if (_content != null) {
size = _content.size();
}
_modified = false;
_data = bytes;
_content = new MultiPartContent(contentType, bytes);
if (size>0) {
_partsList.fireIntervalRemoved(0, size-1);
}
if (_content.size()>0) {
_partsList.fireIntervalAdded(0, _content.size()-1);