Class EnhancerMethodAdapter

java.lang.Object

org.datanucleus.enhancer.asm.MethodVisitor

org.datanucleus.enhancer.EnhancerMethodAdapter

public class EnhancerMethodAdapter
extends MethodVisitor

Adapter for methods in persistence-enabled classes allowing enhancement of direct access to user fields. Currently performs the following updates

• Any GETFIELD on a field of a Persistable class is replaced by a call to dnGetXXX()
• Any PUTFIELD on a field of a Persistable class is replaced by a call to dnSetXXX()
• Any clone() method that has no superclass but calls clone() is changed to call dnSuperClone()
• Any static class initialisation adds on the "InitClass" instructions
• Any user-provided "writeObject" method will have "dnPreSerialize" added before the user method code.

Field Summary

Fields

Modifier and Type	Field	Description
protected ClassEnhancer	enhancer	The enhancer for this class.
(package private) boolean	firstLabel
protected String	methodDescriptor	Descriptor for the method being adapted.
protected String	methodName	Name for the method being adapted.

Fields inherited from class MethodVisitor

api, mv

Constructor Summary

Constructors

Constructor	Description
EnhancerMethodAdapter(MethodVisitor mv, ClassEnhancer enhancer, String methodName, String methodDesc)	Constructor for the method adapter.

Method Summary

Modifier and Type	Method	Description
void	visitFieldInsn(int opcode, String owner, String name, String desc)	Method to intercept any calls to fields.
void	visitInsn(int opcode)	Method to intercept any general instructions.
void	visitLabel(Label label)	Visits a label.

Methods inherited from class MethodVisitor

getDelegate, visitAnnotableParameterCount, visitAnnotation, visitAnnotationDefault, visitAttribute, visitCode, visitEnd, visitFrame, visitIincInsn, visitInsnAnnotation, visitIntInsn, visitInvokeDynamicInsn, visitJumpInsn, visitLdcInsn, visitLineNumber, visitLocalVariable, visitLocalVariableAnnotation, visitLookupSwitchInsn, visitMaxs, visitMethodInsn, visitMethodInsn, visitMultiANewArrayInsn, visitParameter, visitParameterAnnotation, visitTableSwitchInsn, visitTryCatchAnnotation, visitTryCatchBlock, visitTypeAnnotation, visitTypeInsn, visitVarInsn

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

enhancer

protected ClassEnhancer enhancer

The enhancer for this class.

methodName

protected String methodName

Name for the method being adapted.

methodDescriptor

protected String methodDescriptor

Descriptor for the method being adapted.

firstLabel

boolean firstLabel

Constructor Details

EnhancerMethodAdapter

public EnhancerMethodAdapter(MethodVisitor mv,
 ClassEnhancer enhancer,
 String methodName,
 String methodDesc)

Constructor for the method adapter.

Parameters:

mv - MethodVisitor

enhancer - ClassEnhancer for the class with the method

methodName - Name of the method

methodDesc - descriptor for the method

Method Details

visitLabel

public void visitLabel(Label label)

Description copied from class: MethodVisitor

Visits a label. A label designates the instruction that will be visited just after it.

Overrides:

visitLabel in class MethodVisitor

Parameters:

label - a Label object.

visitFieldInsn

public void visitFieldInsn(int opcode,
 String owner,
 String name,
 String desc)

Method to intercept any calls to fields.

Overrides:

visitFieldInsn in class MethodVisitor

Parameters:

opcode - Operation

owner - Owner class

name - Name of the field

desc - Descriptor for the field

visitInsn

public void visitInsn(int opcode)

Method to intercept any general instructions. We use it to intercept any RETURN on a static initialisation block so we can append to it.

Overrides:

visitInsn in class MethodVisitor

Parameters:

opcode - Operation