Add ValidatorService and ValidatorServiceImpl

00-backend/src/main/java/de/htwsaar/webshop/service/ValidatorService.java

@@ -0,0 +1,5 @@
+package de.htwsaar.webshop.service;
+
+public interface ValidatorService {
+    <T> boolean isInvalid(T object);
+}

00-backend/src/main/java/de/htwsaar/webshop/service/impl/ValidatorServiceImpl.java

@@ -0,0 +1,34 @@
+package de.htwsaar.webshop.service.impl;
+
+import de.htwsaar.webshop.service.ValidatorService;
+import jakarta.validation.ConstraintViolation;
+import jakarta.validation.Validation;
+import jakarta.validation.Validator;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+
+import java.util.Set;
+
+@Service
+@Slf4j
+public class ValidatorServiceImpl implements ValidatorService {
+    private final Validator validator;
+
+    public ValidatorServiceImpl() {
+        validator = Validation.buildDefaultValidatorFactory().getValidator();
+    }
+
+    /**
+     * Jakarta Validator
+     *
+     * @param validatable any Validatable
+     * @return whether the Object is Invalid
+     * @param <T> any Validatable
+     */
+    @Override
+    public <T> boolean isInvalid(T validatable) {
+        Set<ConstraintViolation<T>> violations = validator.validate(validatable);
+        violations.forEach((violation) -> log.warn("[Validator] Invalid {}:  {}", validatable, violation.getMessage()));
+        return !violations.isEmpty();
+    }
+}