71  * classes which extend this class should not declare any instance
  72  * methods with names beginning with {@code "visit"}.
  73  *
  74  * <p>When such a new visit method is added, the default
  75  * implementation in this class will be to call the {@link
  76  * #visitUnknown visitUnknown} method.  A new element scanner visitor
  77  * class will also be introduced to correspond to the new language
  78  * level; this visitor will have different default behavior for the
  79  * visit method in question.  When the new visitor is introduced, all
  80  * or portions of this visitor may be deprecated.
  81  *
  82  * @param <R> the return type of this visitor's methods.  Use {@link
  83  *            Void} for visitors that do not need to return results.
  84  * @param <P> the type of the additional parameter to this visitor's
  85  *            methods.  Use {@code Void} for visitors that do not need an
  86  *            additional parameter.
  87  *
  88  * @author Joseph D. Darcy
  89  * @author Scott Seligman
  90  * @author Peter von der Ah&eacute;


  91  * @since 1.6
  92  */
  93 @SupportedSourceVersion(RELEASE_6)
  94 public class ElementScanner6<R, P> extends AbstractElementVisitor6<R, P> {
  95     /**
  96      * The specified default value.
  97      */
  98     protected final R DEFAULT_VALUE;
  99 
 100     /**
 101      * Constructor for concrete subclasses; uses {@code null} for the
 102      * default value.
 103      */
 104     protected ElementScanner6(){
 105         DEFAULT_VALUE = null;
 106     }
 107 
 108     /**
 109      * Constructor for concrete subclasses; uses the argument for the
 110      * default value.

  71  * classes which extend this class should not declare any instance
  72  * methods with names beginning with {@code "visit"}.
  73  *
  74  * <p>When such a new visit method is added, the default
  75  * implementation in this class will be to call the {@link
  76  * #visitUnknown visitUnknown} method.  A new element scanner visitor
  77  * class will also be introduced to correspond to the new language
  78  * level; this visitor will have different default behavior for the
  79  * visit method in question.  When the new visitor is introduced, all
  80  * or portions of this visitor may be deprecated.
  81  *
  82  * @param <R> the return type of this visitor's methods.  Use {@link
  83  *            Void} for visitors that do not need to return results.
  84  * @param <P> the type of the additional parameter to this visitor's
  85  *            methods.  Use {@code Void} for visitors that do not need an
  86  *            additional parameter.
  87  *
  88  * @author Joseph D. Darcy
  89  * @author Scott Seligman
  90  * @author Peter von der Ah&eacute;
  91  *
  92  * @see ElementScanner7
  93  * @since 1.6
  94  */
  95 @SupportedSourceVersion(RELEASE_6)
  96 public class ElementScanner6<R, P> extends AbstractElementVisitor6<R, P> {
  97     /**
  98      * The specified default value.
  99      */
 100     protected final R DEFAULT_VALUE;
 101 
 102     /**
 103      * Constructor for concrete subclasses; uses {@code null} for the
 104      * default value.
 105      */
 106     protected ElementScanner6(){
 107         DEFAULT_VALUE = null;
 108     }
 109 
 110     /**
 111      * Constructor for concrete subclasses; uses the argument for the
 112      * default value.