final DriftChangeSetSummary summary = new DriftChangeSetSummary();
ZipUtil.walkZipFile(changeSetZip, new ZipUtil.ZipEntryVisitor() {
@Override
public boolean visit(ZipEntry zipEntry, ZipInputStream stream) throws Exception {
ChangeSetReader reader = new ChangeSetReaderImpl(new BufferedReader(new InputStreamReader(stream)));
Headers headers = reader.getHeaders();
List<DriftFileDTO> missingContent = new LinkedList<DriftFileDTO>();
MongoDBChangeSet changeSet = new MongoDBChangeSet();
changeSet.setCategory(headers.getType());