Class DataNucleusClassFileTransformer

  • All Implemented Interfaces:

    public class DataNucleusClassFileTransformer
    extends Object
    implements 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"). Accepts the following (optional) arguments
    • api : JDO, JPA, Jakarta - default=JDO
    • generatePK : true, false - default=true
    • generateConstructor : true, false - default=true
    • detachListener : true, false - default=false
    • default args : package names of classes to be enhanced when encountered
    • Constructor Detail

      • DataNucleusClassFileTransformer

        public DataNucleusClassFileTransformer​(String arguments,
                                               Map contextProps)
    • Method Detail

      • transform

        public byte[] transform​(ClassLoader loader,
                                String className,
                                Class classBeingRedefined,
                                ProtectionDomain protectionDomain,
                                byte[] classfileBuffer)
                         throws 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 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
        IllegalClassFormatException - If the input does not represent a well-formed class file