Package Summary Overview Summary

### class:ModuleElement.DirectiveVisitor [NONE]
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 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 Details ### 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. Implementation Requirements: The default implementation is `d.accept(v, 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. Implementation Requirements: The default implementation is `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: The default 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