/**
* Merge a local file with a Google Drive File.
*
* <p>The last modification is used to check which file to sync from. Then, the md5 checksum of
* the file is used to check whether or not the file's content should be sync'ed.
*
* @param localFileUri Local file URI to save local changes against.
* @param localFile Local file cursor to retrieve data from.
* @param driveFile Google Drive file.
*/
private void mergeFiles(Uri localFileUri, Cursor localFile, File driveFile) {
long localFileModificationDate = localFile.getLong(COLUMN_INDEX_MODIFICATION_DATE);
Log.d(
TAG,
"Modification dates: "
+ localFileModificationDate
+ " - "
+ driveFile.getModifiedDate().getValue());
if (localFileModificationDate > driveFile.getModifiedDate().getValue()) {
try {
if (localFile.getShort(COLUMN_INDEX_DELETED) != 0) {
Log.d(TAG, " > Deleting Drive file.");
mService.files().delete(driveFile.getId()).execute();
mProvider.delete(localFileUri, null, null);
} else {
String localNote = localFile.getString(COLUMN_INDEX_NOTE);
File updatedFile = null;
// Update drive file.
Log.d(TAG, " > Updating Drive file.");
driveFile.setTitle(localFile.getString(COLUMN_INDEX_TITLE));
if (md5(localNote) != driveFile.getMd5Checksum()) {
// Update both content and metadata.
ByteArrayContent content = ByteArrayContent.fromString(TEXT_PLAIN, localNote);
updatedFile = mService.files().update(driveFile.getId(), driveFile, content).execute();
} else {
// Only update the metadata.
updatedFile = mService.files().update(driveFile.getId(), driveFile).execute();
}
ContentValues values = new ContentValues();
values.put(
NotePad.Notes.COLUMN_NAME_MODIFICATION_DATE,
updatedFile.getModifiedDate().getValue());
mProvider.update(localFileUri, values, null, null);
}
} catch (IOException e) {
e.printStackTrace();
} catch (RemoteException e) {
e.printStackTrace();
}
} else if (localFileModificationDate < driveFile.getModifiedDate().getValue()) {
// Update local file.
Log.d(TAG, " > Updating local file.");
ContentValues values = new ContentValues();
values.put(NotePad.Notes.COLUMN_NAME_TITLE, driveFile.getTitle());
values.put(
NotePad.Notes.COLUMN_NAME_MODIFICATION_DATE, driveFile.getModifiedDate().getValue());
// Only download the content if it has changed.
if (md5(localFile.getString(COLUMN_INDEX_NOTE)) != driveFile.getMd5Checksum()) {
values.put(NotePad.Notes.COLUMN_NAME_NOTE, getFileContent(driveFile));
}
try {
mProvider.update(localFileUri, values, null, null);
} catch (RemoteException e) {
e.printStackTrace();
}
}
}
private void addToSnapshot(Snapshot root, ChangeRecord remoteChange) {
switch (remoteChange.getOperation()) {
case REMOTE_INSERT:
String localName = stub.storage().remoteToLocal().get(remoteChange.getRemoteFileId());
if (StringUtils.isEmpty(localName)) {
// Insert failed
return;
}
File localFile = DriveUtils.absolutePath(localName);
String parent = DriveUtils.relativePath(localFile.getParentFile());
if (root.getName().equals(parent)) {
for (Snapshot sn : root.getChildren()) {
if (sn.getName().equals(localName)) return;
}
Snapshot sn = stub.snapshot().make(localFile);
root.addChild(sn);
} else {
for (Snapshot sn : root.getChildren()) {
if (parent.startsWith(sn.getName())) {
addToSnapshot(sn, remoteChange);
return;
}
}
// TODO the operations are not in sequence.
// Didn't find?
logger.warn(
MessageFormat.format("Remote insert cannot find local parent {0}", remoteChange));
// throw new IllegalArgumentException();
}
break;
case REMOTE_CHANGE:
{
String fileName = remoteChange.getLocalFile();
if (fileName.equals(root.getName())) {
com.google.api.services.drive.model.File remoteFile = remoteChange.getContext(0);
root.setMd5Checksum(remoteFile.getMd5Checksum());
} else {
for (Snapshot sn : root.getChildren()) {
if (fileName.startsWith(sn.getName())) {
addToSnapshot(sn, remoteChange);
return;
}
}
// Didn't find?
logger.error(
MessageFormat.format(
"Local root doesn't contain this file {0}. Should be an error.", remoteChange));
// throw new IllegalArgumentException();
}
break;
}
case REMOTE_RENAME:
{
String fileName = remoteChange.getLocalFile();
if (root.getName().startsWith(fileName)) {
String newName = remoteChange.getContext(1);
root.setName(root.getName().replaceFirst(fileName, newName));
for (Snapshot sn : root.getChildren()) {
addToSnapshot(sn, remoteChange);
}
} else {
for (Snapshot sn : root.getChildren()) {
if (fileName.startsWith(sn.getName())) {
addToSnapshot(sn, remoteChange);
return;
}
}
// Didn't find?
logger.error(
MessageFormat.format(
"Remote rename cannot find local corresponding {0}, should be an error",
remoteChange));
// throw new IllegalArgumentException();
}
break;
}
case REMOTE_DELETE:
String fileName = remoteChange.getLocalFile();
if (StringUtils.isEmpty(fileName)) {
return;
}
for (int i = 0; i < root.getChildren().size(); i++) {
Snapshot sn = root.getChildren().get(i);
if (fileName.equals(sn.getName())) {
root.getChildren().remove(sn);
return;
}
if (fileName.startsWith(sn.getName())) {
addToSnapshot(sn, remoteChange);
return;
}
}
// Didn't find?
logger.warn(
MessageFormat.format(
"Remote change cannot find local corresponding {0}, possibly caused by deleting of parent folder",
remoteChange));
// This means the remote change is out of date
break;
default:
throw new IllegalArgumentException();
}
}