Add Article service and DAO with criteria-based search functionality

hibernate-project/src/main/java/com/humanbooster/App.java

@@ -1,8 +1,10 @@
 package com.humanbooster;
 
+import com.humanbooster.dao.ArticleDao;
 import com.humanbooster.dao.UserDao;
 import com.humanbooster.model.Article;
 import com.humanbooster.model.User;
+import com.humanbooster.service.ArticleService;
 import com.humanbooster.service.UserService;
 import org.hibernate.SessionFactory;
 import org.hibernate.boot.Metadata;
@@ -32,10 +34,22 @@ public class App {
         ));
 
         UserService userService = new UserService(new UserDao(sessionFactory));
+        ArticleService articleService = new ArticleService(new ArticleDao(sessionFactory));
 
         List<User> existingUsers = userService.getAllUsers();
         existingUsers.forEach(u -> userService.deleteUser(u.getId()));
 
         userService.createUser(user);
+
+        List<Article> articles = articleService.findArticlesByCriteria("test", 3L);
+
+        articles.forEach(article -> {
+                    System.out.println("\nArticle trouvé :");
+                    System.out.println("ID: " + article.getId());
+                    System.out.println("Titre: " + article.getTitle());
+                    System.out.println("Contenu: " + article.getContent());
+                    System.out.println("Auteur: " + article.getAuthor().getName());
+                }
+        );
     }
 }

hibernate-project/src/main/java/com/humanbooster/dao/ArticleDao.java

@@ -1,9 +1,14 @@
 package com.humanbooster.dao;
 
 import com.humanbooster.model.Article;
+import jakarta.persistence.criteria.CriteriaBuilder;
+import jakarta.persistence.criteria.CriteriaQuery;
 import org.hibernate.Session;
 import org.hibernate.SessionFactory;
 
+import java.util.List;
+import java.util.Optional;
+
 public class ArticleDao extends GenericDaoImpl<Article, Long> {
 
     public ArticleDao(SessionFactory sessionFactory) {
@@ -31,4 +36,38 @@ public class ArticleDao extends GenericDaoImpl<Article,Long> {
             return article;
         }
     }
+
+    public List<Article> findByCriteria(String keyword, Long authorId) {
+
+        Optional<String> optKeyword = Optional.ofNullable(keyword);
+        Optional<Long> optAuthorId = Optional.ofNullable(authorId);
+
+        List<Article> articles;
+
+        try (Session session = sessionFactory.openSession()) {
+            session.beginTransaction();
+
+            CriteriaBuilder cb = session.getCriteriaBuilder();
+            CriteriaQuery<Article> query = cb.createQuery(Article.class);
+
+            var root = query.from(Article.class);
+
+            query.select(root);
+
+            optKeyword.ifPresent(s -> query.where(
+                    cb.like(
+                            cb.lower(
+                                    root.get("title")), "%" + s.toLowerCase() + "%")
+            ));
+
+            optAuthorId.ifPresent(l -> query.where(
+                    cb.equal(
+                            root.get("author"), l)
+
+            ));
+
+            articles = session.createQuery(query).getResultList();
+        }
+        return articles;
+    }
 }

hibernate-project/src/main/java/com/humanbooster/model/Article.java

@@ -1,7 +1,6 @@
 package com.humanbooster.model;
 
 import jakarta.persistence.*;
-import org.jetbrains.annotations.NotNull;
 
 @Entity
 public class Article {

hibernate-project/src/main/java/com/humanbooster/service/ArticleService.java

@@ -4,6 +4,7 @@ import com.humanbooster.dao.ArticleDao;
 import com.humanbooster.model.Article;
 
 import java.util.List;
+import java.util.Optional;
 
 public class ArticleService {
 
@@ -40,4 +41,8 @@ public class ArticleService {
     public Article findArticleByTitle(String title) {
         return articleDao.findByTitle(title);
     }
+
+    public List<Article> findArticlesByCriteria(String keyword, Long authorId) {
+        return articleDao.findByCriteria(keyword, authorId);
+    }
 }