refactor(jpa): apply Hibernate-safe equals and hashCode implementations

backend/src/main/java/org/booklore/model/entity/AuthorEntity.java

@@ -2,6 +2,7 @@
 
 import jakarta.persistence.*;
 import lombok.*;
+import org.hibernate.Hibernate;
 import org.hibernate.annotations.BatchSize;
 
 import java.util.HashSet;
@@ -48,14 +49,15 @@ public class AuthorEntity {
     private Set<BookMetadataEntity> bookMetadataEntityList = new HashSet<>();
 
     @Override
-    public boolean equals(Object o) {
+    public final boolean equals(Object o) {
         if (this == o) return true;
-        if (!(o instanceof AuthorEntity that)) return false;
-        return id != null && Objects.equals(id, that.id);
+        if (o == null || Hibernate.getClass(this) != Hibernate.getClass(o)) return false;
+        AuthorEntity that = (AuthorEntity) o;
+        return getId() != null && Objects.equals(getId(), that.getId());
     }
 
     @Override
-    public int hashCode() {
-        return getClass().hashCode();
+    public final int hashCode() {
+        return Hibernate.getClass(this).hashCode();
     }
 }

backend/src/main/java/org/booklore/model/entity/BookEntity.java

@@ -5,6 +5,7 @@
 import org.booklore.convertor.BookRecommendationIdsListConverter;
 import org.booklore.model.dto.BookRecommendationLite;
 import org.booklore.model.enums.BookFileType;
+import org.hibernate.Hibernate;
 import org.hibernate.annotations.BatchSize;
 import org.hibernate.annotations.LazyGroup;
 
@@ -14,6 +15,7 @@
 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.List;
+import java.util.Objects;
 import java.util.Set;
 
 @Entity
@@ -131,4 +133,17 @@ public BookFileEntity getPrimaryBookFile() {
     public boolean hasFiles() {
         return bookFiles != null && !bookFiles.isEmpty();
     }
+
+    @Override
+    public final boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || Hibernate.getClass(this) != Hibernate.getClass(o)) return false;
+        BookEntity that = (BookEntity) o;
+        return getId() != null && Objects.equals(getId(), that.getId());
+    }
+
+    @Override
+    public final int hashCode() {
+        return Hibernate.getClass(this).hashCode();
+    }
 }

backend/src/main/java/org/booklore/model/entity/BookLoreUserEntity.java

@@ -65,11 +65,7 @@ public class BookLoreUserEntity {
 
     @BatchSize(size = 20)
     @ManyToMany(fetch = FetchType.LAZY)
-    @JoinTable(
-            name = "user_library_mapping",
-            joinColumns = @JoinColumn(name = "user_id"),
-            inverseJoinColumns = @JoinColumn(name = "library_id")
-    )
+    @JoinTable(name = "user_library_mapping", joinColumns = @JoinColumn(name = "user_id"), inverseJoinColumns = @JoinColumn(name = "library_id"))
     @Builder.Default
     private Set<LibraryEntity> libraries = new HashSet<>();
 
@@ -97,15 +93,15 @@ public void prePersist() {
     }
 
     @Override
-    public boolean equals(Object o) {
+    public final boolean equals(Object o) {
         if (this == o) return true;
         if (o == null || Hibernate.getClass(this) != Hibernate.getClass(o)) return false;
         BookLoreUserEntity that = (BookLoreUserEntity) o;
-        return id != null && Objects.equals(id, that.id);
+        return getId() != null && Objects.equals(getId(), that.getId());
     }
 
     @Override
-    public int hashCode() {
+    public final int hashCode() {
         return Hibernate.getClass(this).hashCode();
     }
 }

backend/src/main/java/org/booklore/model/entity/CategoryEntity.java

@@ -2,6 +2,7 @@
 
 import jakarta.persistence.*;
 import lombok.*;
+import org.hibernate.Hibernate;
 import org.hibernate.annotations.BatchSize;
 
 import java.util.HashSet;
@@ -30,15 +31,16 @@ public class CategoryEntity {
     private Set<BookMetadataEntity> bookMetadataEntityList = new HashSet<>();
 
     @Override
-    public boolean equals(Object o) {
+    public final boolean equals(Object o) {
         if (this == o) return true;
-        if (!(o instanceof CategoryEntity that)) return false;
-        return id != null && Objects.equals(id, that.id);
+        if (o == null || Hibernate.getClass(this) != Hibernate.getClass(o)) return false;
+        CategoryEntity that = (CategoryEntity) o;
+        return getId() != null && Objects.equals(getId(), that.getId());
     }
 
     @Override
-    public int hashCode() {
-        return getClass().hashCode();
+    public final int hashCode() {
+        return Hibernate.getClass(this).hashCode();
     }
 }
 

backend/src/main/java/org/booklore/model/entity/LibraryEntity.java

@@ -9,6 +9,7 @@
 import org.booklore.model.enums.MetadataSource;
 import jakarta.persistence.*;
 import lombok.*;
+import org.hibernate.Hibernate;
 import org.hibernate.annotations.BatchSize;
 import java.util.*;
 
@@ -75,15 +76,16 @@ public class LibraryEntity {
     private MetadataSource metadataSource = MetadataSource.EMBEDDED;
 
     @Override
-    public boolean equals(Object o) {
+    public final boolean equals(Object o) {
         if (this == o) return true;
-        if (!(o instanceof LibraryEntity that)) return false;
-        return id != null && Objects.equals(id, that.id);
+        if (o == null || Hibernate.getClass(this) != Hibernate.getClass(o)) return false;
+        LibraryEntity that = (LibraryEntity) o;
+        return getId() != null && Objects.equals(getId(), that.getId());
     }
 
     @Override
-    public int hashCode() {
-        return getClass().hashCode();
+    public final int hashCode() {
+        return Hibernate.getClass(this).hashCode();
     }
 
 }

backend/src/main/java/org/booklore/model/entity/MoodEntity.java

@@ -2,6 +2,7 @@
 
 import jakarta.persistence.*;
 import lombok.*;
+import org.hibernate.Hibernate;
 import org.hibernate.annotations.BatchSize;
 
 import java.util.HashSet;
@@ -30,15 +31,16 @@ public class MoodEntity {
     private Set<BookMetadataEntity> bookMetadataEntityList = new HashSet<>();
 
     @Override
-    public boolean equals(Object o) {
+    public final boolean equals(Object o) {
         if (this == o) return true;
-        if (!(o instanceof MoodEntity that)) return false;
-        return id != null && Objects.equals(id, that.id);
+        if (o == null || Hibernate.getClass(this) != Hibernate.getClass(o)) return false;
+        MoodEntity that = (MoodEntity) o;
+        return getId() != null && Objects.equals(getId(), that.getId());
     }
 
     @Override
-    public int hashCode() {
-        return getClass().hashCode();
+    public final int hashCode() {
+        return Hibernate.getClass(this).hashCode();
     }
 }
 

backend/src/main/java/org/booklore/model/entity/ShelfEntity.java

@@ -5,18 +5,19 @@
 import org.booklore.convertor.SortConverter;
 import org.booklore.model.dto.Sort;
 import org.booklore.model.enums.IconType;
+import org.hibernate.Hibernate;
 import org.hibernate.annotations.BatchSize;
 import org.hibernate.annotations.Formula;
 
 import java.util.HashSet;
+import java.util.Objects;
 import java.util.Set;
 
 @Getter
 @Setter
 @Builder
 @AllArgsConstructor
 @NoArgsConstructor
-@EqualsAndHashCode(of = "id")
 @Entity
 @Table(name = "shelf")
 public class ShelfEntity {
@@ -57,4 +58,17 @@ public class ShelfEntity {
     )
     @Builder.Default
     private Set<BookEntity> bookEntities = new HashSet<>();
+
+    @Override
+    public final boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || Hibernate.getClass(this) != Hibernate.getClass(o)) return false;
+        ShelfEntity that = (ShelfEntity) o;
+        return getId() != null && Objects.equals(getId(), that.getId());
+    }
+
+    @Override
+    public final int hashCode() {
+        return Hibernate.getClass(this).hashCode();
+    }
 }

backend/src/main/java/org/booklore/model/entity/TagEntity.java

@@ -2,6 +2,7 @@
 
 import jakarta.persistence.*;
 import lombok.*;
+import org.hibernate.Hibernate;
 import org.hibernate.annotations.BatchSize;
 
 import java.util.HashSet;
@@ -30,14 +31,15 @@ public class TagEntity {
     private Set<BookMetadataEntity> bookMetadataEntityList = new HashSet<>();
 
     @Override
-    public boolean equals(Object o) {
+    public final boolean equals(Object o) {
         if (this == o) return true;
-        if (!(o instanceof TagEntity that)) return false;
-        return id != null && Objects.equals(id, that.id);
+        if (o == null || Hibernate.getClass(this) != Hibernate.getClass(o)) return false;
+        TagEntity that = (TagEntity) o;
+        return getId() != null && Objects.equals(getId(), that.getId());
     }
 
     @Override
-    public int hashCode() {
-        return getClass().hashCode();
+    public final int hashCode() {
+        return Hibernate.getClass(this).hashCode();
     }
 }