refactor: ProductValidator 인터페이스 도입으로 DIP 적용

src/main/java/flab/nutridiary/product/repository/ProductRepository.java

@@ -5,5 +5,5 @@
 public interface ProductRepository {
     Product save(Product product);
 
-    Boolean productDuplicatedCheckByNormalizedName(String normalizedName);
+    Boolean productDuplicatedCheck(String normalizedName);
 }

src/main/java/flab/nutridiary/product/repository/ProductRepositoryImpl.java

@@ -16,7 +16,7 @@ public Product save(Product product) {
     }
 
     @Override
-    public Boolean productDuplicatedCheckByNormalizedName(String normalizedName) {
+    public Boolean productDuplicatedCheck(String normalizedName) {
         return productCrudRepository.countByNormalizedName(normalizedName) > 0;
     }
 }

src/main/java/flab/nutridiary/product/service/ProductValidator.java

@@ -1,29 +1,7 @@
 package flab.nutridiary.product.service;
 
 import flab.nutridiary.product.domain.Product;
-import flab.nutridiary.product.repository.ProductRepository;
-import lombok.RequiredArgsConstructor;
-import org.springframework.stereotype.Component;
 
-@RequiredArgsConstructor
-@Component
-public class ProductValidator {
-
-    private static final String WHITESPACE_REGEX = "\\s+";
-    private static final String EMPTY = "";
-    private final ProductRepository productRepository;
-
-    public void validate(Product product) {
-        validate(getNormalizedName(product.getProductName(), product.getProductCorp()));
-    }
-
-    private void validate(String normalizedName) {
-        if (productRepository.productDuplicatedCheckByNormalizedName(normalizedName)) {
-            throw new ProductDuplicatedException();
-        }
-    }
-
-    private String getNormalizedName(String productName, String productCorp) {
-        return productCorp.replaceAll(WHITESPACE_REGEX, EMPTY) + productName.replaceAll(WHITESPACE_REGEX, EMPTY);
-    }
+public interface ProductValidator {
+    void validate(Product product);
 }

src/main/java/flab/nutridiary/product/service/WhiteSpaceProductValidator.java

@@ -0,0 +1,30 @@
+package flab.nutridiary.product.service;
+
+import flab.nutridiary.product.domain.Product;
+import flab.nutridiary.product.repository.ProductRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Component;
+
+@Component
+@RequiredArgsConstructor
+public class WhiteSpaceProductValidator implements ProductValidator {
+
+    private static final String WHITESPACE_REGEX = "\\s+";
+    private static final String EMPTY = "";
+    private final ProductRepository productRepository;
+
+    @Override
+    public void validate(Product product) {
+        validate(getNormalizedName(product.getProductName(), product.getProductCorp()));
+    }
+
+    private void validate(String normalizedName) {
+        if (productRepository.productDuplicatedCheck(normalizedName)) {
+            throw new ProductDuplicatedException();
+        }
+    }
+
+    private String getNormalizedName(String productName, String productCorp) {
+        return productCorp.replaceAll(WHITESPACE_REGEX, EMPTY) + productName.replaceAll(WHITESPACE_REGEX, EMPTY);
+    }
+}