@Override
@SuppressWarnings("deprecation")
protected void onDocumentRead() throws IOException {
try {
PresentationDocument doc =
PresentationDocument.Factory.parse(getCorePart().getInputStream());
_presentation = doc.getPresentation();
Map<String, XSLFSlide> shIdMap = new HashMap<String, XSLFSlide>();
_masters = new HashMap<String, XSLFSlideMaster>();
for (POIXMLDocumentPart p : getRelations()) {
if (p instanceof XSLFSlide) {