Books entty, repository, manager and tests

Author: hhimanshu

src/main/java/com/hhimanshu/business/BooksManager.java

@@ -0,0 +1,23 @@
+package com.hhimanshu.business;
+
+import com.hhimanshu.persistence.entities.Book;
+import com.hhimanshu.persistence.repositories.BookRepository;
+import java.util.stream.Stream;
+import java.util.stream.StreamSupport;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+@Component
+public class BooksManager {
+
+  private BookRepository bookRepository;
+
+  @Autowired
+  public BooksManager(BookRepository bookRepository) {
+    this.bookRepository = bookRepository;
+  }
+
+  public Stream<Book> getAllBooks() {
+    return StreamSupport.stream(bookRepository.findAll().spliterator(), true);
+  }
+}

src/main/java/com/hhimanshu/persistence/entities/Author.java

@@ -5,8 +5,10 @@
 import javax.persistence.GeneratedValue;
 import javax.persistence.GenerationType;
 import javax.persistence.Id;
+import javax.persistence.Table;
 
-@Entity(name = "authors")
+@Entity
+@Table(name = "authors")
 public class Author {
 
   @Id

src/main/java/com/hhimanshu/persistence/entities/Book.java

@@ -0,0 +1,57 @@
+package com.hhimanshu.persistence.entities;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.ManyToOne;
+import javax.persistence.Table;
+
+@Entity
+@Table(name = "books")
+public class Book {
+
+  @Id
+  @GeneratedValue(strategy = GenerationType.AUTO)
+  private int id;
+
+  @Column(nullable = false, unique = true)
+  private String name;
+
+  @ManyToOne
+  @JoinColumn(name = "author")
+  private Author author;
+
+  protected Book() {
+    // for JPA
+  }
+
+  public Book(int id, String name, Author author) {
+    this.id = id;
+    this.name = name;
+    this.author = author;
+  }
+
+  public int getId() {
+    return id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public Author getAuthor() {
+    return author;
+  }
+
+  @Override
+  public String toString() {
+    return "Book{" +
+        "id=" + id +
+        ", name='" + name + '\'' +
+        ", author=" + author +
+        '}';
+  }
+}

src/main/java/com/hhimanshu/persistence/repositories/BookRepository.java

@@ -0,0 +1,8 @@
+package com.hhimanshu.persistence.repositories;
+
+import com.hhimanshu.persistence.entities.Book;
+import org.springframework.data.repository.CrudRepository;
+
+public interface BookRepository extends CrudRepository<Book, Integer> {
+
+}

src/test/java/com/hhimanshu/business/BooksManagerTest.java

@@ -0,0 +1,32 @@
+package com.hhimanshu.business;
+
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+
+import com.hhimanshu.persistence.entities.Book;
+import java.util.List;
+import java.util.stream.Collectors;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class BooksManagerTest {
+
+  @Autowired
+  private BooksManager booksManager;
+
+  @Test
+  public void getAllBooksReturnsDataFromDatabase() throws Exception {
+    List<Book> books = booksManager.getAllBooks().collect(Collectors.toList());
+    assertFalse(books.isEmpty());
+    assertEquals(5, books.size());
+
+    // If you want to compare all the authors to what we inserted in '02-insert-data-authors.xml'
+    books.forEach(System.out::println);
+  }
+}