Class DataNucleusClassFileTransformer

  extended by org.datanucleus.enhancer.DataNucleusClassFileTransformer
All Implemented Interfaces:

public class DataNucleusClassFileTransformer
extends java.lang.Object
implements java.lang.instrument.ClassFileTransformer

Entry Point (as per Java) for transforming classes at runtime. Before loading classes, the JVM invokes the ClassFileTranformer to transform the class. Will never process classes in packages "java.", "javax.", "org.datanucleus." (when not "test" or "samples").

Field Summary
protected  java.lang.String arguments
          User input package name(s) (comma-separated) that should be processed.
protected  RuntimeEnhancer enhancer
Constructor Summary
DataNucleusClassFileTransformer(java.lang.String arguments)
Method Summary
static void premain(java.lang.String agentArguments, java.lang.instrument.Instrumentation instrumentation)
 byte[] transform(java.lang.ClassLoader loader, java.lang.String className, java.lang.Class classBeingRedefined, protectionDomain, byte[] classfileBuffer)
          Invoked when a class is being loaded or redefined.
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail


protected RuntimeEnhancer enhancer


protected java.lang.String arguments
User input package name(s) (comma-separated) that should be processed.

Constructor Detail


public DataNucleusClassFileTransformer()


public DataNucleusClassFileTransformer(java.lang.String arguments)
Method Detail


public static void premain(java.lang.String agentArguments,
                           java.lang.instrument.Instrumentation instrumentation)


public byte[] transform(java.lang.ClassLoader loader,
                        java.lang.String className,
                        java.lang.Class classBeingRedefined,
                        byte[] classfileBuffer)
                 throws java.lang.instrument.IllegalClassFormatException
Invoked when a class is being loaded or redefined. The implementation of this method may transform the supplied class file and return a new replacement class file.

Specified by:
transform in interface java.lang.instrument.ClassFileTransformer
loader - The defining loader of the class to be transformed, may be null if the bootstrap loader
className - The name of the class in the internal form of fully qualified class and interface names
classBeingRedefined - If this is a redefine, the class being redefined, otherwise null
protectionDomain - The protection domain of the class being defined or redefined
classfileBuffer - The input byte buffer in class file format - must not be modified
A well-formed class file buffer (the result of the transform), or null if no transform is performed
java.lang.instrument.IllegalClassFormatException - If the input does not represent a well-formed class file

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