 class.

 For component classes that are not configured in this configuration context the method returns
 an empty <code>Map</code>. Method does not return <code>null</code>.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>map of extension contracts and their priorities for which the component class
         is registered.
         May return an empty map in case the component has not been registered for any
         extension contract supported by the implementation.</dd>
</dl>
</li>
</ul