refactor(Announcement.java): add the Announcement model back, no full announcements fragment yet

mastodon/src/main/java/org/joinmastodon/android/model/Announcement.java

@@ -0,0 +1,65 @@
+package org.joinmastodon.android.model;
+
+import org.joinmastodon.android.api.ObjectValidationException;
+import org.joinmastodon.android.api.RequiredField;
+import org.parceler.Parcel;
+
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.List;
+
+@Parcel
+public class Announcement extends BaseModel implements DisplayItemsParent {
+	@RequiredField
+	public String id;
+	@RequiredField
+	public String content;
+	public Instant startsAt;
+	public Instant endsAt;
+	public boolean published;
+	public boolean allDay;
+	public Instant publishedAt;
+	public Instant updatedAt;
+	public boolean read;
+	public List<Emoji> emojis;
+	public List<EmojiReaction> reactions;
+	public List<Mention> mentions;
+	public List<Hashtag> tags;
+
+	@Override
+	public String toString() {
+		return "Announcement{" +
+				"id='" + id + '\'' +
+				", content='" + content + '\'' +
+				", startsAt=" + startsAt +
+				", endsAt=" + endsAt +
+				", published=" + published +
+				", allDay=" + allDay +
+				", publishedAt=" + publishedAt +
+				", updatedAt=" + updatedAt +
+				", read=" + read +
+				", emojis=" + emojis +
+				", mentions=" + mentions +
+				", tags=" + tags +
+				'}';
+	}
+
+	@Override
+	public void postprocess() throws ObjectValidationException{
+		super.postprocess();
+		if(reactions==null) reactions=new ArrayList<>();
+	}
+
+	public Status toStatus() {
+		Status s=Status.ofFake(id, content, publishedAt);
+		s.createdAt=startsAt != null ? startsAt : publishedAt;
+		s.reactions=reactions;
+		if(updatedAt != null) s.editedAt=updatedAt;
+		return s;
+	}
+
+	@Override
+	public String getID() {
+		return id;
+	}
+}