From 93fd99148f64bb2ff559cb5da28624393aa37069 Mon Sep 17 00:00:00 2001
From: Vishesh Handa <me@vhanda.in>
Date: Sat, 7 Nov 2020 15:48:01 +0100
Subject: [PATCH] Experiment with the concept of Transformers

---
 lib/core/transformers/base.dart                   | 15 +++++++++++++++
 .../emoji.dart}                                   | 12 ++++++++----
 2 files changed, 23 insertions(+), 4 deletions(-)
 create mode 100644 lib/core/transformers/base.dart
 rename lib/core/{processors/emoji_processor.dart => transformers/emoji.dart} (56%)

diff --git a/lib/core/transformers/base.dart b/lib/core/transformers/base.dart
new file mode 100644
index 00000000..ebd639e7
--- /dev/null
+++ b/lib/core/transformers/base.dart
@@ -0,0 +1,15 @@
+import 'package:gitjournal/core/note.dart';
+
+export 'package:gitjournal/core/note.dart';
+
+abstract class NoteReadTransformer {
+  Future<Note> onRead(Note note);
+}
+
+abstract class NoteWriteTransformer {
+  Future<Note> onWrite(Note note);
+}
+
+// ReadTransformersLoader(folderConfig) -> ...
+// WriteTransformerLoader(folderConfig) -> ...
+// -> test it out again
diff --git a/lib/core/processors/emoji_processor.dart b/lib/core/transformers/emoji.dart
similarity index 56%
rename from lib/core/processors/emoji_processor.dart
rename to lib/core/transformers/emoji.dart
index f1ffab8a..39998e78 100644
--- a/lib/core/processors/emoji_processor.dart
+++ b/lib/core/transformers/emoji.dart
@@ -1,17 +1,21 @@
 import 'package:flutter_emoji/flutter_emoji.dart';
 
-import 'package:gitjournal/core/note.dart';
+import 'base.dart';
 
-class EmojiProcessor {
+class EmojiProcessor implements NoteReadTransformer, NoteWriteTransformer {
   static final _emojiParser = EmojiParser();
 
-  void onSave(Note note) {
+  @override
+  Future<Note> onRead(Note note) async {
     note.title = _emojiParser.emojify(note.title);
     note.body = _emojiParser.emojify(note.body);
+    return note;
   }
 
-  void onLoad(Note note) {
+  @override
+  Future<Note> onWrite(Note note) async {
     note.body = _emojiParser.unemojify(note.body);
     note.title = _emojiParser.unemojify(note.title);
+    return note;
   }
 }