Class ElementScanner9<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 Implemented Interfaces:
Direct Known Subclasses:

@SupportedSourceVersion(RELEASE_14) public class ElementScanner9<R,​P> extends ElementScanner8<R,​P>
A scanning visitor of program elements with default behavior appropriate for source versions RELEASE_9 through RELEASE_14. The visitXyz methods in this class scan their component elements by calling scan on their enclosed elements, parameters, etc., as indicated in the individual method specifications. A subclass can control the order elements are visited by overriding the visitXyz methods. Note that clients of a scanner may get the desired behavior be invoking v.scan(e, p) rather than v.visit(e, p) on the root objects of interest.

When a subclass overrides a visitXyz method, the new method can cause the enclosed elements to be scanned in the default way by calling super.visitXyz. In this fashion, the concrete visitor can control the ordering of traversal over the component elements with respect to the additional processing; for example, consistently calling super.visitXyz at the start of the overridden methods will yield a preorder traversal, etc. If the component elements should be traversed in some other order, instead of calling super.visitXyz, an overriding visit method should call scan with the elements in the desired order.

API Note:
Methods in this class may be overridden subject to their general contract.
See Also:
Compatibility note for subclasses, ElementScanner6, ElementScanner7, ElementScanner8, ElementScanner14
  • Constructor Details

    • ElementScanner9

      protected ElementScanner9()
      Constructor for concrete subclasses; uses null for the default value.
    • ElementScanner9

      protected ElementScanner9(R defaultValue)
      Constructor for concrete subclasses; uses the argument for the default value.
      defaultValue - the default value
  • Method Details

    • visitModule

      public R visitModule(ModuleElement e, P p)
      Visits a module element.
      Specified by:
      visitModule in interface ElementVisitor<R,​P>
      visitModule in class AbstractElementVisitor6<R,​P>
      Implementation Requirements:
      This implementation scans the enclosed elements.
      e - the element to visit
      p - a visitor-specified parameter
      the result of the scan