- Type Parameters:
R
- the return type of this visitor's methodsP
- the type of the additional parameter to this visitor's methods.
- All Known Implementing Classes:
AbstractAnnotationValueVisitor14
,AbstractAnnotationValueVisitor6
,AbstractAnnotationValueVisitor7
,AbstractAnnotationValueVisitor8
,AbstractAnnotationValueVisitor9
,SimpleAnnotationValueVisitor14
,SimpleAnnotationValueVisitor6
,SimpleAnnotationValueVisitor7
,SimpleAnnotationValueVisitor8
,SimpleAnnotationValueVisitor9
boolean
values versus int
values. Classes
implementing this interface are used to operate on a value when the
type of that value is unknown at compile time. When a visitor is
passed to a value's accept
method,
the visitXyz
method applicable to that value 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.
- API Note:
- 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.
Such additions have already occurred in another visitor interface in
this package to support language features added after this API was
introduced.
Visitor classes directly implementing this interface may be source
incompatible with future versions of the platform. To avoid this
source incompatibility, visitor implementations are encouraged to
instead extend the appropriate abstract visitor class that
implements this interface. However, an API should generally use
this visitor interface as the type for parameters, return type,
etc. rather than one of the abstract classes.
Methods to accommodate new language constructs are expected to be added as default methods to provide strong source compatibility, as done for
visitModule
inElementVisitor
. The implementations of the default methods in this interface will in turn callvisitUnknown
, behavior that will be overridden in concrete visitors supporting the source version with the new language construct.There are several families of classes implementing this visitor interface in the util package. The families follow a naming pattern along the lines of
FooVisitor
N where N indicates the source version the visitor is appropriate for. In particular, aFooVisitor
N is expected to handle all language constructs present in source version N. If there are no new language constructs added in version N + 1 (or subsequent releases),FooVisitor
N may also handle that later source version; in that case, theSupportedSourceVersion
annotation on theFooVisitor
N class will indicate a later version. When visiting an annotation value representing a language construct introduced after source version N, aFooVisitor
N will throw anUnknownAnnotationValueException
unless that behavior is overridden.When choosing which member of a visitor family to subclass, subclassing the most recent one increases the range of source versions covered. When choosing which visitor family to subclass, consider their built-in capabilities:
AbstractAnnotationValueVisitor
s: Skeletal visitor implementations.SimpleAnnotationValueVisitor
s: Support default actions and a default return value.
- Since:
- 1.6
-
Method Summary
Modifier and TypeMethodDescriptiondefault R
visit
(AnnotationValue av) A convenience method equivalent tovisit(av, null)
.visit
(AnnotationValue av, P p) Visits an annotation value.visitAnnotation
(AnnotationMirror a, P p) Visits an annotation value in an annotation.visitArray
(List<? extends AnnotationValue> vals, P p) Visits an array value in an annotation.visitBoolean
(boolean b, P p) Visits aboolean
value in an annotation.Visits abyte
value in an annotation.Visits achar
value in an annotation.visitDouble
(double d, P p) Visits adouble
value in an annotation.Visits anenum
value in an annotation.visitFloat
(float f, P p) Visits afloat
value in an annotation.Visits anint
value in an annotation.Visits along
value in an annotation.visitShort
(short s, P p) Visits ashort
value in an annotation.visitString
(String s, P p) Visits a string value in an annotation.visitType
(TypeMirror t, P p) Visits a type value in an annotation.visitUnknown
(AnnotationValue av, P p) Visits an unknown kind of annotation value.
-
Method Details
-
visit
Visits an annotation value.- Parameters:
av
- the value to visitp
- a visitor-specified parameter- Returns:
- a visitor-specified result
-
visit
A convenience method equivalent tovisit(av, null)
.- Implementation Requirements:
- The default implementation is
visit(av, null)
. - Parameters:
av
- the value to visit- Returns:
- a visitor-specified result
-
visitBoolean
Visits aboolean
value in an annotation.- Parameters:
b
- the value being visitedp
- a visitor-specified parameter- Returns:
- the result of the visit
-
visitByte
Visits abyte
value in an annotation.- Parameters:
b
- the value being visitedp
- a visitor-specified parameter- Returns:
- the result of the visit
-
visitChar
Visits achar
value in an annotation.- Parameters:
c
- the value being visitedp
- a visitor-specified parameter- Returns:
- the result of the visit
-
visitDouble
Visits adouble
value in an annotation.- Parameters:
d
- the value being visitedp
- a visitor-specified parameter- Returns:
- the result of the visit
-
visitFloat
Visits afloat
value in an annotation.- Parameters:
f
- the value being visitedp
- a visitor-specified parameter- Returns:
- the result of the visit
-
visitInt
Visits anint
value in an annotation.- Parameters:
i
- the value being visitedp
- a visitor-specified parameter- Returns:
- the result of the visit
-
visitLong
Visits along
value in an annotation.- Parameters:
i
- the value being visitedp
- a visitor-specified parameter- Returns:
- the result of the visit
-
visitShort
Visits ashort
value in an annotation.- Parameters:
s
- the value being visitedp
- a visitor-specified parameter- Returns:
- the result of the visit
-
visitString
Visits a string value in an annotation.- Parameters:
s
- the value being visitedp
- a visitor-specified parameter- Returns:
- the result of the visit
-
visitType
Visits a type value in an annotation.- Parameters:
t
- the value being visitedp
- a visitor-specified parameter- Returns:
- the result of the visit
-
visitEnumConstant
Visits anenum
value in an annotation.- Parameters:
c
- the value being visitedp
- a visitor-specified parameter- Returns:
- the result of the visit
-
visitAnnotation
Visits an annotation value in an annotation.- Parameters:
a
- the value being visitedp
- a visitor-specified parameter- Returns:
- the result of the visit
-
visitArray
Visits an array value in an annotation.- Parameters:
vals
- the value being visitedp
- a visitor-specified parameter- Returns:
- the result of the visit
-
visitUnknown
Visits an unknown kind of annotation value. This can occur if the language evolves and new kinds of value can be stored in an annotation.- Parameters:
av
- the unknown value being visitedp
- a visitor-specified parameter- Returns:
- the result of the visit
- Throws:
UnknownAnnotationValueException
- a visitor implementation may optionally throw this exception
-