Package de.uzl.its.swat.instrument.instruction

Class InstructionTransformer

java.lang.Object

de.uzl.its.swat.instrument.instruction.InstructionTransformer

All Implemented Interfaces:

ClassFileTransformer

public class InstructionTransformer
extends Object
implements ClassFileTransformer

An agent provides an implementation of this interface in order to transform class files. The transformation occurs before the class is defined by the JVM.

Constructor Summary

Constructors

Constructor	Description
InstructionTransformer()

Method Summary

Modifier and Type	Method	Description
static PrintBox	getPrintBox()
byte[]	transform(ClassLoader loader, String cname, Class<?> classBeingRedefined, ProtectionDomain d, byte[] cbuf)	The implementation of this method may transform the supplied class file and return a new replacement class file.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.instrument.ClassFileTransformer

transform

Constructor Details

InstructionTransformer

public InstructionTransformer()

Method Details

transform

public byte[] transform(ClassLoader loader,
 String cname,
 Class<?> classBeingRedefined,
 ProtectionDomain d,
 byte[] cbuf)

The implementation of this method may transform the supplied class file and return a new replacement class file. Addition: Adds the InstructionClassAdapter for modifying the classFile

Specified by:

transform in interface ClassFileTransformer

Parameters:

loader - the defining loader of the class to be transformed, may be null if the bootstrap loader

cname - the name of the class in the internal form of fully qualified class and interface names as defined in The Java Virtual Machine Specification. For example, "java/util/List".

classBeingRedefined - if this is triggered by a redefine or retransform, the class being redefined or retransformed; if this is a class load, null

d - the protection domain of the class being defined or redefined

cbuf - the input byte buffer in class file format - must not be modified

Returns:

a well-formed class file buffer (the result of the transform), or null if no transform is performed.

getPrintBox

public static PrintBox getPrintBox()