Interface TypeVisitor<R,P> 
- Type Parameters:
- R- the return type of this visitor's methods. Use- Voidfor visitors that do not need to return results.
- P- the type of the additional parameter to this visitor's methods. Use- Voidfor visitors that do not need an additional parameter.
- All Known Implementing Classes:
- AbstractTypeVisitor14,- AbstractTypeVisitor6,- AbstractTypeVisitor7,- AbstractTypeVisitor8,- AbstractTypeVisitor9,- AbstractTypeVisitorPreviewPREVIEW,- SimpleTypeVisitor14,- SimpleTypeVisitor6,- SimpleTypeVisitor7,- SimpleTypeVisitor8,- SimpleTypeVisitor9,- SimpleTypeVisitorPreviewPREVIEW,- TypeKindVisitor14,- TypeKindVisitor6,- TypeKindVisitor7,- TypeKindVisitor8,- TypeKindVisitor9,- TypeKindVisitorPreviewPREVIEW
accept method, the visitXyz
 method most applicable to that type 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 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. The implementations of the default methods will in turn call visitUnknown, 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 FooVisitorN where N indicates the source version the visitor is appropriate for. In particular, aFooVisitorN 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),FooVisitorN may also handle that later source version; in that case, theSupportedSourceVersionannotation on theFooVisitorN class will indicate a later version. When visiting a type representing a language construct introduced after source version N, aFooVisitorN will throw anUnknownTypeExceptionunless 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: - AbstractTypeVisitors: Skeletal visitor implementations.
- SimpleTypeVisitors: Support default actions and a default return value.
- TypeKindVisitors: Visit methods provided on a per-kind granularity as some categories of types can have more than one kind.
 
- Since:
- 1.6
- 
Method SummaryModifier and TypeMethodDescriptiondefault Rvisit(TypeMirror t) A convenience method equivalent tovisit(t, null).visit(TypeMirror t, P p) Visits a type.visitArray(ArrayType t, P p) Visits an array type.visitDeclared(DeclaredType t, P p) Visits a declared type.visitError(ErrorType t, P p) Visits an error type.visitExecutable(ExecutableType t, P p) Visits an executable type.Visits an intersection type.visitNoType(NoType t, P p) Visits aNoTypeinstance.Visits the null type.visitPrimitive(PrimitiveType t, P p) Visits a primitive type.visitTypeVariable(TypeVariable t, P p) Visits a type variable.visitUnion(UnionType t, P p) Visits a union type.visitUnknown(TypeMirror t, P p) Visits an unknown kind of type.visitWildcard(WildcardType t, P p) Visits a wildcard type.
- 
Method Details- 
visitVisits a type.- Parameters:
- t- the type to visit
- p- a visitor-specified parameter
- Returns:
- a visitor-specified result
 
- 
visitA convenience method equivalent tovisit(t, null).- Implementation Requirements:
- The default implementation is visit(t, null).
- Parameters:
- t- the element to visit
- Returns:
- a visitor-specified result
 
- 
visitPrimitiveVisits a primitive type.- Parameters:
- t- the type to visit
- p- a visitor-specified parameter
- Returns:
- a visitor-specified result
 
- 
visitNull
- 
visitArray
- 
visitDeclaredVisits a declared type.- Parameters:
- t- the type to visit
- p- a visitor-specified parameter
- Returns:
- a visitor-specified result
 
- 
visitError
- 
visitTypeVariableVisits a type variable.- Parameters:
- t- the type to visit
- p- a visitor-specified parameter
- Returns:
- a visitor-specified result
 
- 
visitWildcardVisits a wildcard type.- Parameters:
- t- the type to visit
- p- a visitor-specified parameter
- Returns:
- a visitor-specified result
 
- 
visitExecutableVisits an executable type.- Parameters:
- t- the type to visit
- p- a visitor-specified parameter
- Returns:
- a visitor-specified result
 
- 
visitNoType
- 
visitUnknownVisits an unknown kind of type. This can occur if the language evolves and new kinds of types are added to theTypeMirrorhierarchy.- Parameters:
- t- the type to visit
- p- a visitor-specified parameter
- Returns:
- a visitor-specified result
- Throws:
- UnknownTypeException- a visitor implementation may optionally throw this exception
 
- 
visitUnion
- 
visitIntersectionVisits an intersection type.- Parameters:
- t- the type to visit
- p- a visitor-specified parameter
- Returns:
- a visitor-specified result
- Since:
- 1.8
 
 
-