/**
* 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;
}
/**
* Returns a list of changes to a file
*
* @param service Drive API service instance.
* @param params HashMap containing parameters for the request
* @return <strong>List</strong> of changes
*/
private ChangeList getChangeList(Drive service, HashMap<String, String> params)
throws IOException {
Changes.List request = service.changes().list();
String temporaryResult = params.get(GoogleDriveUtils.StringConstants.INCLUDE_DELETED);
if (!EMPTY_STRING.equals(temporaryResult)) {
request.setIncludeDeleted(Boolean.valueOf(temporaryResult));
}
temporaryResult = EMPTY_STRING;
temporaryResult = params.get(GoogleDriveUtils.StringConstants.INCLUDE_SUBSCRIBED);
if (!EMPTY_STRING.equals(temporaryResult)) {
request.setIncludeSubscribed(Boolean.valueOf(temporaryResult));
}
temporaryResult = EMPTY_STRING;
temporaryResult = params.get(GoogleDriveUtils.StringConstants.MAX_RESULTS);
if (!EMPTY_STRING.equals(temporaryResult)) {
request.setMaxResults(Integer.valueOf(temporaryResult));
}
temporaryResult = EMPTY_STRING;
temporaryResult = params.get(GoogleDriveUtils.StringConstants.PAGE_TOKEN);
if (!EMPTY_STRING.equals(temporaryResult)) {
request.setPageToken(temporaryResult);
}
temporaryResult = EMPTY_STRING;
temporaryResult = params.get(GoogleDriveUtils.StringConstants.START_CHANGE_ID);
if (!EMPTY_STRING.equals(temporaryResult)) {
request.setStartChangeId(Long.valueOf(temporaryResult));
}
return request.execute();
}