/** Marshall the given parameter object, and output to a JSONWriter */
  public void marshall(TagFilter tagFilter, JSONWriter jsonWriter) {
    if (tagFilter == null) {
      throw new AmazonClientException("Invalid argument passed to marshall(...)");
    }

    try {
      jsonWriter.object();

      if (tagFilter.getKey() != null) {
        jsonWriter.key("Key").value(tagFilter.getKey());
      }

      if (tagFilter.getValue() != null) {
        jsonWriter.key("Value").value(tagFilter.getValue());
      }

      if (tagFilter.getType() != null) {
        jsonWriter.key("Type").value(tagFilter.getType());
      }

      jsonWriter.endObject();
    } catch (Throwable t) {
      throw new AmazonClientException("Unable to marshall request to JSON: " + t.getMessage(), t);
    }
  }