Validate objects for PUT and POST methods

Author: Denis-san

pom.xml

@@ -43,6 +43,10 @@
 			<artifactId>spring-boot-devtools</artifactId>
 		</dependency>
 
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-validation</artifactId>
+		</dependency>
 	</dependencies>
 
 	<build>

src/main/java/com/dsan/springrestapicourse/dto/CategoryDTO.java

@@ -2,23 +2,29 @@
 
 import java.io.Serializable;
 
+import javax.validation.constraints.NotEmpty;
+
+import org.hibernate.validator.constraints.Length;
+
 import com.dsan.springrestapicourse.domain.Category;
 
 public class CategoryDTO implements Serializable {
 	private static final long serialVersionUID = 1L;
 
 	private Integer id;
+
+	@NotEmpty
+	@Length(min = 5, max = 80)
 	private String name;
 
 	public CategoryDTO() {
 
 	}
-	
+
 	public CategoryDTO(Category category) {
 		id = category.getId();
 		name = category.getName();
 	}
-	
 
 	public Integer getId() {
 		return id;
@@ -36,4 +42,8 @@ public void setName(String name) {
 		this.name = name;
 	}
 
+	public Category toCategory() {
+		return new Category(id, name);
+	}
+
 }

src/main/java/com/dsan/springrestapicourse/resources/CategoryResource.java

@@ -4,6 +4,8 @@
 import java.util.List;
 import java.util.stream.Collectors;
 
+import javax.validation.Valid;
+
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.data.domain.Page;
 import org.springframework.http.ResponseEntity;
@@ -36,17 +38,17 @@ public ResponseEntity<Category> find(@PathVariable Integer id) {
 	}
 
 	@PostMapping
-	public ResponseEntity<Void> insert(@RequestBody Category category) {
-		category = categoryService.insert(category);
-
-		URI uri = ServletUriComponentsBuilder.fromCurrentRequest().path("/{id}").buildAndExpand(category.getId())
-				.toUri();
+	public ResponseEntity<Void> insert(@Valid @RequestBody CategoryDTO categoryDto) {
+		Category category = categoryService.insert(categoryDto.toCategory());
+		URI uri = ServletUriComponentsBuilder.fromCurrentRequest().path("/{id}").
+				buildAndExpand(category.getId()).toUri();
 
 		return ResponseEntity.created(uri).build();
 	}
 
 	@PutMapping("/{id}")
-	public ResponseEntity<Void> update(@RequestBody Category category, @PathVariable Integer id) {
+	public ResponseEntity<Void> update(@Valid @RequestBody CategoryDTO categoryDto, @PathVariable Integer id) {
+		Category category = categoryDto.toCategory();
 		category.setId(id);
 		category = categoryService.update(category);
 		return ResponseEntity.noContent().build();
@@ -66,11 +68,10 @@ public ResponseEntity<List<CategoryDTO>> findAll() {
 	}
 
 	@GetMapping("/page")
-	public ResponseEntity<Page<CategoryDTO>> findPage(
-			@RequestParam(name = "page", defaultValue = "0") Integer page, 
-			@RequestParam(name = "linesPerPage", defaultValue = "24")Integer linesPerPages, 
-			@RequestParam(name = "orderBy", defaultValue = "name")String orderBy,
-			@RequestParam(name = "direction", defaultValue = "ASC")String direction) {
+	public ResponseEntity<Page<CategoryDTO>> findPage(@RequestParam(name = "page", defaultValue = "0") Integer page,
+			@RequestParam(name = "linesPerPage", defaultValue = "24") Integer linesPerPages,
+			@RequestParam(name = "orderBy", defaultValue = "name") String orderBy,
+			@RequestParam(name = "direction", defaultValue = "ASC") String direction) {
 		Page<Category> listCategory = categoryService.findPage(page, linesPerPages, orderBy, direction);
 		Page<CategoryDTO> listDTO = listCategory.map(e -> new CategoryDTO(e));
 		return ResponseEntity.ok().body(listDTO);

src/main/java/com/dsan/springrestapicourse/services/CategoryServiceImpl.java

@@ -62,5 +62,4 @@ public Page<Category> findPage(Integer page, Integer linesPerPages, String order
 		PageRequest pageRequest = PageRequest.of(page, linesPerPages, Direction.valueOf(direction), orderBy);
 		return categoryRepository.findAll(pageRequest);
 	}
-
 }