Interface ElementVisitor<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.
All Known Implementing Classes:
AbstractElementVisitor14, AbstractElementVisitor6, AbstractElementVisitor7, AbstractElementVisitor8, AbstractElementVisitor9, AbstractElementVisitorPreviewPREVIEW, ElementKindVisitor14, ElementKindVisitor6, ElementKindVisitor7, ElementKindVisitor8, ElementKindVisitor9, ElementKindVisitorPreviewPREVIEW, ElementScanner14, ElementScanner6, ElementScanner7, ElementScanner8, ElementScanner9, ElementScannerPreviewPREVIEW, SimpleElementVisitor14, SimpleElementVisitor6, SimpleElementVisitor7, SimpleElementVisitor8, SimpleElementVisitor9, SimpleElementVisitorPreviewPREVIEW
public interface ElementVisitor<R,P>
A visitor of program elements, in the style of the visitor design pattern. Classes implementing this interface are used to operate on an element when the kind of element is unknown at compile time. When a visitor is passed to an element's accept method, the visitXyz method most applicable to that element 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.

Since:
1.6

  • Method Details

    • visit

      R visit(Element e, P p)
      Visits an element.
      Parameters:
      e - the element to visit
      p - a visitor-specified parameter
      Returns:
      a visitor-specified result

    • visit

      default R visit(Element e)
      A convenience method equivalent to visit(e, null).
      Parameters:
      e - the element to visit
      Returns:
      a visitor-specified result

    • visitPackage

      R visitPackage(PackageElement e, P p)
      Visits a package element.
      Parameters:
      e - the element to visit
      p - a visitor-specified parameter
      Returns:
      a visitor-specified result

    • visitType

      R visitType(TypeElement e, P p)
      Visits a type element.
      Parameters:
      e - the element to visit
      p - a visitor-specified parameter
      Returns:
      a visitor-specified result

    • visitVariable

      R visitVariable(VariableElement e, P p)
      Visits a variable element.
      Parameters:
      e - the element to visit
      p - a visitor-specified parameter
      Returns:
      a visitor-specified result

    • visitExecutable

      R visitExecutable(ExecutableElement e, P p)
      Visits an executable element.
      Parameters:
      e - the element to visit
      p - a visitor-specified parameter
      Returns:
      a visitor-specified result

    • visitTypeParameter

      R visitTypeParameter(TypeParameterElement e, P p)
      Visits a type parameter element.
      Parameters:
      e - the element to visit
      p - a visitor-specified parameter
      Returns:
      a visitor-specified result

    • visitUnknown

      R visitUnknown(Element e, P p)
      Visits an unknown kind of element. This can occur if the language evolves and new kinds of elements are added to the Element hierarchy.
      Parameters:
      e - the element to visit
      p - a visitor-specified parameter
      Returns:
      a visitor-specified result
      Throws:
      UnknownElementException - a visitor implementation may optionally throw this exception

    • visitModule

      default R visitModule(ModuleElement e, P p)
      Visits a module element.
      Parameters:
      e - the element to visit
      p - a visitor-specified parameter
      Returns:
      a visitor-specified result
      Since:
      9

    • visitRecordComponent

      default R visitRecordComponent(RecordComponentElement e, P p)
      Visits a record component element.
      Parameters:
      e - the element to visit
      p - a visitor-specified parameter
      Returns:
      a visitor-specified result
      Since:
      16