2주차 심화과제

SecondSeminar/src/main/java/sopt/org/SecondSeminar/controller/post/PostController.java

@@ -3,6 +3,7 @@
 import lombok.RequiredArgsConstructor;
 import org.springframework.web.bind.annotation.*;
 import sopt.org.SecondSeminar.controller.post.dto.CreatePostDTO;
+import sopt.org.SecondSeminar.controller.post.dto.UpdatePostDTO;
 import sopt.org.SecondSeminar.domain.post.Post;
 import sopt.org.SecondSeminar.service.post.PostService;
 
@@ -35,4 +36,16 @@ public String getPostByTitle(@RequestParam final String title) {
             return "조회된 게시물이 없습니다.";
         return postList;
     }
+
+    @PutMapping("/post/{postId}")
+    public String updatePost(@PathVariable final int postId, @RequestBody final UpdatePostDTO post) {
+        Optional<String> updateResult = postService.updatePost(postId, post);
+        return updateResult.orElse("게시물 업데이트를 실패했습니다.");
+    }
+
+    @DeleteMapping("/post/{postId}")
+    public String deletePost(@PathVariable final int postId) {
+        Optional<Integer> deletePostId = postService.deletePost(postId);
+        return deletePostId.map(id -> id + "번 게시물이 삭제되었습니다.").orElse("게시물 삭제를 실패했습니다.");
+    }
 }

SecondSeminar/src/main/java/sopt/org/SecondSeminar/controller/post/dto/UpdatePostDTO.java

@@ -0,0 +1,13 @@
+package sopt.org.SecondSeminar.controller.post.dto;
+
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor(access = AccessLevel.PRIVATE)
+public class UpdatePostDTO {
+    private String writer;
+    private String title;
+    private String content;
+}

SecondSeminar/src/main/java/sopt/org/SecondSeminar/service/post/PostService.java

@@ -2,6 +2,7 @@
 
 import org.springframework.stereotype.Service;
 import sopt.org.SecondSeminar.controller.post.dto.CreatePostDTO;
+import sopt.org.SecondSeminar.controller.post.dto.UpdatePostDTO;
 import sopt.org.SecondSeminar.domain.post.Post;
 
 import java.util.Optional;
@@ -11,29 +12,29 @@
 @Service
 public class PostService {
 
-    public Long createPost(CreatePostDTO post) {
+    public Long createPost(final CreatePostDTO post) {
         Post newPost = new Post(
                 post.getWriter(),
                 post.getTitle(),
                 post.getContent(),
                 post.getLike()
         );
 
-        postList.add(newPost);
         newPost.setId((long) postList.size());
+        postList.add(newPost);
 
         return newPost.getId();
     }
 
-    public Optional<Post> getPostById(Integer postId) { //코틀린 nullable ? 대신 자바는 Optional
-        if (postList.size() >= postId) {
+    public Optional<Post> getPostById(final Integer postId) { //코틀린 nullable ? 대신 자바는 Optional
+        if (postList.size() > postId) {
             return Optional.of(postList.get(postId)); //코틀린 !! -> 무조건 null이 아님
         } else {
             return Optional.empty(); //null 객체
         }
     }
 
-    public String getPostByTitle(String title) {
+    public String getPostByTitle(final String title) {
         StringBuilder resultPostList = new StringBuilder();
         postList.forEach((post) -> {
                     if (title.equals(post.getTitle())) {
@@ -45,4 +46,27 @@ public String getPostByTitle(String title) {
 
         return resultPostList.toString();
     }
+
+    public Optional<String> updatePost(final int postId, final UpdatePostDTO post) {
+        if (postId < postList.size()) {
+            Post updatePost = new Post(
+                    post.getWriter(),
+                    post.getTitle(),
+                    post.getContent(),
+                    postList.get(postId).getLike()
+            );
+            updatePost.setId((long) postId);
+            postList.set(postId, updatePost);
+            return Optional.of(postList.get(postId).toString());
+        }
+        return Optional.empty();
+    }
+
+    public Optional<Integer> deletePost(final int postId) {
+        if (postId < postList.size()) {
+            postList.remove(postId);
+            return Optional.of(postId);
+        }
+        return Optional.empty();
+    }
 }