[java sdk v2] check if entry of a listResult is a file

Hi, 

With Java Sdk V1 I was able to do build a list of my own type of objects based only on the files I was finding in a dropbox path:

List<DbxEntry> dbxEntries = dbxClient.searchFileAndFolderNames(path, query);
            for (DbxEntry child : dbxEntries)
            {
                if (child.isFile())
                {
                    StorageFileImpl i = new StorageFileImpl();
                    i.setName(child.name);
                    i.setPath(child.path);
                    i.setCreationDate(child.asFile().lastModified);
                    result.add(i);
                }
            }

I'm trying to do the same thing with Sdk V2.

I've considered 2 options:

1. using files().searchBuilder - but the query param is not helping me at all. I'd like to be able to ignore it or pass empty string as a value for it, but as far as I've tried, that doesn't work..

dbxClient.files().searchBuilder(path, query).withMode(SearchMode.FILENAME).start();

2. using files().listFolderBuilder - but I get entries for folders as well, and I can't exclude them although I saw while debugging that each entry has a file / folder .tag 

dbxClient.files().listFolderBuilder(path).withRecursive(true).start();

 My code would be the following: 

listResult.getEntries().stream()
                    .forEach(entry -> {
                        // check it is a file
                        // ???
                        StorageFileImpl i = new StorageFileImpl();
                        i.setName(entry.getName());
                        i.setPath(entry.getPathDisplay());
//                        i.setCreationDate(entry.notYetAvailable());
                        result.add(i);
                    });

How can I keep only the file .tag type entries ?

Or what other options do I have ? 

thanks, 

-victor