public FieldTransformer() 
{
	  
		this(null);
}

 public FieldTransformer(FieldFilter f) 
{
		filter = f;
}

 public  void setFieldFilter(FieldFilter f) 
{
		filter = f;
}

 public  void transform(File file) throws Exception 
{
		DataInputStream in = new DataInputStream(new FileInputStream(file));
		ClassFile classfile = new ClassFile(in);
		transform(classfile);
		DataOutputStream out = new DataOutputStream(new FileOutputStream(file));
		try {
			classfile.write(out);
		} finally {
			out.close();
		}
}

 public  void transform(ClassFile classfile) throws Exception 
{
		if (classfile.isInterface()) {
			return;
		}
		try {
			addFieldHandlerField(classfile);
			addGetFieldHandlerMethod(classfile);
			addSetFieldHandlerMethod(classfile);
			addFieldHandledInterface(classfile);
			addReadWriteMethods(classfile);
			transformInvokevirtualsIntoPutAndGetfields(classfile);
		} catch (CannotCompileException e) {
			throw new RuntimeException(e.getMessage(), e);
		}
}