4주차 : 고양이 장난감가게 만들기

app/src/main/java/com/codesoom/assignment/common/BaseException.java

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+package com.codesoom.assignment.common;
+
+import com.codesoom.assignment.common.dto.ErrorResponse;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public abstract class BaseException extends RuntimeException {
+    public final List<ErrorValidation> errors = new ArrayList<>();
+
+    public BaseException() {
+    }
+
+    public BaseException(String message) {
+        super(message);
+    }
+
+    public abstract int getStatusCode();
+
+    public void addValidation(String source, String type, String message) {
+        errors.add(new ErrorValidation(source, type, message));
+    }
+
+    public ErrorResponse toErrorResponse() {
+        return new ErrorResponse(
+                String.valueOf(getStatusCode()),
+                getMessage(),
+                errors
+        );
+    }
+}

app/src/main/java/com/codesoom/assignment/common/ErrorValidation.java

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+package com.codesoom.assignment.common;
+
+import lombok.Builder;
+import lombok.Getter;
+
+@Getter
+public class ErrorValidation {
+    private final String source;
+    private final String type;
+    private final String message;
+
+    @Builder
+    public ErrorValidation(String source, String type, String message) {
+        this.source = source;
+        this.type = type;
+        this.message = message;
+    }
+}

app/src/main/java/com/codesoom/assignment/common/dto/ErrorResponse.java

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+package com.codesoom.assignment.common.dto;
+
+import com.codesoom.assignment.common.ErrorValidation;
+import lombok.Getter;
+import lombok.Setter;
+import lombok.ToString;
+
+import java.util.List;
+
+@Getter
+@Setter
+@ToString
+public class ErrorResponse {
+    private String code;
+    private String message;
+    private List<ErrorValidation> errors;
+
+    public ErrorResponse(String code, String message, List<ErrorValidation> errors) {
+        this.code = code;
+        this.message = message;
+        this.errors = errors != null ? errors : List.of();
+    }
+
+}

app/src/main/java/com/codesoom/assignment/product/application/InvalidProductRequest.java

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+package com.codesoom.assignment.product.application;
+
+import com.codesoom.assignment.common.BaseException;
+
+public class InvalidProductRequest extends BaseException {
+    public static final String MESSAGE = "유효하지 않은 상품 정보입니다";
+
+    public InvalidProductRequest() {
+        super(MESSAGE);
+    }
+
+    @Override
+    public int getStatusCode() {
+        return 400;
+    }
+
+    public boolean hasErrors() {
+        return !errors.isEmpty();
+    }
+}

app/src/main/java/com/codesoom/assignment/product/application/ProductCreator.java

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+package com.codesoom.assignment.product.application;
+
+import com.codesoom.assignment.product.domain.Product;
+import com.codesoom.assignment.product.domain.dto.ProductRequest;
+import com.codesoom.assignment.product.infra.persistence.ProductRepository;
+import org.springframework.stereotype.Service;
+
+@Service
+public class ProductCreator {
+    private final ProductRepository productRepository;
+
+    public ProductCreator(ProductRepository productRepository) {
+        this.productRepository = productRepository;
+    }
+
+    public Product createProduct(ProductRequest product) {
+        return productRepository.save(product.toProductEntity());
+    }
+}

app/src/main/java/com/codesoom/assignment/product/application/ProductDeleter.java

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+package com.codesoom.assignment.product.application;
+
+import com.codesoom.assignment.product.domain.Product;
+import com.codesoom.assignment.product.infra.persistence.ProductRepository;
+import org.springframework.stereotype.Service;
+
+@Service
+public class ProductDeleter {
+
+    private final ProductRepository productRepository;
+    private final ProductReader productReader;
+
+    public ProductDeleter(ProductRepository productRepository, ProductReader productReader) {
+        this.productRepository = productRepository;
+        this.productReader = productReader;
+    }
+
+    public void deleteProduct(Long id) {
+        Product product = productReader.getProduct(id);
+        productRepository.delete(product);
+    }
+}

app/src/main/java/com/codesoom/assignment/product/application/ProductNotFoundException.java

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+package com.codesoom.assignment.product.application;
+
+import com.codesoom.assignment.common.BaseException;
+
+public class ProductNotFoundException extends BaseException {
+    public static final String MESSAGE = "해당하는 상품이 존재하지 않습니다";
+
+    public ProductNotFoundException() {
+        super(MESSAGE);
+    }
+
+    @Override
+    public int getStatusCode() {
+        return 404;
+    }
+}

app/src/main/java/com/codesoom/assignment/product/application/ProductReader.java

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+package com.codesoom.assignment.product.application;
+
+import com.codesoom.assignment.product.domain.Product;
+import com.codesoom.assignment.product.infra.persistence.ProductRepository;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.StreamSupport;
+
+@Service
+public class ProductReader {
+
+    private final ProductRepository productRepository;
+
+    public ProductReader(ProductRepository productRepository) {
+        this.productRepository = productRepository;
+    }
+
+    public List<Product> getProductList() {
+        return productRepository.findAll();
+    }
+
+    public Product getProduct(Long id) {
+        return productRepository.findById(id).orElseThrow(ProductNotFoundException::new);
+    }
+}

app/src/main/java/com/codesoom/assignment/product/application/ProductUpdater.java

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+package com.codesoom.assignment.product.application;
+
+import com.codesoom.assignment.product.domain.Product;
+import com.codesoom.assignment.product.domain.dto.ProductRequest;
+import com.codesoom.assignment.product.infra.persistence.ProductRepository;
+import org.springframework.stereotype.Service;
+
+import javax.transaction.Transactional;
+
+@Service
+public class ProductUpdater {
+    private final ProductRepository productRepository;
+
+    public ProductUpdater(ProductRepository productRepository) {
+        this.productRepository = productRepository;
+    }
+
+    @Transactional
+    public Product updateProduct(Long id, ProductRequest productRequest) {
+        Product product = productRepository.findById(id).orElseThrow(ProductNotFoundException::new);
+        product.update(productRequest.toProductEntity());
+        return product;
+    }
+}

app/src/main/java/com/codesoom/assignment/product/domain/Product.java

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+package com.codesoom.assignment.product.domain;
+
+import lombok.Builder;
+import lombok.Getter;
+import lombok.ToString;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+
+@Entity
+@Getter
+@ToString
+public class Product {
+    @Id
+    @GeneratedValue
+    private Long id;
+    private String name;
+    private String maker;
+    private Integer price;
+    private String imageUrl;
+
+    public Product() {
+    }
+
+    @Builder
+    public Product(Long id, String name, String maker, Integer price, String imageUrl) {
+        this.id = id;
+        this.name = name;
+        this.maker = maker;
+        this.price = price;
+        this.imageUrl = imageUrl;
+    }
+
+    public void update(Product source) {
+        this.name = source.name;
+        this.maker = source.maker;
+        this.price = source.price;
+        this.imageUrl = source.imageUrl;
+    }
+}

app/src/main/java/com/codesoom/assignment/product/domain/dto/ProductRequest.java

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+package com.codesoom.assignment.product.domain.dto;
+
+import com.codesoom.assignment.product.application.InvalidProductRequest;
+import com.codesoom.assignment.product.domain.Product;
+import lombok.Getter;
+import lombok.ToString;
+import org.springframework.util.StringUtils;
+
+@ToString
+@Getter
+public class ProductRequest {
+    private final String name;
+    private final String maker;
+    private final Integer price;
+    private final String imageUrl;
+
+    public ProductRequest(String name, String maker, Integer price, String imageUrl) {
+        this.name = name;
+        this.maker = maker;
+        this.price = price;
+        this.imageUrl = imageUrl;
+    }
+
+    public Product toProductEntity() {
+        return Product.builder()
+                .name(this.name)
+                .maker(this.maker)
+                .price(this.price)
+                .imageUrl(this.imageUrl).build();
+    }
+
+    public void validate() {
+        InvalidProductRequest invalidProductRequest = new InvalidProductRequest();
+
+        if (StringUtils.isEmpty(this.name)) {
+            invalidProductRequest.addValidation("name", "name is empty", "상품명은 필수입니다.");
+        }
+        if (StringUtils.isEmpty(this.maker)) {
+            invalidProductRequest.addValidation("maker", "maker is empty", "제조사은 필수입니다.");
+        }
+        if (this.price == null || this.price < 0) {
+            invalidProductRequest.addValidation("price", "price is empty", "가격은 필수입니다.");
+        }
+
+        if (invalidProductRequest.hasErrors()) {
+            throw invalidProductRequest;
+        }
+    }
+}

app/src/main/java/com/codesoom/assignment/product/domain/dto/ProductResponse.java

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+package com.codesoom.assignment.product.domain.dto;
+
+import com.codesoom.assignment.product.domain.Product;
+import lombok.Getter;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Getter
+public class ProductResponse {
+    private final Long id;
+    private final String name;
+    private final String maker;
+    private final Integer price;
+    private final String imageUrl;
+
+    public ProductResponse(Product product) {
+        this.id = product.getId();
+        this.name = product.getName();
+        this.maker = product.getMaker();
+        this.price = product.getPrice();
+        this.imageUrl = product.getImageUrl();
+    }
+
+    public static List<ProductResponse> listOf(Iterable<Product> list) {
+        ArrayList<ProductResponse> productResponseArrayList = new ArrayList<>();
+        for (Product product : list) {
+            productResponseArrayList.add(new ProductResponse(product));
+        }
+        return productResponseArrayList;
+    }
+
+}

app/src/main/java/com/codesoom/assignment/product/infra/api/web/v1/ProductAdvice.java

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+package com.codesoom.assignment.product.infra.api.web.v1;
+
+import com.codesoom.assignment.common.dto.ErrorResponse;
+import com.codesoom.assignment.product.application.InvalidProductRequest;
+import com.codesoom.assignment.product.application.ProductNotFoundException;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+@ControllerAdvice
+public class ProductAdvice {
+
+    @ExceptionHandler(ProductNotFoundException.class)
+    @ResponseStatus(HttpStatus.NOT_FOUND)
+    @ResponseBody
+    public ErrorResponse productNotFoundExceptionHandler(ProductNotFoundException e) {
+
+        return e.toErrorResponse();
+    }
+
+    @ExceptionHandler(InvalidProductRequest.class)
+    @ResponseStatus(HttpStatus.BAD_REQUEST)
+    @ResponseBody
+    public ErrorResponse invalidProductExceptionHandler(InvalidProductRequest e) {
+        return e.toErrorResponse();
+    }
+
+}

app/src/main/java/com/codesoom/assignment/product/infra/api/web/v1/ProductCreateController.java

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+package com.codesoom.assignment.product.infra.api.web.v1;
+
+import com.codesoom.assignment.product.application.ProductCreator;
+import com.codesoom.assignment.product.domain.dto.ProductRequest;
+import com.codesoom.assignment.product.domain.dto.ProductResponse;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@CrossOrigin
+@RequiredArgsConstructor
+public class ProductCreateController {
+    private final ProductCreator productCreator;
+
+    @PostMapping("/products")
+    @ResponseStatus(HttpStatus.CREATED)
+    public ProductResponse createProduct(@RequestBody ProductRequest productRequest) {
+        productRequest.validate();
+        return new ProductResponse(productCreator.createProduct(productRequest));
+    }
+}