Implement opened rooms caching

app/src/main/java/chat/rocket/android/RocketChatCache.java

@@ -34,6 +34,7 @@ public class RocketChatCache {
     private static final String KEY_SELECTED_ROOM_ID = "KEY_SELECTED_ROOM_ID";
     private static final String KEY_PUSH_ID = "KEY_PUSH_ID";
     private static final String KEY_HOSTNAME_LIST = "KEY_HOSTNAME_LIST";
+    private static final String KEY_OPENED_ROOMS = "KEY_OPENED_ROOMS";
 
     private Context context;
 
@@ -41,6 +42,38 @@ public class RocketChatCache {
         this.context = context.getApplicationContext();
     }
 
+    public void addOpenedRoom(@NonNull String roomId, long lastSeen) {
+        JSONObject openedRooms = getOpenedRooms();
+        try {
+            JSONObject room = new JSONObject().put("rid", roomId).put("ls", lastSeen);
+            openedRooms.put(roomId, room);
+        } catch (JSONException e) {
+            RCLog.e(e);
+        }
+        setString(KEY_OPENED_ROOMS, openedRooms.toString());
+    }
+
+    public void removeOpenedRoom(@NonNull String roomId) {
+        JSONObject openedRooms = getOpenedRooms();
+        if (openedRooms.has(roomId)) {
+            openedRooms.remove(roomId);
+        }
+    }
+
+    public @NonNull
+    JSONObject getOpenedRooms() {
+        String openedRooms = getString(KEY_OPENED_ROOMS, "");
+        if (openedRooms.isEmpty()) {
+            return new JSONObject();
+        }
+        try {
+            return new JSONObject(openedRooms);
+        } catch (JSONException e) {
+            RCLog.e(e);
+        }
+        return new JSONObject();
+    }
+
     public String getSelectedServerHostname() {
         return getString(KEY_SELECTED_SERVER_HOSTNAME, null);
     }
@@ -65,7 +98,8 @@ public class RocketChatCache {
         }
     }
 
-  public @NonNull String getHostSiteName(@NonNull String host) {
+    public @NonNull
+    String getHostSiteName(@NonNull String host) {
         if (host.startsWith("http")) {
             HttpUrl url = HttpUrl.parse(host);
             if (url != null) {
@@ -84,7 +118,8 @@ public class RocketChatCache {
         return "";
     }
 
-  private @Nullable String getHostSiteNamesJson() {
+    private @Nullable
+    String getHostSiteNamesJson() {
         return getString(KEY_SELECTED_SITE_NAME, null);
     }
 
@@ -104,7 +139,8 @@ public class RocketChatCache {
         }
     }
 
-  public @Nullable String getSiteUrlFor(String hostname) {
+    public @Nullable
+    String getSiteUrlFor(String hostname) {
         try {
             String selectedServerHostname = getSelectedServerHostname();
             if (getLoginHostnamesJson() == null || getLoginHostnamesJson().isEmpty()) {
@@ -118,7 +154,8 @@ public class RocketChatCache {
         return null;
     }
 
-  private @Nullable String getLoginHostnamesJson() {
+    private @Nullable
+    String getLoginHostnamesJson() {
         return getString(KEY_SELECTED_SITE_URL, null);
     }
 
@@ -150,7 +187,7 @@ public class RocketChatCache {
         try {
             JSONObject jsonObj = new JSONObject(json);
             List<Pair<String, Pair<String, String>>> serverList = new ArrayList<>();
-      for (Iterator<String> iter = jsonObj.keys(); iter.hasNext();) {
+            for (Iterator<String> iter = jsonObj.keys(); iter.hasNext(); ) {
                 String hostname = iter.next();
                 JSONObject serverInfoJson = jsonObj.getJSONObject(hostname);
                 serverList.add(new Pair<>(hostname, new Pair<>(