[YouTube] Use Optional chaining in YoutubePlaylistExtractor

Author: Isira-Seneviratne

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubePlaylistExtractor.java

@@ -267,51 +267,29 @@ public boolean isUploaderVerified() throws ParsingException {
     @Override
     public long getStreamCount() throws ParsingException {
         if (isNewPlaylistInterface) {
-            final String numVideosText =
-                    getTextFromObject(getPlaylistHeader().getObject("numVideosText"))
-                            .orElse(null);
-            if (numVideosText != null) {
-                try {
-                    return Long.parseLong(Utils.removeNonDigitCharacters(numVideosText));
-                } catch (final NumberFormatException ignored) {
-                }
-            }
-
-            final String firstByLineRendererText = getTextFromObject(
-                    getPlaylistHeader().getArray("byline")
+            final var count = getTextFromObject(getPlaylistHeader().getObject("numVideosText"))
+                    .or(() -> getTextFromObject(getPlaylistHeader().getArray("byline")
                             .getObject(0)
-                            .getObject("text"))
+                            .getObject("text")))
+                    .map(numText -> {
+                        try {
+                            return Long.parseLong(Utils.removeNonDigitCharacters(numText));
+                        } catch (final NumberFormatException e) {
+                            return null;
+                        }
+                    })
                     .orElse(null);
-
-            if (firstByLineRendererText != null) {
-                try {
-                    return Long.parseLong(Utils.removeNonDigitCharacters(firstByLineRendererText));
-                } catch (final NumberFormatException ignored) {
-                }
+            if (count != null) {
+                return count;
             }
         }
 
         // These data structures are returned in both layouts
-        final JsonArray briefStats =
-                (isNewPlaylistInterface ? getPlaylistHeader() : getPlaylistInfo())
-                        .getArray("briefStats");
-        if (!briefStats.isEmpty()) {
-            final var briefsStatsText = getTextFromObject(briefStats.getObject(0)).orElse(null);
-            if (briefsStatsText != null) {
-                return Long.parseLong(Utils.removeNonDigitCharacters(briefsStatsText));
-            }
-        }
-
-        final JsonArray stats = (isNewPlaylistInterface ? getPlaylistHeader() : getPlaylistInfo())
-                .getArray("stats");
-        if (!stats.isEmpty()) {
-            final var statsText = getTextFromObject(stats.getObject(0)).orElse(null);
-            if (statsText != null) {
-                return Long.parseLong(Utils.removeNonDigitCharacters(statsText));
-            }
-        }
-
-        return ITEM_COUNT_UNKNOWN;
+        final var playlist = isNewPlaylistInterface ? getPlaylistHeader() : getPlaylistInfo();
+        return getTextFromObject(playlist.getArray("briefStats").getObject(0))
+                .or(() -> getTextFromObject(playlist.getArray("stats").getObject(0)))
+                .map(text -> Long.parseLong(Utils.removeNonDigitCharacters(text)))
+                .orElse(ITEM_COUNT_UNKNOWN);
     }
 
     @Nonnull