Top Description Fields Constructors Methods
net.bytebuddy.jar.asm

public abstract Class ClassVisitor

extends Object
Class Inheritance
Known Direct Subclasses
net.bytebuddy.jar.asm.ClassWriter, net.bytebuddy.jar.asm.commons.ClassRemapper, net.bytebuddy.pool.TypePool.Default.TypeExtractor, net.bytebuddy.utility.visitor.ContextClassVisitor, net.bytebuddy.utility.visitor.MetadataAwareClassVisitor, net.bytebuddy.asm.Advice.Dispatcher.Inlining.Resolved.AdviceMethodInliner, net.bytebuddy.asm.Advice.Dispatcher.Inlining.Resolved.AdviceMethodInliner.ExceptionTableExtractor, net.bytebuddy.asm.AsmVisitorWrapper.ForDeclaredFields.DispatchingVisitor, net.bytebuddy.asm.AsmVisitorWrapper.ForDeclaredMethods.DispatchingVisitor, net.bytebuddy.asm.MemberRemoval.MemberRemovingClassVisitor, net.bytebuddy.asm.ModifierAdjustment.ModifierAdjustingClassVisitor, net.bytebuddy.asm.TypeConstantAdjustment.TypeConstantDissolvingClassVisitor, net.bytebuddy.asm.TypeReferenceAdjustment.TypeReferenceClassVisitor, net.bytebuddy.dynamic.scaffold.TypeWriter.Default.ValidatingClassVisitor

A visitor to visit a Java class. The methods of this class must be called in the following order: visit [ visitSource ] [ visitModule ][ visitNestHost ][ visitOuterClass ] ( visitAnnotation | visitTypeAnnotation | visitAttribute )* ( visitNestMember | [ * visitPermittedSubclass ] | visitInnerClass | visitRecordComponent | visitField | visitMethod )* visitEnd.
Author
Eric Bruneton

Field Summary

Modifier and TypeField and Description
protected final int
api

The ASM API version implemented by this visitor.

protected ClassVisitor
cv

The class visitor to which this visitor must delegate method calls.

Constructor Summary

AccessConstructor and Description
protected
ClassVisitor(final int
the ASM API version implemented by this visitor. Must be one of the ASMx values in Opcodes.
api
)

Constructs a new ClassVisitor.

protected
ClassVisitor(final int
the ASM API version implemented by this visitor. Must be one of the ASMx values in Opcodes.
api
,
final ClassVisitor
the class visitor to which this visitor must delegate method calls. May be null.
classVisitor
)

Constructs a new ClassVisitor.

Method Summary

Modifier and TypeMethod and Description
public ClassVisitor

Returns:

the class visitor to which this visitor must delegate method calls, or null.
getDelegate
()

The class visitor to which this visitor must delegate method calls.

public void
visit(final int
the class version. The minor version is stored in the 16 most significant bits, and the major version in the 16 least significant bits.
version
,
final int
the class's access flags (see Opcodes). This parameter also indicates if the class is deprecated Opcodes#ACC_DEPRECATED or a record Opcodes#ACC_RECORD.
access
,
final String
the internal name of the class (see Type#getInternalName()).
name
,
final String
the signature of this class. May be null if the class is not a generic one, and does not extend or implement generic classes or interfaces.
signature
,
final String
the internal of name of the super class (see Type#getInternalName()). For interfaces, the super class is Object. May be null, but only for the Object class.
superName
,
final String[]
the internal names of the class's interfaces (see Type#getInternalName()). May be null.
interfaces
)

Visits the header of the class.

public AnnotationVisitor

Returns:

a visitor to visit the annotation values, or null if this visitor is not interested in visiting this annotation.
visitAnnotation
(final String
the class descriptor of the annotation class.
descriptor
,
final boolean
true if the annotation is visible at runtime.
visible
)

Visits an annotation of the class.

public void
visitAttribute(final Attribute
an attribute.
attribute
)

Visits a non standard attribute of the class.

public void
visitEnd()

Visits the end of the class.

public FieldVisitor

Returns:

a visitor to visit field annotations and attributes, or null if this class visitor is not interested in visiting these annotations and attributes.
visitField
(final int
the field's access flags (see Opcodes). This parameter also indicates if the field is synthetic and/or deprecated.
access
,
final String
the field's name.
name
,
final String
the field's descriptor (see Type).
descriptor
,
final String
the field's signature. May be null if the field's type does not use generic types.
signature
,
final Object
the field's initial value. This parameter, which may be null if the field does not have an initial value, must be an Integer, a Float, a Long, a Double or a String (for int, float, long or String fields respectively). This parameter is only used for static fields. Its value is ignored for non static fields, which must be initialized through bytecode instructions in constructors or methods.
value
)

Visits a field of the class.

public void
visitInnerClass(final String
the internal name of C (see Type#getInternalName()).
name
,
final String
the internal name of the class or interface C is a member of (see Type#getInternalName()). Must be null if C is not the member of a class or interface (e.g. for local or anonymous classes).
outerName
,
final String
the (simple) name of C. Must be null for anonymous inner classes.
innerName
,
final int
the access flags of C originally declared in the source code from which this class was compiled.
access
)

Visits information about an inner class.

public MethodVisitor

Returns:

an object to visit the byte code of the method, or null if this class visitor is not interested in visiting the code of this method.
visitMethod
(final int
the method's access flags (see Opcodes). This parameter also indicates if the method is synthetic and/or deprecated.
access
,
final String
the method's name.
name
,
final String
the method's descriptor (see Type).
descriptor
,
final String
the method's signature. May be null if the method parameters, return type and exceptions do not use generic types.
signature
,
final String[]
the internal names of the method's exception classes (see Type#getInternalName()). May be null.
exceptions
)

Visits a method of the class.

public ModuleVisitor

Returns:

a visitor to visit the module values, or null if this visitor is not interested in visiting this module.
visitModule
(final String
the fully qualified name (using dots) of the module.
name
,
final int
the module access flags, among ACC_OPEN, ACC_SYNTHETIC and ACC_MANDATED.
access
,
final String
the module version, or null.
version
)

Visit the module corresponding to the class.

public void
visitNestHost(final String
the internal name of the host class of the nest (see Type#getInternalName()).
nestHost
)

Visits the nest host class of the class.

public void
visitNestMember(final String
the internal name of a nest member (see Type#getInternalName()).
nestMember
)

Visits a member of the nest.

public void
visitOuterClass(final String
internal name of the enclosing class of the class (see Type#getInternalName()).
owner
,
final String
the name of the method that contains the class, or null if the class is not enclosed in a method or constructor of its enclosing class (e.g. if it is enclosed in an instance initializer, static initializer, instance variable initializer, or class variable initializer).
name
,
final String
the descriptor of the method that contains the class, or null if the class is not enclosed in a method or constructor of its enclosing class (e.g. if it is enclosed in an instance initializer, static initializer, instance variable initializer, or class variable initializer).
descriptor
)

Visits the enclosing class of the class.

public void
visitPermittedSubclass(final String
the internal name of a permitted subclass (see Type#getInternalName()).
permittedSubclass
)

Visits a permitted subclasses.

public RecordComponentVisitor

Returns:

a visitor to visit this record component annotations and attributes, or null if this class visitor is not interested in visiting these annotations and attributes.
visitRecordComponent
(final String
the record component name.
name
,
final String
the record component descriptor (see Type).
descriptor
,
final String
the record component signature. May be null if the record component type does not use generic types.
signature
)

Visits a record component of the class.

public void
visitSource(final String
the name of the source file from which the class was compiled. May be null.
source
,
final String
additional debug information to compute the correspondence between source and compiled elements of the class. May be null.
debug
)

Visits the source of the class.

public AnnotationVisitor

Returns:

a visitor to visit the annotation values, or null if this visitor is not interested in visiting this annotation.
visitTypeAnnotation
(final int
a reference to the annotated type. The sort of this type reference must be TypeReference#CLASS_TYPE_PARAMETER, TypeReference#CLASS_TYPE_PARAMETER_BOUND or TypeReference#CLASS_EXTENDS. See TypeReference.
typeRef
,
final TypePath
the path to the annotated type argument, wildcard bound, array element type, or static inner type within 'typeRef'. May be null if the annotation targets 'typeRef' as a whole.
typePath
,
final String
the class descriptor of the annotation class.
descriptor
,
final boolean
true if the annotation is visible at runtime.
visible
)

Visits an annotation on a type in the class signature.

Inherited from java.lang.Object:
cloneequalsfinalizegetClasshashCodenotifynotifyAlltoStringwaitwaitwait

Field Detail

apiback to summary
protected final int api

The ASM API version implemented by this visitor. The value of this field must be one of the ASMx values in Opcodes.

cvback to summary
protected ClassVisitor cv

The class visitor to which this visitor must delegate method calls. May be null.

Constructor Detail

ClassVisitorback to summary
protected ClassVisitor(final int api)

Constructs a new ClassVisitor.

Parameters
api:int

the ASM API version implemented by this visitor. Must be one of the ASMx values in Opcodes.

ClassVisitorback to summary
protected ClassVisitor(final int api, final ClassVisitor classVisitor)

Constructs a new ClassVisitor.

Parameters
api:int

the ASM API version implemented by this visitor. Must be one of the ASMx values in Opcodes.

classVisitor:ClassVisitor

the class visitor to which this visitor must delegate method calls. May be null.

Method Detail

getDelegateback to summary
public ClassVisitor getDelegate()

The class visitor to which this visitor must delegate method calls. May be null.

Returns:ClassVisitor

the class visitor to which this visitor must delegate method calls, or null.

visitback to summary
public void visit(final int version, final int access, final String name, final String signature, final String superName, final String[] interfaces)

Visits the header of the class.

Parameters
version:int

the class version. The minor version is stored in the 16 most significant bits, and the major version in the 16 least significant bits.

access:int

the class's access flags (see Opcodes). This parameter also indicates if the class is deprecated Opcodes#ACC_DEPRECATED or a record Opcodes#ACC_RECORD.

name:String

the internal name of the class (see Type#getInternalName()).

signature:String

the signature of this class. May be null if the class is not a generic one, and does not extend or implement generic classes or interfaces.

superName:String

the internal of name of the super class (see Type#getInternalName()). For interfaces, the super class is Object. May be null, but only for the Object class.

interfaces:String[]

the internal names of the class's interfaces (see Type#getInternalName()). May be null.

visitAnnotationback to summary
public AnnotationVisitor visitAnnotation(final String descriptor, final boolean visible)

Visits an annotation of the class.

Parameters
descriptor:String

the class descriptor of the annotation class.

visible:boolean

true if the annotation is visible at runtime.

Returns:AnnotationVisitor

a visitor to visit the annotation values, or null if this visitor is not interested in visiting this annotation.

visitAttributeback to summary
public void visitAttribute(final Attribute attribute)

Visits a non standard attribute of the class.

Parameters
attribute:Attribute

an attribute.

visitEndback to summary
public void visitEnd()

Visits the end of the class. This method, which is the last one to be called, is used to inform the visitor that all the fields and methods of the class have been visited.

visitFieldback to summary
public FieldVisitor visitField(final int access, final String name, final String descriptor, final String signature, final Object value)

Visits a field of the class.

Parameters
access:int

the field's access flags (see Opcodes). This parameter also indicates if the field is synthetic and/or deprecated.

name:String

the field's name.

descriptor:String

the field's descriptor (see Type).

signature:String

the field's signature. May be null if the field's type does not use generic types.

value:Object

the field's initial value. This parameter, which may be null if the field does not have an initial value, must be an Integer, a Float, a Long, a Double or a String (for int, float, long or String fields respectively). This parameter is only used for static fields. Its value is ignored for non static fields, which must be initialized through bytecode instructions in constructors or methods.

Returns:FieldVisitor

a visitor to visit field annotations and attributes, or null if this class visitor is not interested in visiting these annotations and attributes.

visitInnerClassback to summary
public void visitInnerClass(final String name, final String outerName, final String innerName, final int access)

Visits information about an inner class. This inner class is not necessarily a member of the class being visited. More precisely, every class or interface C which is referenced by this class and which is not a package member must be visited with this method. This class must reference its nested class or interface members, and its enclosing class, if any. See the JVMS 4.7.6 section for more details.

Parameters
name:String

the internal name of C (see Type#getInternalName()).

outerName:String

the internal name of the class or interface C is a member of (see Type#getInternalName()). Must be null if C is not the member of a class or interface (e.g. for local or anonymous classes).

innerName:String

the (simple) name of C. Must be null for anonymous inner classes.

access:int

the access flags of C originally declared in the source code from which this class was compiled.

visitMethodback to summary
public MethodVisitor visitMethod(final int access, final String name, final String descriptor, final String signature, final String[] exceptions)

Visits a method of the class. This method must return a new MethodVisitor instance (or null) each time it is called, i.e., it should not return a previously returned visitor.

Parameters
access:int

the method's access flags (see Opcodes). This parameter also indicates if the method is synthetic and/or deprecated.

name:String

the method's name.

descriptor:String

the method's descriptor (see Type).

signature:String

the method's signature. May be null if the method parameters, return type and exceptions do not use generic types.

exceptions:String[]

the internal names of the method's exception classes (see Type#getInternalName()). May be null.

Returns:MethodVisitor

an object to visit the byte code of the method, or null if this class visitor is not interested in visiting the code of this method.

visitModuleback to summary
public ModuleVisitor visitModule(final String name, final int access, final String version)

Visit the module corresponding to the class.

Parameters
name:String

the fully qualified name (using dots) of the module.

access:int

the module access flags, among ACC_OPEN, ACC_SYNTHETIC and ACC_MANDATED.

version:String

the module version, or null.

Returns:ModuleVisitor

a visitor to visit the module values, or null if this visitor is not interested in visiting this module.

visitNestHostback to summary
public void visitNestHost(final String nestHost)

Visits the nest host class of the class. A nest is a set of classes of the same package that share access to their private members. One of these classes, called the host, lists the other members of the nest, which in turn should link to the host of their nest. This method must be called only once and only if the visited class is a non-host member of a nest. A class is implicitly its own nest, so it's invalid to call this method with the visited class name as argument.

Parameters
nestHost:String

the internal name of the host class of the nest (see Type#getInternalName()).

visitNestMemberback to summary
public void visitNestMember(final String nestMember)

Visits a member of the nest. A nest is a set of classes of the same package that share access to their private members. One of these classes, called the host, lists the other members of the nest, which in turn should link to the host of their nest. This method must be called only if the visited class is the host of a nest. A nest host is implicitly a member of its own nest, so it's invalid to call this method with the visited class name as argument.

Parameters
nestMember:String

the internal name of a nest member (see Type#getInternalName()).

visitOuterClassback to summary
public void visitOuterClass(final String owner, final String name, final String descriptor)

Visits the enclosing class of the class. This method must be called only if this class is a local or anonymous class. See the JVMS 4.7.7 section for more details.

Parameters
owner:String

internal name of the enclosing class of the class (see Type#getInternalName()).

name:String

the name of the method that contains the class, or null if the class is not enclosed in a method or constructor of its enclosing class (e.g. if it is enclosed in an instance initializer, static initializer, instance variable initializer, or class variable initializer).

descriptor:String

the descriptor of the method that contains the class, or null if the class is not enclosed in a method or constructor of its enclosing class (e.g. if it is enclosed in an instance initializer, static initializer, instance variable initializer, or class variable initializer).

visitPermittedSubclassback to summary
public void visitPermittedSubclass(final String permittedSubclass)

Visits a permitted subclasses. A permitted subclass is one of the allowed subclasses of the current class.

Parameters
permittedSubclass:String

the internal name of a permitted subclass (see Type#getInternalName()).

visitRecordComponentback to summary
public RecordComponentVisitor visitRecordComponent(final String name, final String descriptor, final String signature)

Visits a record component of the class.

Parameters
name:String

the record component name.

descriptor:String

the record component descriptor (see Type).

signature:String

the record component signature. May be null if the record component type does not use generic types.

Returns:RecordComponentVisitor

a visitor to visit this record component annotations and attributes, or null if this class visitor is not interested in visiting these annotations and attributes.

visitSourceback to summary
public void visitSource(final String source, final String debug)

Visits the source of the class.

Parameters
source:String

the name of the source file from which the class was compiled. May be null.

debug:String

additional debug information to compute the correspondence between source and compiled elements of the class. May be null.

visitTypeAnnotationback to summary
public AnnotationVisitor visitTypeAnnotation(final int typeRef, final TypePath typePath, final String descriptor, final boolean visible)

Visits an annotation on a type in the class signature.

Parameters
typeRef:int

a reference to the annotated type. The sort of this type reference must be TypeReference#CLASS_TYPE_PARAMETER, TypeReference#CLASS_TYPE_PARAMETER_BOUND or TypeReference#CLASS_EXTENDS. See TypeReference.

typePath:TypePath

the path to the annotated type argument, wildcard bound, array element type, or static inner type within 'typeRef'. May be null if the annotation targets 'typeRef' as a whole.

descriptor:String

the class descriptor of the annotation class.

visible:boolean

true if the annotation is visible at runtime.

Returns:AnnotationVisitor

a visitor to visit the annotation values, or null if this visitor is not interested in visiting this annotation.