e keys from which equivalent data can be loaded. The
 <a href="../../../../../com/bumptech/glide/load/data/DataFetcher.html" title="interface in com.bumptech.glide.load.data"><code>DataFetcher</code></a> will not be used if the resource is already cached.

 <p> Note - If no valid data fetcher can be returned (for example if a model has a null URL),
 then it is acceptable to return a null data fetcher from this method. </p></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code