###main
/*
* This source file was generated by the Gradle 'init' task
*/
package com.example.minitl;
import java.time.*;
import java.time.format.DateTimeFormatter;
import java.util.*;
public class Main {
public static void main(String[] args) {
//json読み込み
if (args.length!=0){
//コマンドライン実行
}
Scanner sc = new Scanner(System.in);
PostStore store = new PostStore();
System.err.println(store);
DateTimeFormatter timeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
while (true) {
System.out.println("======= minitl cli =======");
System.out.println("1) post");
System.out.println("2) list");
System.out.println("3) like");
System.out.println("4) delete");
System.out.println("5) serch");
System.out.println("6) quit");
System.out.println("---choose number:");
int choice = Integer.parseInt(sc.nextLine().trim());
try {
switch (choice) {
case 1 -> {
//投稿の追加
System.out.print("---write author: ");
String author = sc.nextLine();
System.out.print("---write body: ");
String body = sc.nextLine();
Post post = store.add(author, body);
System.out.println("created: " + post);
}
case 2 -> {
//投稿一覧の表示
for (Post post : store.list()) {
System.out.println("[id=" + post.id() + "] " + post.author() + " likes=" + post.likeCount() + " " + post.createdAt().format(timeFormatter) + "\n" + post.body() + "\n");
}
}
case 3 -> {
//投稿へのlike
System.out.println("---choose id: ");
long id = Long.parseLong(sc.nextLine());
store.like(id);
System.out.println("liked!");
}
case 4 -> {
//投稿の削除
System.out.println("---choose id: ");
long id = Long.parseLong(sc.nextLine());
store.delete(id);
System.out.println("deleted!");
}
case 5 -> {
//投稿のキーワード検索
System.out.println("---input keyword");
String keyword = sc.nextLine();
List<Post> result = store.search(keyword);
System.out.println(result);
}
case 6 -> {
//終了
System.out.println("quited");
return;
}
default -> System.out.println("invalid");
}
} catch (PostNotFoundException e) {
System.out.println("[Post not found] " + e.getMessage());
} catch (IllegalArgumentException e) {
System.out.println("[Invalid input] " + e.getMessage());
}
}
//json保存
}
}
###post
package com.example.minitl;
import java.time.LocalDateTime;
public record Post(long id, String author, String body, int likeCount, LocalDateTime createdAt) {}
###poststore
package com.example.minitl;
import java.util.*;
import java.util.stream.Collectors;
import java.time.*;
public class PostStore {
private final List<Post> posts = new ArrayList<>();
private long nextId = 1;
//add(auther, body)->新しいpostをつくって先頭に追加し、返す
public Post add(String author, String body) {
if (author.isBlank() || author.length() > 20) {
throw new IllegalArgumentException("author must be 1-20 characters");
}
if (body.isBlank() || body.length() > 140) {
throw new IllegalArgumentException("body must be 1-140 characters");
}
LocalDateTime createdAt = LocalDateTime.now(ZoneId.of("Asia/Tokyo"));
Post post = new Post(nextId++, author, body, 0, createdAt);
posts.add(0, post); // 先頭に追加
return post;
}
//list()ー＞全件を新しい順でかえす
public List<Post> list() {
return new ArrayList<>(posts);
}
//like(id)->likeCountを+1した新しいpostに差し替える。なければ例外
public void like(long id) {
for (int i = 0; i < posts.size(); i++) {
Post post = posts.get(i);
if (post.id() == id) {
Post updated = new Post(post.id(), post.author(), post.body(), post.likeCount() + 1, post.createdAt());
posts.set(i, updated);
return;
}
}
throw new PostNotFoundException(id);
}
// delete(id)->削除する。存在しなければ例外
public void delete(long id) {
boolean isRemoved = posts.removeIf(post -> post.id() == id);
if (!isRemoved) {
throw new PostNotFoundException(id);
}
}
//serch <keyword>キーワード検索
public List<Post> search(String keyword){
List<Post> result = posts.stream()
.filter(p -> p.body().contains(keyword))
.collect(Collectors.toList());
return result;
}
}
###PostE
package com.example.minitl;
public class PostNotFoundException extends RuntimeException {
public PostNotFoundException(long id) {
super("id:" + id + " is not found");
}
}