pagination & validation for GET entity partner

build.gradle

@@ -21,12 +21,16 @@ repositories {
 
 ext {
     set('snippetsDir', file("build/generated-snippets"))
+    // Added depedencies version after spring init
+    gsonVersion = '2.8.9'
 }
 
 dependencies {
     implementation 'org.springframework.boot:spring-boot-starter-actuator'
     implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
     implementation 'org.springframework.boot:spring-boot-starter-web'
+    implementation 'org.springframework.boot:spring-boot-starter-validation'
+
     compileOnly 'org.projectlombok:lombok'
     developmentOnly 'org.springframework.boot:spring-boot-devtools'
     runtimeOnly 'com.h2database:h2'
@@ -35,7 +39,7 @@ dependencies {
     testImplementation 'org.springframework.restdocs:spring-restdocs-mockmvc'
 
     // Added after spring init
-    implementation 'com.google.code.gson:gson:2.8.9'
+    implementation "com.google.code.gson:gson:$gsonVersion"
 
 }
 

src/main/java/com/example/apispringgradleb2boost/controller/PartnerController.java

@@ -5,32 +5,41 @@ import com.example.apispringgradleb2boost.model.Partner;
 import com.example.apispringgradleb2boost.service.PartnerService;
 
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.repository.query.Param;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
+import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
 import com.google.gson.Gson;
 
 import javax.servlet.http.HttpServletResponse;
+import javax.validation.constraints.Min;
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.util.Optional;
 
 @RestController
+@Validated
 public class PartnerController {
 
     @Autowired
     PartnerService partnerService;
 
     @GetMapping("/partners")
-    public Iterable<Partner> getPartners() {
+    public Iterable<Partner> getPartners(@Param("from") @Min(0) final Integer from, @Param("size") @Min(1) final Integer size) {
+        if (from != null && size != null) {
+            return partnerService.getPartners(from, size);
+        }
         return partnerService.getPartners();
     }
 
     @GetMapping("/partner/{id}")
-    public Partner getPartnerById(@PathVariable("id") final Long Id, HttpServletResponse response) throws IOException {
+    public Partner getPartnerById(@PathVariable("id") @Min(1) final Long Id, HttpServletResponse response) throws IOException {
 
         Optional<Partner> partner = partnerService.getPartnerById(Id);
         if (partner.isPresent()) {

src/main/java/com/example/apispringgradleb2boost/service/PartnerService.java

@@ -4,8 +4,12 @@ import com.example.apispringgradleb2boost.model.Partner;
 import com.example.apispringgradleb2boost.repository.PartnerRepository;
 import lombok.Data;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Pageable;
 import org.springframework.stereotype.Service;
 
+
 import java.util.Optional;
 
 @Data
@@ -16,11 +20,16 @@ public class PartnerService {
     @Autowired
     private PartnerRepository partnerRepository;
 
-    public Iterable<Partner> getPartners(){
+    public Iterable<Partner> getPartners() {
         return partnerRepository.findAll();
     }
 
-    public Optional<Partner> getPartnerById(Long Id){
+    public Iterable<Partner> getPartners(int from, int size) {
+        Pageable pageable = PageRequest.of(from, size);
+        return partnerRepository.findAll(pageable);
+    }
+
+    public Optional<Partner> getPartnerById(Long Id) {
         return partnerRepository.findById(Id);
     }
 }

src/main/resources/data.sql

@@ -1,4 +1,13 @@
 INSERT INTO partners (company_name, ref, locale, expires)
 VALUES ('B2boost', 'FYI1', 'en_BE', TIMESTAMP '2022-05-23 12:18:46'),
-       ('Spotify', 'FYI2', 'en_GB', TIMESTAMP '2022-05-23 12:18:46'),
+       ('Proximus', 'FYI2', 'en_BE', TIMESTAMP '2022-05-23 12:18:46'),
-       ('AMSOM-Habitat', 'FYI3', 'fr_FR', TIMESTAMP '2022-05-23 12:18:46');
+       ('KBC Bank', 'FYI3', 'en_BE', TIMESTAMP '2022-05-23 12:18:46'),
+       ('AB InBev', 'FYI4', 'en_BE', TIMESTAMP '2022-05-23 12:18:46'),
+       ('Spotify', 'FYI5', 'sv_SE', TIMESTAMP '2022-05-23 12:18:46'),
+       ('AMSOM-Habitat', 'FYI6', 'fr_FR', TIMESTAMP '2022-05-23 12:18:46'),
+       ('Microsoft', 'FYI7', 'en_US', TIMESTAMP '2022-05-23 12:18:46'),
+       ('Sony', 'FYI8', 'ja_JP', TIMESTAMP '2022-05-23 12:18:46'),
+       ('Intel', 'FYI9', 'en_US', TIMESTAMP '2022-05-23 12:18:46'),
+       ('Cisco', 'FYI10', 'en_US', TIMESTAMP '2022-05-23 12:18:46'),
+       ('Dell', 'FYI11', 'en_US', TIMESTAMP '2022-05-23 12:18:46'),
+       ('Canonical', 'FYI12', 'en_US', TIMESTAMP '2022-05-23 12:18:46');