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This article mainly explains "what is AnnotationVisitor and SignatureVisitor". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what is AnnotationVisitor and SignatureVisitor".

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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