Adjust JPA classes

hibernate-mappings/src/main/java/by/andd3dfx/model/shop/OneSizeItem.java

@@ -0,0 +1,24 @@
+package by.andd3dfx.model.shop;
+
+import lombok.Data;
+
+import javax.persistence.Column;
+import javax.persistence.DiscriminatorValue;
+import javax.persistence.Entity;
+
+@Data
+@Entity
+@DiscriminatorValue("1-size")
+public class OneSizeItem extends ZeroSizeItem {
+
+    @Column
+    private Double length;
+
+    @Override
+    public String toString() {
+        return "OneSizeItem{" +
+                super.toString() +
+                ", length=" + length +
+                '}';
+    }
+}

hibernate-mappings/src/main/java/by/andd3dfx/model/shop/ThreeSizeItem.java

@@ -0,0 +1,23 @@
+package by.andd3dfx.model.shop;
+
+import javax.persistence.Column;
+import javax.persistence.DiscriminatorValue;
+import javax.persistence.Entity;
+import lombok.Data;
+
+@Data
+@Entity
+@DiscriminatorValue("3-size")
+public class ThreeSizeItem extends TwoSizeItem {
+
+    @Column
+    private Double height;
+
+    @Override
+    public String toString() {
+        return "ThreeSizeItem{" +
+                super.toString() +
+                ", height=" + height +
+                '}';
+    }
+}

hibernate-mappings/src/main/java/by/andd3dfx/model/shop/TwoSizeItem.java

@@ -0,0 +1,23 @@
+package by.andd3dfx.model.shop;
+
+import javax.persistence.Column;
+import javax.persistence.DiscriminatorValue;
+import javax.persistence.Entity;
+import lombok.Data;
+
+@Data
+@Entity
+@DiscriminatorValue("2-size")
+public class TwoSizeItem extends OneSizeItem {
+
+    @Column
+    private Double width;
+
+    @Override
+    public String toString() {
+        return "TwoSizeItem{" +
+                super.toString() +
+                ", width=" + width +
+                '}';
+    }
+}

hibernate-mappings/src/main/java/by/andd3dfx/model/shop/ItemWithoutSize.java → hibernate-mappings/src/main/java/by/andd3dfx/model/shop/ZeroSizeItem.java

@@ -6,6 +6,7 @@
 
 @Data
 @Entity
-@DiscriminatorValue("ITEM")
-public class ItemWithoutSize extends BaseItem {
+@DiscriminatorValue("0-size")
+public class ZeroSizeItem extends BaseItem {
+
 }

hibernate-mappings/src/main/resources/hibernate.cfg.xml

@@ -18,8 +18,9 @@
     <mapping class="by.andd3dfx.model.library.Address"/>
     <mapping class="by.andd3dfx.model.library.Publisher"/>
 
-    <mapping class="by.andd3dfx.model.shop.ItemWithLengthAndDiameter"/>
-    <mapping class="by.andd3dfx.model.shop.ItemWithoutSize"/>
-    <mapping class="by.andd3dfx.model.shop.ItemWithThreeSizes"/>
+    <mapping class="by.andd3dfx.model.shop.ZeroSizeItem"/>
+    <mapping class="by.andd3dfx.model.shop.OneSizeItem"/>
+    <mapping class="by.andd3dfx.model.shop.TwoSizeItem"/>
+    <mapping class="by.andd3dfx.model.shop.ThreeSizeItem"/>
   </session-factory>
 </hibernate-configuration>

hibernate-mappings/src/test/java/by/andd3dfx/HibernateMainIT.java

@@ -3,36 +3,38 @@
 import static org.hamcrest.CoreMatchers.is;
 import static org.hamcrest.MatcherAssert.assertThat;
 
+import java.util.List;
+import javax.persistence.EntityManager;
+import javax.persistence.Query;
+
 import by.andd3dfx.model.library.Address;
 import by.andd3dfx.model.library.Author;
 import by.andd3dfx.model.library.Book;
 import by.andd3dfx.model.library.Publisher;
-import java.util.List;
-import javax.persistence.EntityManager;
-import javax.persistence.Query;
+import lombok.SneakyThrows;
 import org.hibernate.Session;
-import org.hibernate.SessionFactory;
 import org.hibernate.cfg.Configuration;
 import org.junit.Test;
 
 public class HibernateMainIT {
 
+    @SneakyThrows
     @Test
     public void checkRecordsExistence() {
-        SessionFactory sf = new Configuration().configure().buildSessionFactory();
-        Session session = sf.openSession();
-        EntityManager entityManager = session.getEntityManagerFactory().createEntityManager();
-
-        getFromDbAndCheck(session, Book.class, 4);
-        getFromDbAndCheck(session, Address.class, 2);
-        getFromDbAndCheck(session, Author.class, 3);
-        getFromDbAndCheck(session, Publisher.class, 2);
-
-        getFromDbAndCheck(entityManager, "ItemWithoutSize", 1);
-        getFromDbAndCheck(entityManager, "ItemWithLengthAndDiameter", 2);
-        getFromDbAndCheck(entityManager, "ItemWithThreeSizes", 1);
-
-        session.close();
+        try (var sessionFactory = new Configuration().configure().buildSessionFactory()) {
+            try (var session = sessionFactory.openSession()) {
+                getFromDbAndCheck(session, Book.class, 4);
+                getFromDbAndCheck(session, Address.class, 2);
+                getFromDbAndCheck(session, Author.class, 3);
+                getFromDbAndCheck(session, Publisher.class, 2);
+
+                EntityManager entityManager = session.getEntityManagerFactory().createEntityManager();
+                getFromDbAndCheck(entityManager, "ZeroSizeItem", 1);
+                getFromDbAndCheck(entityManager, "OneSizeItem", 1);
+                getFromDbAndCheck(entityManager, "TwoSizeItem", 2);
+                getFromDbAndCheck(entityManager, "ThreeSizeItem", 1);
+            }
+        }
     }
 
     private void getFromDbAndCheck(Session session, Class clazz, int expectedItemsCount) {