Module java.compiler
Package javax.lang.model.element

Interface ModuleElement.DirectiveVisitor<R,​P>

  • 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 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.
        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