code: public static FieldAnnotation convertFieldAnnotation(ClassNameRewriter classNameRewriter, FieldAnnotation annotation) {
  
          if (classNameRewriter != IdentityClassNameRewriter.instance()) {
              annotation = new FieldAnnotation(classNameRewriter.rewriteClassName(annotation.getClassName()),
                      annotation.getFieldName(), rewriteSignature(classNameRewriter, annotation.getFieldSignature()),
                      annotation.isStatic());
          }
          return annotation;
      }
docs: Rewrite a FieldAnnotation to update the class name and field signature,
  if needed.
  
  @param classNameRewriter
  a ClassNameRewriter
  @param annotation
  a FieldAnnotation
  @return the possibly-rewritten FieldAnnotation