Java in a Nutshell, 5th Edition [Electronic resources] نسخه متنی

A
ClassFileTransformer
registered through an
Instrumentation object is offered a chance to
transform every class that is subsequently loaded or redefined. The
final argument to transform( ) is a byte array
that contains the raw bytes of the class file (or bytes returned by a
previously invoked ClassFileTransformer). If the
TRansform( )
method wishes to transform the class, it should return the
transformed bytes in a newly allocated array. The array passed to
transform( ) should not be modified. If the
transform( ) method does not wish to transform a
given class, it should return null.

public interface

ClassFileTransformer {
// Public Instance Methods
byte[ ]

transform (ClassLoader

loader , String

className , Class<?>

classBeingRedefined ,
java.security.ProtectionDomain

protectionDomain , byte[ ]

classfileBuffer )
throws IllegalClassFormatException;
}

Passed To

Instrumentation.{addTransformer( ),
removeTransformer( )}