@Override
  @Nullable
  public String getReferenceName() {
    PsiElement nameElement = getReferenceNameElement();
    if (nameElement != null) {
      IElementType nodeType = nameElement.getNode().getElementType();
      if (TokenSets.STRING_LITERAL_SET.contains(nodeType)) {
        final Object value = GrLiteralImpl.getLiteralValue(nameElement);
        if (value instanceof String) {
          return (String)value;
        }
      }

      return nameElement.getText();
    }
    return null;
  }
@Override
  @Nullable
  public String getReferenceName()