Pair demo

Author: Somnath More

backend/HELP.md

@@ -7,15 +7,16 @@ For further reference, please consider the following sections:
 * [Spring Boot Maven Plugin Reference Guide](https://docs.spring.io/spring-boot/docs/3.2.2/maven-plugin/reference/html/)
 * [Create an OCI image](https://docs.spring.io/spring-boot/docs/3.2.2/maven-plugin/reference/html/#build-image)
 * [Spring Web](https://docs.spring.io/spring-boot/docs/3.2.2/reference/htmlsingle/index.html#web)
-* [Spring Boot DevTools](https://docs.spring.io/spring-boot/docs/3.2.2/reference/htmlsingle/index.html#using.devtools)
 * [Spring Data JPA](https://docs.spring.io/spring-boot/docs/3.2.2/reference/htmlsingle/index.html#data.sql.jpa-and-spring-data)
+* [Validation](https://docs.spring.io/spring-boot/docs/3.2.2/reference/htmlsingle/index.html#io.validation)
 
 ### Guides
 The following guides illustrate how to use some features concretely:
 
 * [Building a RESTful Web Service](https://spring.io/guides/gs/rest-service/)
 * [Serving Web Content with Spring MVC](https://spring.io/guides/gs/serving-web-content/)
 * [Building REST services with Spring](https://spring.io/guides/tutorials/rest/)
-* [Accessing data with MySQL](https://spring.io/guides/gs/accessing-data-mysql/)
 * [Accessing Data with JPA](https://spring.io/guides/gs/accessing-data-jpa/)
+* [Accessing data with MySQL](https://spring.io/guides/gs/accessing-data-mysql/)
+* [Validation](https://spring.io/guides/gs/validating-form-input/)
 

backend/README.md

@@ -8,7 +8,7 @@
 		<version>3.2.2</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>
-	<groupId>com.reactpairdemo</groupId>
+	<groupId>com.pairdemo</groupId>
 	<artifactId>demo</artifactId>
 	<version>0.0.1-SNAPSHOT</version>
 	<name>demo</name>
@@ -22,34 +22,19 @@
 			<artifactId>modelmapper</artifactId>
 			<version>3.1.1</version>
 		</dependency>
-		<dependency>
-			<groupId>org.slf4j</groupId>
-			<artifactId>jul-to-slf4j</artifactId>
-		</dependency>
-
-<!--		<dependency>-->
-<!--			<groupId>org.springframework.boot</groupId>-->
-<!--			<artifactId>spring-boot-starter-security</artifactId>-->
-<!--		</dependency>-->
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
-			<artifactId>spring-boot-starter-validation</artifactId>
+			<artifactId>spring-boot-starter-data-jpa</artifactId>
 		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
-			<artifactId>spring-boot-starter-data-jpa</artifactId>
+			<artifactId>spring-boot-starter-validation</artifactId>
 		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-web</artifactId>
 		</dependency>
 
-		<dependency>
-			<groupId>org.springframework.boot</groupId>
-			<artifactId>spring-boot-devtools</artifactId>
-			<scope>runtime</scope>
-			<optional>true</optional>
-		</dependency>
 		<dependency>
 			<groupId>com.mysql</groupId>
 			<artifactId>mysql-connector-j</artifactId>

backend/pom.xml

@@ -1,4 +1,4 @@
-package com.reactpairdemo.demo;
+package com.pairdemo.demo;
 
 import org.modelmapper.ModelMapper;
 import org.springframework.boot.SpringApplication;
@@ -11,9 +11,10 @@ public class DemoApplication {
 	public static void main(String[] args) {
 		SpringApplication.run(DemoApplication.class, args);
 	}
+
 	@Bean
-    public ModelMapper modelMapper() {
-        return new ModelMapper();
-    }
+	public ModelMapper modelMapper(){
+		return new ModelMapper();
+	}
 
 }

backend/src/main/java/com/reactpairdemo/demo/DemoApplication.java renamed to backend/src/main/java/com/pairdemo/demo/DemoApplication.java

@@ -0,0 +1,34 @@
+package com.pairdemo.demo.controller;
+
+import com.pairdemo.demo.dto.ProductDto;
+import com.pairdemo.demo.entity.Product;
+import com.pairdemo.demo.service.ProductService;
+import jakarta.validation.Valid;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+import static com.pairdemo.demo.utils.Constants.BASE_URL;
+
+@RestController
+@RequestMapping(BASE_URL)
+public class ProductController {
+
+
+    @Autowired
+    private ProductService productService;
+    @GetMapping("/search")
+    public ResponseEntity<List<ProductDto>> searchProductByName(@RequestParam("name") String name) {
+        return new ResponseEntity<>(productService.searchProductByName(name), HttpStatus.OK) ;
+    }
+
+    @PostMapping
+    public ResponseEntity<ProductDto> createProduct(@Valid @RequestBody ProductDto productDto) {
+
+        return new ResponseEntity<>(productService.createProduct(productDto), HttpStatus.CREATED) ;
+    }
+
+}

backend/src/main/java/com/pairdemo/demo/controller/ProductController.java

@@ -0,0 +1,16 @@
+package com.pairdemo.demo.dto;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Size;
+import lombok.Data;
+
+@Data
+public class ProductDto {
+    private Long id;
+    @NotBlank(message = "Please enter a name")
+    @Size(min = 3,message = "")
+    private String name;
+    @NotNull(message = "Please enter a price")
+    private Double Price;
+}

backend/src/main/java/com/pairdemo/demo/dto/ProductDto.java

@@ -0,0 +1,18 @@
+package com.pairdemo.demo.entity;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import lombok.Data;
+
+@Entity
+@Data
+public class Product {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+
+    private Long id;
+    private String name;
+    private Double Price;
+}

backend/src/main/java/com/pairdemo/demo/entity/Product.java

@@ -0,0 +1,11 @@
+package com.pairdemo.demo.exceptions;
+
+import lombok.Builder;
+import lombok.Data;
+
+@Data
+@Builder
+public class ErrorResponse {
+    String message;
+    String title;
+}

backend/src/main/java/com/pairdemo/demo/exceptions/ErrorResponse.java

@@ -0,0 +1,39 @@
+package com.pairdemo.demo.exceptions;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.validation.FieldError;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+import java.util.HashMap;
+import java.util.Map;
+
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+
+    @ExceptionHandler(ResourceNotFoundException.class)
+    public ResponseEntity<ErrorResponse> handleResourceNotFound(Exception e){
+        ErrorResponse errorResponse=ErrorResponse.builder().message(e.getMessage()).title(HttpStatus.NOT_FOUND.getReasonPhrase()).build();
+        return new ResponseEntity<>(errorResponse,HttpStatus.NOT_FOUND);
+    }
+
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public ResponseEntity<Map<String,String>> handleResourceNotFound(MethodArgumentNotValidException e){
+        Map<String,String> resp=new HashMap<>();
+        e.getBindingResult().getAllErrors().forEach(objectError -> {
+            resp.put(((FieldError)objectError).getField(),objectError.getDefaultMessage());
+        });
+
+
+        return new ResponseEntity<>(resp,HttpStatus.BAD_REQUEST);
+    }
+
+    @ExceptionHandler(IllegalArgumentException.class)
+    public ResponseEntity<ErrorResponse> handleIllegalArgumentException(IllegalArgumentException e){
+        ErrorResponse errorResponse=ErrorResponse.builder().message(e.getMessage()).title(HttpStatus.NOT_ACCEPTABLE.getReasonPhrase()).build();
+        return new ResponseEntity<>(errorResponse,HttpStatus.NOT_ACCEPTABLE);
+    }
+
+}

backend/src/main/java/com/pairdemo/demo/exceptions/GlobalExceptionHandler.java

@@ -0,0 +1,7 @@
+package com.pairdemo.demo.exceptions;
+
+public class ResourceNotFoundException extends RuntimeException{
+    public ResourceNotFoundException(String message) {
+        super(message);
+    }
+}