refactor(recruit-board): RecruitBoard 상태 변경 검증 내부 로직 수정

Author: leebs0521

src/main/java/com/somemore/recruitboard/domain/RecruitBoard.java

@@ -1,6 +1,5 @@
 package com.somemore.recruitboard.domain;
 
-import static com.somemore.recruitboard.domain.RecruitStatus.CLOSED;
 import static com.somemore.recruitboard.domain.RecruitStatus.RECRUITING;
 import static jakarta.persistence.EnumType.STRING;
 import static jakarta.persistence.GenerationType.IDENTITY;
@@ -104,9 +103,10 @@ private void updateRecruitmentInfo(RecruitBoardUpdateRequestDto dto) {
     }
 
     private void validateStatusChange(RecruitStatus newStatus) {
-        if (newStatus != RECRUITING && newStatus != CLOSED) {
-            throw new IllegalArgumentException("상태는 '모집중' 또는 '마감'으로만 변경할 수 있습니다.");
+        if (newStatus.isChangeable()) {
+            return;
         }
+        throw new IllegalArgumentException("상태는 '모집중' 또는 '마감'으로만 변경할 수 있습니다.");
     }
 
     private void validateChangeDeadline(LocalDateTime currentDateTime) {

src/main/java/com/somemore/recruitboard/domain/RecruitStatus.java

@@ -6,11 +6,11 @@
 @Getter
 @RequiredArgsConstructor
 public enum RecruitStatus {
-    RECRUITING("모집중"),
-    CLOSED("마감"),
-    COMPLETED("종료"),
+    RECRUITING("모집중", true),
+    CLOSED("마감", true),
+    COMPLETED("종료", false),
 
     ;
     private final String text;
-
+    private final boolean changeable;
 }