What are AnnotationVisitor and SignatureVisitor?
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Brief introduction
AnnotationVisitor is used to access Annotation, and SignatureVisitor is used to access signatures.
AnnotationVisitor
The order of AnnotationVisitor access is as follows:
(visit | visitEnum | visitAnnotation | code visitArray) * visitEnd.
() * can be accessed multiple times, but visitEnd can only be accessed once
Visit: access the basic values of annotations
VisitEnum: access the enumerated type values of annotations
VisitAnnotation: access nested annotation types, that is, one annotation may be annotated by other annotations
VisitArray: access the array values of annotations
VisitEnd: end of access notification
SignatureVisitor
SignatureVisitor is used to access generic types in the following order:
Class signature ClassSignature: (visitFormalTypeParameter visitClassBound?
VisitInterfaceBound*) * (visitSuperclass visitInterface*)
Method signature MethodSignature: (visitFormalTypeParameter visitClassBound?
VisitInterfaceBound*) * (visitParameterType* visitReturnType visitExceptionType*)
Domain signature FieldSignature: visitBaseType | visitTypeVariable | visitArrayType | (visitClassType visitTypeArgument* (visitInnerClassType visitTypeArgument*) * visitEnd))
VisitFormalTypeParameter (final String name): access to regular type parameters
VisitClassBound: access to the class bounds of the last accessed regular type parameter
VisitInterfaceBound: interface bounds for accessing the last accessed regular type parameter
VisitSuperclass: access the superclass of this type
VisitInterface: access the interface implemented by this class
VisitParameterType: access method parameter type
VisitReturnType: the type of value returned by the access method
VisitExceptionType: access method exception type
VisitBaseType: access to basic types of signatures
VisitTypeVariable: access the signature of a type variable
VisitArrayType: access a signature of an array type
VisitClassType: start to access the signature of a class or interface type
VisitInnerClassType: access inner classes
VisitTypeArgument: access the unbounded type parameter of the last accessed class or interface
VisitTypeArgument (final char wildcard): access the type parameters of the last accessed class or inner class
VisitEnd: end of access notification
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