permits Car, Truck {
int getMaxServiceIntervalInMonths();
default int getMaxDistanceBetweenServicesInKilometers() {
return 100000;
}
}

21
core-java-modules/core-java-15/src/main/java/com/baeldung/sealed/classes/Truck.java Normal file
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package com.baeldung.sealed.classes;
public final class Truck extends Vehicle implements Service {
private final int loadCapacity;
public Truck(int loadCapacity, String registrationNumber) {
super(registrationNumber);
this.loadCapacity = loadCapacity;
}
public int getLoadCapacity() {
return loadCapacity;
}
@Override
public int getMaxServiceIntervalInMonths() {
return 18;
}
}

15
core-java-modules/core-java-15/src/main/java/com/baeldung/sealed/classes/Vehicle.java Normal file
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package com.baeldung.sealed.classes;
public abstract sealed class Vehicle permits Car, Truck {
protected final String registrationNumber;
public Vehicle(String registrationNumber) {
this.registrationNumber = registrationNumber;
}
public String getRegistrationNumber() {
return registrationNumber;
}
}

14
core-java-modules/core-java-15/src/main/java/com/baeldung/sealed/records/Car.java Normal file
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package com.baeldung.sealed.records;
public record Car(int numberOfSeats, String registrationNumber) implements Vehicle {
@Override
public String getRegistrationNumber() {
return registrationNumber;
}
public int getNumberOfSeats() {
return numberOfSeats;
}
}

14
core-java-modules/core-java-15/src/main/java/com/baeldung/sealed/records/Truck.java Normal file
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package com.baeldung.sealed.records;
public record Truck(int loadCapacity, String registrationNumber) implements Vehicle {
@Override
public String getRegistrationNumber() {
return registrationNumber;
}
public int getLoadCapacity() {
return loadCapacity;
}
}

7
core-java-modules/core-java-15/src/main/java/com/baeldung/sealed/records/Vehicle.java Normal file
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package com.baeldung.sealed.records;
public sealed interface Vehicle permits Car, Truck {
String getRegistrationNumber();
}

76
core-java-modules/core-java-15/src/test/java/com/baeldung/sealed/classes/VehicleUnitTest.java Normal file
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package com.baeldung.sealed.classes;
import org.assertj.core.api.Assertions;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
import java.lang.constant.ClassDesc;
public class VehicleUnitTest {
private static Vehicle car;
private static Vehicle truck;
@BeforeAll
public static void createInstances() {
car = new Car(5, "VZ500DA");
truck = new Truck(19000, "VZ600TA");
}
@Test
public void givenCar_whenUsingReflectionAPI_thenSuperClassIsSealed() {
Assertions.assertThat(car.getClass().isSealed()).isEqualTo(false);
Assertions.assertThat(car.getClass().getSuperclass().isSealed()).isEqualTo(true);
Assertions.assertThat(car.getClass().getSuperclass().permittedSubclasses())
.contains(ClassDesc.of(car.getClass().getCanonicalName()));
}
@Test
public void givenTruck_whenUsingReflectionAPI_thenSuperClassIsSealed() {
Assertions.assertThat(truck.getClass().isSealed()).isEqualTo(false);
Assertions.assertThat(truck.getClass().getSuperclass().isSealed()).isEqualTo(true);
Assertions.assertThat(truck.getClass().getSuperclass().permittedSubclasses())
.contains(ClassDesc.of(truck.getClass().getCanonicalName()));
}
@Test
public void givenCar_whenGettingPropertyTraditionalWay_thenNumberOfSeatsPropertyIsReturned() {
Assertions.assertThat(getPropertyTraditionalWay(car)).isEqualTo(5);
}
@Test
public void givenCar_whenGettingPropertyViaPatternMatching_thenNumberOfSeatsPropertyIsReturned() {
Assertions.assertThat(getPropertyViaPatternMatching(car)).isEqualTo(5);
}
@Test
public void givenTruck_whenGettingPropertyTraditionalWay_thenLoadCapacityIsReturned() {
Assertions.assertThat(getPropertyTraditionalWay(truck)).isEqualTo(19000);
}
@Test
public void givenTruck_whenGettingPropertyViaPatternMatching_thenLoadCapacityIsReturned() {
Assertions.assertThat(getPropertyViaPatternMatching(truck)).isEqualTo(19000);
}
private int getPropertyTraditionalWay(Vehicle vehicle) {
if (vehicle instanceof Car) {
return ((Car) vehicle).getNumberOfSeats();
} else if (vehicle instanceof Truck) {
return ((Truck) vehicle).getLoadCapacity();
} else {
throw new RuntimeException("Unknown instance of Vehicle");
}
}
private int getPropertyViaPatternMatching(Vehicle vehicle) {
if (vehicle instanceof Car car) {
return car.getNumberOfSeats();
} else if (vehicle instanceof Truck truck) {
return truck.getLoadCapacity();
} else {
throw new RuntimeException("Unknown instance of Vehicle");
}
}
}

76
core-java-modules/core-java-15/src/test/java/com/baeldung/sealed/records/VehicleUnitTest.java Normal file
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package com.baeldung.sealed.records;
import org.assertj.core.api.Assertions;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
import java.lang.constant.ClassDesc;
public class VehicleUnitTest {
private static Vehicle car;
private static Vehicle truck;
@BeforeAll
public static void createInstances() {
car = new Car(4, "VZ500DA");
truck = new Truck(16000, "VZ600TA");
}
@Test
public void givenCar_whenUsingReflectionAPI_thenInterfaceIsSealed() {
Assertions.assertThat(car.getClass().isSealed()).isEqualTo(false);
Assertions.assertThat(car.getClass().getInterfaces()[0].isSealed()).isEqualTo(true);
Assertions.assertThat(car.getClass().getInterfaces()[0].permittedSubclasses())
.contains(ClassDesc.of(car.getClass().getCanonicalName()));
}
@Test
public void givenTruck_whenUsingReflectionAPI_thenInterfaceIsSealed() {
Assertions.assertThat(truck.getClass().isSealed()).isEqualTo(false);
Assertions.assertThat(truck.getClass().getInterfaces()[0].isSealed()).isEqualTo(true);
Assertions.assertThat(truck.getClass().getInterfaces()[0].permittedSubclasses())
.contains(ClassDesc.of(truck.getClass().getCanonicalName()));
}
@Test
public void givenCar_whenGettingPropertyTraditionalWay_thenNumberOfSeatsPropertyIsReturned() {
Assertions.assertThat(getPropertyTraditionalWay(car)).isEqualTo(4);
}
@Test
public void givenCar_whenGettingPropertyViaPatternMatching_thenNumberOfSeatsPropertyIsReturned() {
Assertions.assertThat(getPropertyViaPatternMatching(car)).isEqualTo(4);
}
@Test
public void givenTruck_whenGettingPropertyTraditionalWay_thenLoadCapacityIsReturned() {
Assertions.assertThat(getPropertyTraditionalWay(truck)).isEqualTo(16000);
}
@Test
public void givenTruck_whenGettingPropertyViaPatternMatching_thenLoadCapacityIsReturned() {
Assertions.assertThat(getPropertyViaPatternMatching(truck)).isEqualTo(16000);
}
private int getPropertyTraditionalWay(Vehicle vehicle) {
if (vehicle instanceof Car) {
return ((Car) vehicle).getNumberOfSeats();
} else if (vehicle instanceof Truck) {
return ((Truck) vehicle).getLoadCapacity();
} else {
throw new RuntimeException("Unknown instance of Vehicle");
}
}
private int getPropertyViaPatternMatching(Vehicle vehicle) {
if (vehicle instanceof Car car) {
return car.getNumberOfSeats();
} else if (vehicle instanceof Truck truck) {
return truck.getLoadCapacity();
} else {
throw new RuntimeException("Unknown instance of Vehicle");
}
}
}