A visitor of module directives, in the style of the visitor design pattern. Classes implementing this interface are used to operate on a directive when the kind of directive is unknown at compile time. When a visitor is passed to a directive's accept method, the visitXyz method applicable to that directive is invoked.

Classes implementing this interface may or may not throw a NullPointerException if the additional parameter p is null; see documentation of the implementing class for details.

WARNING: It is possible that methods will be added to this interface to accommodate new, currently unknown, language structures added to future versions of the Java™ programming language. Methods to accommodate new language constructs will be added in a source compatible way using default methods.

Parameters:

<R>		the return type of this visitor's methods. Use Void for visitors that do not need to return results.
<P>		the type of the additional parameter to this visitor's methods. Use Void for visitors that do not need an additional parameter.

Since:  9

@spec JPMS