public interface ProviderWithExtensionVisitor<T>
extends Provider<T>

A Provider that is part of an extension which supports a custom BindingTargetVisitor.

When an extension binds a provider instance, the provider can implement this interface to allow users using the Binding.acceptTargetVisitor(BindingTargetVisitor) method to visit a custom visitor designed for that extension. A typical implementation within the extension would look like

 
 <V, B> V acceptExtensionVisitor(BindingTargetVisitor<B, V> visitor, ProviderInstanceBinding<? extends B> binding) {
   if(visitor instanceof MyCustomExtensionVisitor) {
     return ((MyCustomExtensionVisitor<B, V>)visitor).visitCustomExtension(customProperties, binding);
   } else {
     return visitor.visit(binding);
   }
 }

'MyCustomExtensionVisitor' in the example above would be an interface the extension provides that users can implement in order to be notified of custom extension information. These visitor interfaces must extend from BindingTargetVisitor.