Refactor Article search functionality to support pagination and enhance output formatting

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

@@ -41,14 +41,8 @@ public class App {
 
         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());
+        articleService.findArticlesByCriteria("test", 3L, 1, 1).forEach(article -> {
+                    System.out.println("\nArticle trouvé :" + article.toString());
                 }
         );
     }

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

@@ -3,9 +3,12 @@ package com.humanbooster.dao;
 import com.humanbooster.model.Article;
 import jakarta.persistence.criteria.CriteriaBuilder;
 import jakarta.persistence.criteria.CriteriaQuery;
+import jakarta.persistence.criteria.Predicate;
+import jakarta.persistence.criteria.Root;
 import org.hibernate.Session;
 import org.hibernate.SessionFactory;
 
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;
 
@@ -37,37 +40,36 @@ public class ArticleDao extends GenericDaoImpl<Article, Long> {
         }
     }
 
-    public List<Article> findByCriteria(String keyword, Long authorId) {
-
-        Optional<String> optKeyword = Optional.ofNullable(keyword);
-        Optional<Long> optAuthorId = Optional.ofNullable(authorId);
-
-        List<Article> articles;
-
+    public List<Article> findByCriteria(String keyword, Long authorId, int page, int size) {
         try (Session session = sessionFactory.openSession()) {
-            session.beginTransaction();
 
             CriteriaBuilder cb = session.getCriteriaBuilder();
             CriteriaQuery<Article> query = cb.createQuery(Article.class);
 
-            var root = query.from(Article.class);
-
+            Root<Article> root = query.from(Article.class);
             query.select(root);
 
-            optKeyword.ifPresent(s -> query.where(
-                    cb.like(
-                            cb.lower(
-                                    root.get("title")), "%" + s.toLowerCase() + "%")
-            ));
+            List<Predicate> predicates = new ArrayList<>();
 
-            optAuthorId.ifPresent(l -> query.where(
-                    cb.equal(
-                            root.get("author"), l)
-
-            ));
-
-            articles = session.createQuery(query).getResultList();
+            if (keyword != null && !keyword.isEmpty()) {
+                predicates.add(
+                        cb.like(root.get("title"), "%" + keyword + "%")
+                );
+            }
+
+            if (authorId != null) {
+                predicates.add(
+                        cb.equal(root.get("author").get("id"), authorId)
+                );
+            }
+
+            query.where(predicates.toArray(Predicate[]::new));
+            query.orderBy(cb.asc(root.get("title")));
+
+            return session.createQuery(query)
+                    .setFirstResult(page * size)
+                    .setMaxResults(size)
+                    .getResultList();
         }
-        return articles;
     }
 }

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

@@ -58,4 +58,16 @@ public class Article {
     public void setAuthor(User author) {
         this.author = author;
     }
+
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+
+        sb.append("Article ID: ").append(id).append("\n");
+        sb.append("Title: ").append(title).append("\n");
+        sb.append("Content: ").append(content).append("\n");
+        sb.append("Author: ").append(author != null ? author.getName() : "Unknown").append("\n");
+
+        return sb.toString();
+    }
 }

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

@@ -4,7 +4,6 @@ import com.humanbooster.dao.ArticleDao;
 import com.humanbooster.model.Article;
 
 import java.util.List;
-import java.util.Optional;
 
 public class ArticleService {
 
@@ -42,7 +41,7 @@ public class ArticleService {
         return articleDao.findByTitle(title);
     }
 
-    public List<Article> findArticlesByCriteria(String keyword, Long authorId) {
-        return articleDao.findByCriteria(keyword, authorId);
+    public List<Article> findArticlesByCriteria(String keyword, Long authorId, int page, int size) {
+        return articleDao.findByCriteria(keyword, authorId, page, size);
     }
 }