added spring-rest-hal-browser code (#4701)

spring-rest-hal-browser/pom.xml

@@ -0,0 +1,53 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>com.baeldung</groupId>
+  <artifactId>spring-rest-hal-browser</artifactId>
+  <version>1.0-SNAPSHOT</version>
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <configuration>
+          <source>1.8</source>
+          <target>1.8</target>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+
+  <dependencies>
+    <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-web</artifactId>
+      <version>2.0.3.RELEASE</version>
+    </dependency>
+    <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-data-jpa -->
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-data-jpa</artifactId>
+      <version>2.0.3.RELEASE</version>
+    </dependency>
+    <!-- https://mvnrepository.com/artifact/org.springframework.data/spring-data-rest-hal-browser -->
+    <dependency>
+      <groupId>org.springframework.data</groupId>
+      <artifactId>spring-data-rest-hal-browser</artifactId>
+      <version>3.0.8.RELEASE</version>
+    </dependency>
+    <!-- https://mvnrepository.com/artifact/com.h2database/h2 -->
+    <dependency>
+      <groupId>com.h2database</groupId>
+      <artifactId>h2</artifactId>
+      <version>1.4.197</version>
+    </dependency>
+
+
+  </dependencies>
+
+
+</project>

spring-rest-hal-browser/src/main/java/com/baeldung/App.java

@@ -0,0 +1,13 @@
+package com.baeldung;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class App {
+
+  public static void main(String[] args) {
+    SpringApplication.run(App.class);
+  }
+
+}

spring-rest-hal-browser/src/main/java/com/baeldung/config/DBLoader.java

@@ -0,0 +1,108 @@
+package com.baeldung.config;
+
+import com.baeldung.data.BookRepository;
+import com.baeldung.model.Book;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.ApplicationArguments;
+import org.springframework.boot.ApplicationRunner;
+import org.springframework.stereotype.Component;
+
+import java.util.Random;
+import java.util.stream.IntStream;
+
+@Component
+public class DBLoader implements ApplicationRunner {
+
+  private final BookRepository bookRepository;
+
+  @Autowired
+  DBLoader(BookRepository bookRepository){
+    this.bookRepository = bookRepository;
+  }
+
+
+  public void run(ApplicationArguments applicationArguments) throws Exception {
+
+     String[] templates = {
+       "Up and running with %s",
+       "%s Basics",
+       "%s for Beginners",
+       "%s for Neckbeards",
+       "Under the hood: %s",
+       "Discovering %s",
+       "A short guide to %s",
+       "%s with Baeldung"
+     };
+
+     String[] buzzWords = {
+       "Spring REST Data",
+       "Java 9",
+       "Scala",
+       "Groovy",
+       "Hibernate",
+       "Spring HATEOS",
+       "The HAL Browser",
+       "Spring webflux",
+     };
+
+     String[] authorFirstName = {
+       "John %s",
+       "Steve %s",
+       "Samantha %s",
+       "Gale %s",
+       "Tom %s"
+     };
+
+     String[] authorLastName = {
+       "Giles",
+       "Gill",
+       "Smith",
+       "Armstrong"
+     };
+
+     String[] blurbs = {
+       "It was getting dark when the %s %s" ,
+       "Scott was nearly there when he heard that a %s %s",
+       "Diana was a lovable Java coder until the %s %s",
+       "The gripping story of a small %s and the day it %s"
+     };
+
+     String[] blublMiddles = {
+       "distaster",
+       "dog",
+       "cat",
+       "turtle",
+       "hurricane"
+     };
+
+     String[] end = {
+       "hit the school",
+       "memorised pi to 100 decimal places!",
+       "became a world champion armwrestler",
+       "became a Java REST master!!"
+     };
+
+     Random random = new Random();
+
+     IntStream.range(0, 100)
+       .forEach(i -> {
+         String template = templates[i % templates.length];
+         String buzzword = buzzWords[i % buzzWords.length];
+         String blurbStart = blurbs[i % blurbs.length];
+         String middle = blublMiddles[i % blublMiddles.length];
+         String ending = end[i % end.length];
+         String blurb = String.format(blurbStart, middle, ending);
+         String firstName = authorFirstName[i % authorFirstName.length];
+         String lastname = authorLastName[i % authorLastName.length];
+         Book book = new Book(String.format(template, buzzword), String.format(firstName, lastname), blurb, random.nextInt(1000-200) + 200);
+
+         bookRepository.save(book);
+
+         System.out.println(book);
+
+       });
+
+
+
+  }
+}

spring-rest-hal-browser/src/main/java/com/baeldung/config/RestConfig.java

@@ -0,0 +1,23 @@
+package com.baeldung.config;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Lazy;
+import org.springframework.data.rest.core.event.ValidatingRepositoryEventListener;
+import org.springframework.data.rest.webmvc.config.RepositoryRestConfigurerAdapter;
+import org.springframework.validation.Validator;
+
+@Configuration
+public class RestConfig extends RepositoryRestConfigurerAdapter {
+
+  //access to global validator
+  @Autowired
+  @Lazy
+  private Validator validator;
+
+  @Override
+  public void configureValidatingRepositoryEventListener(ValidatingRepositoryEventListener validatingListener) {
+    validatingListener.addValidator("beforeCreate", validator );
+    validatingListener.addValidator("beforeSave", validator);
+  }
+}

spring-rest-hal-browser/src/main/java/com/baeldung/data/BookRepository.java

@@ -0,0 +1,21 @@
+package com.baeldung.data;
+
+import com.baeldung.model.Book;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.PagingAndSortingRepository;
+import org.springframework.data.repository.query.Param;
+import org.springframework.data.rest.core.annotation.RestResource;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface BookRepository extends PagingAndSortingRepository<Book, Long> {
+
+  @RestResource(rel = "title-contains", path="title-contains")
+  Page<Book> findByTitleContaining(@Param("query") String query, Pageable page);
+
+  @RestResource(rel = "author-contains", path="author-contains", exported = false)
+  Page<Book> findByAuthorContaining(@Param("query") String query, Pageable page);
+
+}

spring-rest-hal-browser/src/main/java/com/baeldung/model/Book.java

@@ -0,0 +1,86 @@
+package com.baeldung.model;
+
+import javax.persistence.*;
+import javax.validation.constraints.NotNull;
+
+@Entity
+public class Book {
+
+  @Id
+  @GeneratedValue(strategy = GenerationType.IDENTITY)
+  private long id;
+
+  @NotNull
+  @Column(columnDefinition = "VARCHAR", length = 100)
+  private String title;
+
+  @NotNull
+  @Column(columnDefinition = "VARCHAR", length = 100)
+  private String author;
+
+  @Column(columnDefinition = "VARCHAR", length = 1000)
+  private String blurb;
+
+  private int pages;
+
+  public Book() {
+  }
+
+  public Book(@NotNull String title, @NotNull String author, String blurb, int pages) {
+    this.title = title;
+    this.author = author;
+    this.blurb = blurb;
+    this.pages = pages;
+  }
+
+  public long getId() {
+    return id;
+  }
+
+  public void setId(long id) {
+    this.id = id;
+  }
+
+  public String getTitle() {
+    return title;
+  }
+
+  public void setTitle(String title) {
+    this.title = title;
+  }
+
+  public String getAuthor() {
+    return author;
+  }
+
+  public void setAuthor(String author) {
+    this.author = author;
+  }
+
+  public String getBlurb() {
+    return blurb;
+  }
+
+  public void setBlurb(String blurb) {
+    this.blurb = blurb;
+  }
+
+  public int getPages() {
+    return pages;
+  }
+
+  public void setPages(int pages) {
+    this.pages = pages;
+  }
+
+  @Override
+  public String toString() {
+    return "Book{" +
+      "id=" + id +
+      ", title='" + title + '\'' +
+      ", author='" + author + '\'' +
+      ", blurb='" + blurb + '\'' +
+      ", pages=" + pages +
+      '}';
+  }
+}