Added Validator folder in the MVCPractice section of a small course on Java EE

Author: JcoderPaul

MVCPractice/src/AirportSimulator/Validator/CreateUserValidator.java

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+package AirportSimulator.Validator;
+
+import AirportSimulator.DTO.CreateUserDto;
+import AirportSimulator.Entity.EntityEnum.Gender;
+import AirportSimulator.Util.LocalDateFormatter;
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+public class CreateUserValidator implements Validator<CreateUserDto>{
+
+    private static final CreateUserValidator INSTANCE = new CreateUserValidator();
+
+    public static CreateUserValidator getInstance() {
+        return INSTANCE;
+    }
+    /* Проверяем на валидность - правильность введенную дату и пол */
+    @Override
+    public ValidationResult isValid(CreateUserDto object) {
+        ValidationResult validationResult = new ValidationResult();
+        if (!LocalDateFormatter.isValid(object.getBirthday())){
+            validationResult.addErrors(Error.of("invalid.birthday","Birthday is invalid"));
+        }
+        if (object.getGender() == null || Gender.valueOf(object.getGender()) == null) {
+            validationResult.addErrors(Error.of("invalid.gender","Gender is invalid"));
+        }
+
+        return validationResult;
+    }
+}

MVCPractice/src/AirportSimulator/Validator/Error.java

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+package AirportSimulator.Validator;
+/* Класс описывающий ошибки при валидации */
+import lombok.Value;
+
+@Value(staticConstructor = "of")
+public class Error {
+    private String code;
+    private String message;
+}

MVCPractice/src/AirportSimulator/Validator/ValidationResult.java

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+package AirportSimulator.Validator;
+
+import lombok.Getter;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ValidationResult {
+    @Getter
+    private List<Error> errors = new ArrayList<>();
+
+    public void addErrors(Error find_error) {
+        this.errors.add(find_error);
+    }
+
+    public boolean isValid(){
+        return errors.isEmpty();
+    }
+}

MVCPractice/src/AirportSimulator/Validator/Validator.java

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+package AirportSimulator.Validator;
+
+public interface Validator <T>{
+    ValidationResult isValid(T object);
+}