Type 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.

Enclosing interface:

ModuleElement
```
public static interface ModuleElement.DirectiveVisitor<R,P>
```
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 .

Since:

9

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`default R`	`visit(ModuleElement.Directive d)`	Visits any directive as if by passing itself to that directive's `accept` method and passing `null` for the additional parameter.
`default R`	`visit(ModuleElement.Directive d, P p)`	Visits any directive as if by passing itself to that directive's `accept` method.
`R`	`visitExports(ModuleElement.ExportsDirective d, P p)`	Visits an `exports` directive.
`R`	`visitOpens(ModuleElement.OpensDirective d, P p)`	Visits an `opens` directive.
`R`	`visitProvides(ModuleElement.ProvidesDirective d, P p)`	Visits a `provides` directive.
`R`	`visitRequires(ModuleElement.RequiresDirective d, P p)`	Visits a `requires` directive.
`default R`	`visitUnknown(ModuleElement.Directive d, P p)`	Visits an unknown directive.
`R`	`visitUses(ModuleElement.UsesDirective d, P p)`	Visits a `uses` directive.

- Method Detail
  - visit
```
default R visit(ModuleElement.Directive d)
```
    Visits any directive as if by passing itself to that directive's accept method and passing null for the additional parameter. The invocation v.visit(d) is equivalent to d.accept(v, null) .
    
    Implementation Requirements:
    
    This implementation is visit(d, null)
    
    Parameters:
    
    d - the directive to visit
    
    Returns:
    
    a visitor-specified result
  - visit
```
default R visit(ModuleElement.Directive d,
                P p)
```
    Visits any directive as if by passing itself to that directive's accept method. The invocation v.visit(d, p) is equivalent to d.accept(v, p) .
    
    Parameters:
    
    d - the directive to visit
    
    p - a visitor-specified parameter
    
    Returns:
    
    a visitor-specified result
  - visitRequires
```
R visitRequires(ModuleElement.RequiresDirective d,
                P p)
```
    Visits a requires directive.
    
    Parameters:
    
    d - the directive to visit
    
    p - a visitor-specified parameter
    
    Returns:
    
    a visitor-specified result
  - visitExports
```
R visitExports(ModuleElement.ExportsDirective d,
               P p)
```
    Visits an exports directive.
    
    Parameters:
    
    d - the directive to visit
    
    p - a visitor-specified parameter
    
    Returns:
    
    a visitor-specified result
  - visitOpens
```
R visitOpens(ModuleElement.OpensDirective d,
             P p)
```
    Visits an opens directive.
    
    Parameters:
    
    d - the directive to visit
    
    p - a visitor-specified parameter
    
    Returns:
    
    a visitor-specified result
  - visitUses
```
R visitUses(ModuleElement.UsesDirective d,
            P p)
```
    Visits a uses directive.
    
    Parameters:
    
    d - the directive to visit
    
    p - a visitor-specified parameter
    
    Returns:
    
    a visitor-specified result
  - visitProvides
```
R visitProvides(ModuleElement.ProvidesDirective d,
                P p)
```
    Visits a provides directive.
    
    Parameters:
    
    d - the directive to visit
    
    p - a visitor-specified parameter
    
    Returns:
    
    a visitor-specified result
  - visitUnknown
```
default R visitUnknown(ModuleElement.Directive d,
                       P p)
```
    Visits an unknown directive. This can occur if the language evolves and new kinds of directive are added.
    
    Implementation Requirements:
    
    This implementation throws new UnknownDirectiveException(d, p) .
    
    Parameters:
    
    d - the directive to visit
    
    p - a visitor-specified parameter
    
    Returns:
    
    a visitor-specified result
    
    Throws:
    
    UnknownDirectiveException - a visitor implementation may optionally throw this exception

Interface ModuleElement.DirectiveVisitor<R,P>

Method Summary

Method Detail

visit

visit

visitRequires

visitExports

visitOpens

visitUses

visitProvides

visitUnknown