code: private static List<CampaignFeed> getCampaignFeeds(AdWordsServicesInterface adWordsServices,
        AdWordsSession session, Feed feed, int placeholderType) throws RemoteException {
      // Get the CampaignFeedService.
      CampaignFeedServiceInterface campaignFeedService =
          adWordsServices.get(session, CampaignFeedServiceInterface.class);
  
      String query = String.format(
          "SELECT CampaignId, MatchingFunction, PlaceholderTypes WHERE Status = 'ENABLED' "
          + "AND FeedId = %d AND PlaceholderTypes CONTAINS_ANY [%d]", feed.getId(), placeholderType);
  
      List<CampaignFeed> campaignFeeds = new ArrayList<>();
      int offset = 0;
      CampaignFeedPage campaignFeedPage;
  
      do {
        String pageQuery = String.format(query + " LIMIT %d, %d", offset, PAGE_SIZE);
        campaignFeedPage = campaignFeedService.query(pageQuery);
        if (campaignFeedPage.getEntries() != null) {
          campaignFeeds.addAll(Arrays.asList(campaignFeedPage.getEntries()));
        }
        offset += PAGE_SIZE;
      } while (offset < campaignFeedPage.getTotalNumEntries());
  
      return campaignFeeds;
    }
docs: Returns the campaign feeds that use a particular feed for a particular placeholder type.