channel [nfc]: Rename StreamStoreImpl to ChannelStoreImpl

Fixes parts of #631

Author: Khader-1

lib/model/channel.dart

@@ -7,7 +7,7 @@ import '../api/model/model.dart';
 /// This type is useful for expressing the needs of other parts of the
 /// implementation of [PerAccountStore], to avoid circularity.
 ///
-/// The data structures described here are implemented at [StreamStoreImpl].
+/// The data structures described here are implemented at [ChannelStoreImpl].
 mixin ChannelStore {
   Map<int, ZulipStream> get streams;
   Map<String, ZulipStream> get streamsByName;
@@ -72,8 +72,8 @@ mixin ChannelStore {
 /// Generally the only code that should need this class is [PerAccountStore]
 /// itself.  Other code accesses this functionality through [PerAccountStore],
 /// or through the mixin [ChannelStore] which describes its interface.
-class StreamStoreImpl with ChannelStore {
-  factory StreamStoreImpl({required InitialSnapshot initialSnapshot}) {
+class ChannelStoreImpl with ChannelStore {
+  factory ChannelStoreImpl({required InitialSnapshot initialSnapshot}) {
     final subscriptions = Map.fromEntries(initialSnapshot.subscriptions.map(
       (subscription) => MapEntry(subscription.streamId, subscription)));
 
@@ -92,15 +92,15 @@ class StreamStoreImpl with ChannelStore {
       forStream[item.topicName] = item.visibilityPolicy;
     }
 
-    return StreamStoreImpl._(
+    return ChannelStoreImpl._(
       streams: streams,
       streamsByName: streams.map((_, stream) => MapEntry(stream.name, stream)),
       subscriptions: subscriptions,
       topicVisibility: topicVisibility,
     );
   }
 
-  StreamStoreImpl._({
+  ChannelStoreImpl._({
     required this.streams,
     required this.streamsByName,
     required this.subscriptions,

lib/model/store.dart

@@ -226,7 +226,7 @@ class PerAccountStore extends ChangeNotifier with ChannelStore, MessageStore {
     connection ??= globalStore.apiConnectionFromAccount(account);
     assert(connection.zulipFeatureLevel == account.zulipFeatureLevel);
 
-    final streams = StreamStoreImpl(initialSnapshot: initialSnapshot);
+    final streams = ChannelStoreImpl(initialSnapshot: initialSnapshot);
     return PerAccountStore._(
       globalStore: globalStore,
       connection: connection,
@@ -272,7 +272,7 @@ class PerAccountStore extends ChangeNotifier with ChannelStore, MessageStore {
     required this.userSettings,
     required this.users,
     required this.typingStatus,
-    required StreamStoreImpl streams,
+    required ChannelStoreImpl streams,
     required MessageStoreImpl messages,
     required this.unreads,
     required this.recentDmConversationsView,
@@ -340,10 +340,10 @@ class PerAccountStore extends ChangeNotifier with ChannelStore, MessageStore {
   UserTopicVisibilityPolicy topicVisibilityPolicy(int streamId, String topic) =>
     _streams.topicVisibilityPolicy(streamId, topic);
 
-  final StreamStoreImpl _streams;
+  final ChannelStoreImpl _streams;
 
   @visibleForTesting
-  StreamStoreImpl get debugStreamStore => _streams;
+  ChannelStoreImpl get debugStreamStore => _streams;
 
   ////////////////////////////////
   // Messages, and summaries of messages.