feat: Follow 예외 정의

Author: sapiens2000

src/main/java/com/example/log4u/domain/follow/exception/FollowErrorCode.java

@@ -0,0 +1,29 @@
+package com.example.log4u.domain.follow.exception;
+
+import org.springframework.http.HttpStatus;
+
+import com.example.log4u.common.exception.base.ErrorCode;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@Getter
+@RequiredArgsConstructor
+public enum FollowErrorCode implements ErrorCode {
+	FOLLOW_NOT_FOUND(HttpStatus.NOT_FOUND, "팔로우 정보가 존재하지 않습니다."),
+	FOLLOWER_NOT_FOUND(HttpStatus.NOT_FOUND, "팔로워 정보가 존재하지 않습니다.");
+
+	private final HttpStatus httpStatus;
+	private final String message;
+
+	@Override
+	public HttpStatus getHttpStatus() {
+		return httpStatus;
+	}
+
+	@Override
+	public String getErrorMessage() {
+		return message;
+	}
+}
+

src/main/java/com/example/log4u/domain/follow/exception/FollowNotFoundException.java

@@ -0,0 +1,9 @@
+package com.example.log4u.domain.follow.exception;
+
+import com.example.log4u.common.exception.base.ServiceException;
+
+public class FollowNotFoundException extends ServiceException {
+	public FollowNotFoundException() {
+		super(FollowErrorCode.FOLLOW_NOT_FOUND);
+	}
+}