final Type textType = parameters.getType(0);
final Object textValue = parameters.getValue(0);
final Type oldTextType = parameters.getType(1);
final Object oldTextValue = parameters.getValue(1);
final String text = typeRegistry.convertToText(textType, textValue);
final String oldText = typeRegistry.convertToText(oldTextType, oldTextValue);
if (oldText.length() == 0)
{
return new TypeValuePair(TextType.TYPE, text);
}