docs: @Override
      public final synchronized void setSyndFeed(final SyndFeed feed) {
          super.setSyndFeed(feed);
  
          changedMap.clear();
          final List<SyndEntry> entries = feed.getEntries();
          for (final SyndEntry entry : entries) {
              final String currentEntryTag = computeEntryTag(entry);
              final String previousEntryTag = entryTagsMap.get(entry.getUri());
  
              if (previousEntryTag == null || !currentEntryTag.equals(previousEntryTag)) {
                  // Entry has changed
                  changedMap.put(entry.getUri(), Boolean.TRUE);
              }
              entryTagsMap.put(entry.getUri(), currentEntryTag);
          }
      }