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/*
* Copyright 2014 - Present Rafael Winterhalter
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.bytebuddy.utility.visitor;
import net.bytebuddy.utility.nullability.MaybeNull;
import org.objectweb.asm.*;
/**
* A class visitor that traces invocations of visitation methods and notifies if a nest host or outer class was not visited.
*/
public abstract class MetadataAwareClassVisitor extends ClassVisitor {
/**
* {@code true} if the nest host was not yet visited.
*/
private boolean triggerNestHost;
/**
* {@code true} if the outer class was not yet visited.
*/
private boolean triggerOuterClass;
/**
* {@code true} if the attribute visitation is not yet completed.
*/
private boolean triggerAttributes;
/**
* Creates a metadata aware class visitor.
*
* @param api The API version.
* @param classVisitor The class visitor to delegate to.
*/
protected MetadataAwareClassVisitor(int api, ClassVisitor classVisitor) {
super(api, classVisitor);
triggerNestHost = true;
triggerOuterClass = true;
triggerAttributes = true;
}
/**
* Invoked if the nest host was not visited.
*/
protected void onNestHost() {
/* do nothing */
}
/**
* Invoked if the outer class was not visited.
*/
protected void onOuterType() {
/* do nothing */
}
/**
* Invoked if the attribute visitation is about to complete.
*/
protected void onAfterAttributes() {
/* do nothing */
}
/**
* Considers triggering a nest host visitation.
*/
private void considerTriggerNestHost() {
if (triggerNestHost) {
triggerNestHost = false;
onNestHost();
}
}
/**
* Considers triggering an outer class visitation.
*/
private void considerTriggerOuterClass() {
if (triggerOuterClass) {
triggerOuterClass = false;
onOuterType();
}
}
/**
* Considers triggering the after attribute visitation.
*/
private void considerTriggerAfterAttributes() {
if (triggerAttributes) {
triggerAttributes = false;
onAfterAttributes();
}
}
@Override
public final void visitNestHost(String nestHost) {
triggerNestHost = false;
onVisitNestHost(nestHost);
}
/**
* An order-sensitive invocation of {@link ClassVisitor#visitNestHost(String)}.
*
* @param nestHost The internal name of the nest host.
*/
protected void onVisitNestHost(String nestHost) {
super.visitNestHost(nestHost);
}
@Override
public final void visitOuterClass(String owner, @MaybeNull String name, @MaybeNull String descriptor) {
considerTriggerNestHost();
triggerOuterClass = false;
onVisitOuterClass(owner, name, descriptor);
}
/**
* An order-sensitive invocation of {@link ClassVisitor#visitOuterClass(String, String, String)}.
*
* @param owner The outer class's internal name.
* @param name The outer method's name or {@code null} if it does not exist.
* @param descriptor The outer method's descriptor or {@code null} if it does not exist.
*/
protected void onVisitOuterClass(String owner, @MaybeNull String name, @MaybeNull String descriptor) {
super.visitOuterClass(owner, name, descriptor);
}
@Override
public final void visitPermittedSubclass(String permittedSubclass) {
considerTriggerNestHost();
considerTriggerOuterClass();
considerTriggerAfterAttributes();
onVisitPermittedSubclass(permittedSubclass);
}
/**
* An order-sensitive invocation of {@code ClassVisitor#visitPermittedSubclass}.
*
* @param permittedSubclass The internal name of the permitted subclass.
*/
protected void onVisitPermittedSubclass(String permittedSubclass) {
super.visitPermittedSubclass(permittedSubclass);
}
@Override
@MaybeNull
public RecordComponentVisitor visitRecordComponent(String name, String descriptor, @MaybeNull String signature) {
considerTriggerNestHost();
considerTriggerOuterClass();
considerTriggerAfterAttributes();
return onVisitRecordComponent(name, descriptor, signature);
}
/**
* An order-sensitive invocation of {@link ClassVisitor#visitRecordComponent(String, String, String)}.
*
* @param name The record component's name.
* @param descriptor The record component's descriptor.
* @param signature The record component's generic signature or {@code null} if the record component's type is non-generic.
* @return The record component visitor or {@code null} if the component should not be visited.
*/
@MaybeNull
protected RecordComponentVisitor onVisitRecordComponent(String name, String descriptor, @MaybeNull String signature) {
return super.visitRecordComponent(name, descriptor, signature);
}
@Override
@MaybeNull
public final AnnotationVisitor visitAnnotation(String descriptor, boolean visible) {
considerTriggerNestHost();
considerTriggerOuterClass();
return onVisitAnnotation(descriptor, visible);
}
/**
* An order-sensitive invocation of {@link ClassVisitor#visitAnnotation(String, boolean)}.
*
* @param descriptor The annotation type's descriptor.
* @param visible {@code true} if the annotation is visible at runtime.
* @return An annotation visitor or {@code null} if the annotation should be ignored.
*/
@MaybeNull
protected AnnotationVisitor onVisitAnnotation(String descriptor, boolean visible) {
return super.visitAnnotation(descriptor, visible);
}
@Override
@MaybeNull
public final AnnotationVisitor visitTypeAnnotation(int typeReference, TypePath typePath, String descriptor, boolean visible) {
considerTriggerNestHost();
considerTriggerOuterClass();
return onVisitTypeAnnotation(typeReference, typePath, descriptor, visible);
}
/**
* An order-sensitive invocation of {@link ClassVisitor#visitTypeAnnotation(int, TypePath, String, boolean)}.
*
* @param typeReference The type reference of the type annotation.
* @param typePath The type path of the type annotation.
* @param descriptor The descriptor of the annotation type.
* @param visible {@code true} if the annotation is visible at runtime.
* @return An annotation visitor or {@code null} if the annotation should be ignored.
*/
@MaybeNull
protected AnnotationVisitor onVisitTypeAnnotation(int typeReference, TypePath typePath, String descriptor, boolean visible) {
return super.visitTypeAnnotation(typeReference, typePath, descriptor, visible);
}
@Override
public final void visitAttribute(Attribute attribute) {
considerTriggerNestHost();
considerTriggerOuterClass();
onVisitAttribute(attribute);
}
/**
* An order-sensitive invocation of {@link ClassVisitor#visitAttribute(Attribute)}.
*
* @param attribute The attribute to visit.
*/
protected void onVisitAttribute(Attribute attribute) {
super.visitAttribute(attribute);
}
@Override
public final void visitNestMember(String nestMember) {
considerTriggerNestHost();
considerTriggerOuterClass();
considerTriggerAfterAttributes();
onVisitNestMember(nestMember);
}
/**
* An order-sensitive invocation of {@link ClassVisitor#visitNestMember(String)}.
*
* @param nestMember The internal name of the nest member.
*/
protected void onVisitNestMember(String nestMember) {
super.visitNestMember(nestMember);
}
@Override
public final void visitInnerClass(String name, @MaybeNull String outerName, @MaybeNull String innerName, int modifiers) {
considerTriggerNestHost();
considerTriggerOuterClass();
considerTriggerAfterAttributes();
onVisitInnerClass(name, outerName, innerName, modifiers);
}
/**
* An order-sensitive invocation of {@link ClassVisitor#visitInnerClass(String, String, String, int)}.
*
* @param internalName The internal name of the inner class.
* @param outerName The internal name of the outer class or {@code null} for a member class.
* @param innerName The inner class's simple name or {@code null} for an anonymous class.
* @param modifiers The inner class's source code modifiers.
*/
protected void onVisitInnerClass(String internalName, @MaybeNull String outerName, @MaybeNull String innerName, int modifiers) {
super.visitInnerClass(internalName, outerName, innerName, modifiers);
}
@Override
@MaybeNull
public final FieldVisitor visitField(int modifiers, String internalName, String descriptor, @MaybeNull String signature, @MaybeNull Object value) {
considerTriggerNestHost();
considerTriggerOuterClass();
considerTriggerAfterAttributes();
return onVisitField(modifiers, internalName, descriptor, signature, value);
}
/**
* An order-sensitive invocation of {@link ClassVisitor#visitField(int, String, String, String, Object)}.
*
* @param modifiers The field's modifiers.
* @param internalName The field's internal name.
* @param descriptor The field type's descriptor.
* @param signature The field's generic signature or {@code null} if the field is not generic.
* @param value The field's default value or {@code null} if no such value exists.
* @return A field visitor to visit the field or {@code null} to ignore it.
*/
@MaybeNull
protected FieldVisitor onVisitField(int modifiers, String internalName, String descriptor, @MaybeNull String signature, @MaybeNull Object value) {
return super.visitField(modifiers, internalName, descriptor, signature, value);
}
@Override
@MaybeNull
public final MethodVisitor visitMethod(int modifiers, String internalName, String descriptor, @MaybeNull String signature, @MaybeNull String[] exception) {
considerTriggerNestHost();
considerTriggerOuterClass();
considerTriggerAfterAttributes();
return onVisitMethod(modifiers, internalName, descriptor, signature, exception);
}
/**
* An order-sensitive invocation of {@link ClassVisitor#visitMethod(int, String, String, String, String[])}.
*
* @param modifiers The method's modifiers.
* @param internalName The method's internal name.
* @param descriptor The field type's descriptor.
* @param signature The method's generic signature or {@code null} if the method is not generic.
* @param exception The method's declared exceptions or {@code null} if no exceptions are declared.
* @return A method visitor to visit the method or {@code null} to ignore it.
*/
@MaybeNull
protected MethodVisitor onVisitMethod(int modifiers, String internalName, String descriptor, @MaybeNull String signature, @MaybeNull String[] exception) {
return super.visitMethod(modifiers, internalName, descriptor, signature, exception);
}
@Override
public final void visitEnd() {
considerTriggerNestHost();
considerTriggerOuterClass();
considerTriggerAfterAttributes();
onVisitEnd();
}
/**
* An order-sensitive invocation of {@link ClassVisitor#visitEnd()}.
*/
protected void onVisitEnd() {
super.visitEnd();
}
}
