protected long changes(List<Change> changes) throws IOException {
com.google.api.services.drive.Drive.Changes.List request = drive.changes().list();
request.setMaxResults(100);
long lastChange = -1;
Object lastChangeData = stub.storage().get(StorageService.REMOTE_CHANGE);
if (lastChangeData != null) {
if (lastChangeData instanceof Double) {
lastChange = ((Double) lastChangeData).longValue();
request.setStartChangeId(lastChange + 1);
} else if (lastChangeData instanceof Long) {
lastChange = (Long) lastChangeData;
request.setStartChangeId(lastChange + 1);
} else {
throw new IllegalArgumentException(lastChangeData.getClass().getName());
}
}
while (true) {
ChangeList response = execute(request);
if (changes != null) {
changes.addAll(response.getItems());
}
if (StringUtils.isEmpty(response.getNextPageToken())) {
List<Change> items = response.getItems();
if (!items.isEmpty()) lastChange = items.get(items.size() - 1).getId();
break;
} else {
request.setPageToken(response.getNextPageToken());
}
}
return lastChange;
}
/**
* Retrieve a collection of files that have changed since the provided {@code changeId}.
*
* @param changeId Change ID to retrieve changed files from.
* @return Map of changed files key'ed by their file ID.
*/
private Map<String, File> getChangedFiles(long changeId) {
Map<String, File> result = new HashMap<String, File>();
try {
Changes.List request = mService.changes().list().setStartChangeId(changeId);
do {
ChangeList changes = request.execute();
long largestChangeId = changes.getLargestChangeId().longValue();
for (Change change : changes.getItems()) {
if (change.getDeleted()) {
result.put(change.getFileId(), null);
} else if (TEXT_PLAIN.equals(change.getFile().getMimeType())) {
result.put(change.getFileId(), change.getFile());
}
}
if (largestChangeId > mLargestChangeId) {
mLargestChangeId = largestChangeId;
}
request.setPageToken(changes.getNextPageToken());
} while (request.getPageToken() != null && request.getPageToken().length() > 0);
} catch (IOException e) {
e.printStackTrace();
}
Log.d(TAG, "Got changed Drive files: " + result.size() + " - " + mLargestChangeId);
return result;
}