title: Delete all files in 'folder' or with prefix in Google Cloud Bucket from Java
body: <p>I know the idea of 'folders' is sort of non existent or different in Google Cloud Storage, but I need a way to delete all objects in a 'folder' or with a given prefix from Java.</p>
  
  <p>The GcsService has a delete function, but as far as I can tell it only takes 1 GscFilename object and does not honor wildcards (i.e., "folderName/**" did not work).</p>
  
  <p>Any tips?</p>