refactoring(DomainObject): Generalized DomainObject

core/src/main/java/cz/muni/pa165/data/model/Car.java

@@ -11,7 +11,7 @@ import java.util.Set;
 
 @Entity
 @Table(name = "car")
-public class Car extends DomainObject implements Serializable {
+public class Car extends DomainObject<Long> implements Serializable {
     @OneToOne(fetch = FetchType.LAZY)
     @JoinColumn(name = "driver_id")
     @Nullable

core/src/main/java/cz/muni/pa165/data/model/CarComponent.java

@@ -12,7 +12,7 @@ import java.util.Objects;
 
 @Entity
 @Table(name = "car_component")
-public class CarComponent extends DomainObject implements Serializable {
+public class CarComponent extends DomainObject<Long> implements Serializable {
 
     @Column(name = "component_type")
     @Enumerated(EnumType.STRING)

core/src/main/java/cz/muni/pa165/data/model/Department.java

@@ -10,7 +10,7 @@ import java.util.Set;
 
 @Entity
 @Table(name = "department")
-public class Department extends DomainObject implements Serializable {
+public class Department extends DomainObject<Long> implements Serializable {
 
     @NotEmpty
     private String specialization;

core/src/main/java/cz/muni/pa165/data/model/DomainObject.java

@@ -6,20 +6,22 @@ import jakarta.persistence.GenerationType;
 import jakarta.persistence.Id;
 import jakarta.persistence.MappedSuperclass;
 
+import java.io.Serializable;
+
 /**
  * @author Michal Badin
  */
 @MappedSuperclass
-public abstract class DomainObject {
+public abstract class DomainObject<PK extends Serializable> implements Serializable {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
-    private Long id;
+    private PK id;
 
-    public Long getId() {
+    public PK getId() {
         return id;
     }
 
-    public void setId(Long id) {
+    public void setId(PK id) {
         this.id = id;
     }
 }

core/src/main/java/cz/muni/pa165/data/model/Driver.java

@@ -16,7 +16,7 @@ import java.util.Set;
 
 @Entity
 @Table(name = "driver")
-public class Driver extends DomainObject implements Serializable {
+public class Driver extends DomainObject<Long> implements Serializable {
 
     @NotEmpty
     private String name;

core/src/main/java/cz/muni/pa165/data/model/Engineer.java

@@ -9,7 +9,7 @@ import java.util.Objects;
 
 @Entity
 @Table(name = "engineer")
-public class Engineer extends DomainObject implements Serializable {
+public class Engineer extends DomainObject<Long> implements Serializable {
 
     @NotEmpty
     private String name;