src/com/owncloud/android/files/services/FileDownloader.java

   1 /* ownCloud Android client application
   2  *   Copyright (C) 2012 Bartek Przybylski
   3  *   Copyright (C) 2012-2013 ownCloud Inc.
   4  *
   5  *   This program is free software: you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License version 2,
   7  *   as published by the Free Software Foundation.
   8  *
   9  *   This program is distributed in the hope that it will be useful,
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *   GNU General Public License for more details.
  13  *
  14  *   You should have received a copy of the GNU General Public License
  15  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  *
  17  */
  18
  19 package com.owncloud.android.files.services;
  20
  21 import java.io.File;
  22 import java.io.IOException;
  23 import java.util.AbstractList;
  24 import java.util.ArrayList;
  25 import java.util.HashMap;
  26 import java.util.Iterator;
  27 import java.util.Map;
  28 import java.util.Vector;
  29 import java.util.concurrent.ConcurrentHashMap;
  30 import java.util.concurrent.ConcurrentMap;
  31
  32 import com.owncloud.android.R;
  33 import com.owncloud.android.authentication.AuthenticatorActivity;
  34 import com.owncloud.android.datamodel.FileDataStorageManager;
  35 import com.owncloud.android.datamodel.OCFile;
  36
  37 import com.owncloud.android.lib.common.network.OnDatatransferProgressListener;
  38 import com.owncloud.android.lib.common.OwnCloudAccount;
  39 import com.owncloud.android.lib.common.OwnCloudClient;
  40 import com.owncloud.android.lib.common.OwnCloudClientManagerFactory;
  41 import com.owncloud.android.notifications.NotificationBuilderWithProgressBar;
  42 import com.owncloud.android.notifications.NotificationDelayer;
  43 import com.owncloud.android.lib.common.operations.RemoteOperationResult;
  44 import com.owncloud.android.lib.common.operations.RemoteOperationResult.ResultCode;
  45 import com.owncloud.android.lib.common.utils.Log_OC;
  46 import com.owncloud.android.lib.resources.files.FileUtils;
  47 import com.owncloud.android.operations.DownloadFileOperation;
  48 import com.owncloud.android.ui.activity.FileActivity;
  49 import com.owncloud.android.ui.activity.FileDisplayActivity;
  50 import com.owncloud.android.ui.preview.PreviewImageActivity;
  51 import com.owncloud.android.ui.preview.PreviewImageFragment;
  52 import com.owncloud.android.utils.ErrorMessageAdapter;
  53
  54 import android.accounts.Account;
  55 import android.accounts.AccountsException;
  56 import android.app.NotificationManager;
  57 import android.app.PendingIntent;
  58 import android.app.Service;
  59 import android.content.Intent;
  60 import android.os.Binder;
  61 import android.os.Handler;
  62 import android.os.HandlerThread;
  63 import android.os.IBinder;
  64 import android.os.Looper;
  65 import android.os.Message;
  66 import android.os.Process;
  67 import android.support.v4.app.NotificationCompat;
  68
  69 public class FileDownloader extends Service implements OnDatatransferProgressListener {
  70
  71     public static final String EXTRA_ACCOUNT = "ACCOUNT";
  72     public static final String EXTRA_FILE = "FILE";
  73
  74     public static final String ACTION_CANCEL_FILE_DOWNLOAD = "CANCEL_FILE_DOWNLOAD";
  75
  76     private static final String DOWNLOAD_ADDED_MESSAGE = "DOWNLOAD_ADDED";
  77     private static final String DOWNLOAD_FINISH_MESSAGE = "DOWNLOAD_FINISH";
  78     public static final String EXTRA_DOWNLOAD_RESULT = "RESULT";
  79     public static final String EXTRA_FILE_PATH = "FILE_PATH";
  80     public static final String EXTRA_REMOTE_PATH = "REMOTE_PATH";
  81     public static final String ACCOUNT_NAME = "ACCOUNT_NAME";
  82
  83     private static final String TAG = "FileDownloader";
  84
  85     private Looper mServiceLooper;
  86     private ServiceHandler mServiceHandler;
  87     private IBinder mBinder;
  88     private OwnCloudClient mDownloadClient = null;
  89     private Account mLastAccount = null;
  90     private FileDataStorageManager mStorageManager;
  91
  92     private ConcurrentMap<String, DownloadFileOperation> mPendingDownloads = new ConcurrentHashMap<String, DownloadFileOperation>();
  93     private DownloadFileOperation mCurrentDownload = null;
  94
  95     private NotificationManager mNotificationManager;
  96     private NotificationCompat.Builder mNotificationBuilder;
  97     private int mLastPercent;
  98
  99
 100     public static String getDownloadAddedMessage() {
 101         return FileDownloader.class.getName().toString() + DOWNLOAD_ADDED_MESSAGE;
 102     }
 103
 104     public static String getDownloadFinishMessage() {
 105         return FileDownloader.class.getName().toString() + DOWNLOAD_FINISH_MESSAGE;
 106     }
 107
 108     /**
 109      * Builds a key for mPendingDownloads from the account and file to download
 110      *
 111      * @param account   Account where the file to download is stored
 112      * @param file      File to download
 113      */
 114     private String buildRemoteName(Account account, OCFile file) {
 115         return account.name + file.getRemotePath();
 116     }
 117
 118
 119     /**
 120      * Service initialization
 121      */
 122     @Override
 123     public void onCreate() {
 124         super.onCreate();
 125         mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
 126         HandlerThread thread = new HandlerThread("FileDownloaderThread",
 127                 Process.THREAD_PRIORITY_BACKGROUND);
 128         thread.start();
 129         mServiceLooper = thread.getLooper();
 130         mServiceHandler = new ServiceHandler(mServiceLooper, this);
 131         mBinder = new FileDownloaderBinder();
 132     }
 133
 134     /**
 135      * Entry point to add one or several files to the queue of downloads.
 136      *
 137      * New downloads are added calling to startService(), resulting in a call to this method. This ensures the service will keep on working
 138      * although the caller activity goes away.
 139      */
 140     @Override
 141     public int onStartCommand(Intent intent, int flags, int startId) {
 142         if (    !intent.hasExtra(EXTRA_ACCOUNT) ||
 143                 !intent.hasExtra(EXTRA_FILE)
 144                 /*!intent.hasExtra(EXTRA_FILE_PATH) ||
 145                 !intent.hasExtra(EXTRA_REMOTE_PATH)*/
 146            ) {
 147             Log_OC.e(TAG, "Not enough information provided in intent");
 148             return START_NOT_STICKY;
 149         } else {
 150             Account account = intent.getParcelableExtra(EXTRA_ACCOUNT);
 151             OCFile file = intent.getParcelableExtra(EXTRA_FILE);
 152
 153             if (ACTION_CANCEL_FILE_DOWNLOAD.equals(intent.getAction())) {
 154
 155                 // Cancel the download
 156                 cancel(account,file);
 157
 158             } else {
 159
 160                 AbstractList<String> requestedDownloads = new Vector<String>(); // dvelasco: now this always contains just one element, but that can change in a near future (download of multiple selection)
 161                 String downloadKey = buildRemoteName(account, file);
 162                 try {
 163                     DownloadFileOperation newDownload = new DownloadFileOperation(account, file);
 164                     mPendingDownloads.putIfAbsent(downloadKey, newDownload);
 165                     newDownload.addDatatransferProgressListener(this);
 166                     newDownload.addDatatransferProgressListener((FileDownloaderBinder) mBinder);
 167                     requestedDownloads.add(downloadKey);
 168                     sendBroadcastNewDownload(newDownload);
 169
 170                 } catch (IllegalArgumentException e) {
 171                     Log_OC.e(TAG, "Not enough information provided in intent: " + e.getMessage());
 172                     return START_NOT_STICKY;
 173                 }
 174
 175                 if (requestedDownloads.size() > 0) {
 176                     Message msg = mServiceHandler.obtainMessage();
 177                     msg.arg1 = startId;
 178                     msg.obj = requestedDownloads;
 179                     mServiceHandler.sendMessage(msg);
 180                 }
 181             }
 182         }
 183
 184         return START_NOT_STICKY;
 185     }
 186
 187
 188     /**
 189      * Provides a binder object that clients can use to perform operations on the queue of downloads, excepting the addition of new files.
 190      *
 191      * Implemented to perform cancellation, pause and resume of existing downloads.
 192      */
 193     @Override
 194     public IBinder onBind(Intent arg0) {
 195         return mBinder;
 196     }
 197
 198
 199     /**
 200      * Called when ALL the bound clients were onbound.
 201      */
 202     @Override
 203     public boolean onUnbind(Intent intent) {
 204         ((FileDownloaderBinder)mBinder).clearListeners();
 205         return false;   // not accepting rebinding (default behaviour)
 206     }
 207
 208
 209     /**
 210      *  Binder to let client components to perform operations on the queue of downloads.
 211      *
 212      *  It provides by itself the available operations.
 213      */
 214     public class FileDownloaderBinder extends Binder implements OnDatatransferProgressListener {
 215
 216         /**
 217          * Map of listeners that will be reported about progress of downloads from a {@link FileDownloaderBinder} instance
 218          */
 219         private Map<String, OnDatatransferProgressListener> mBoundListeners = new HashMap<String, OnDatatransferProgressListener>();
 220
 221
 222         /**
 223          * Cancels a pending or current download of a remote file.
 224          *
 225          * @param account       Owncloud account where the remote file is stored.
 226          * @param file          A file in the queue of pending downloads
 227          */
 228         public void cancel(Account account, OCFile file) {
 229             DownloadFileOperation download = null;
 230             synchronized (mPendingDownloads) {
 231                 download = mPendingDownloads.remove(buildRemoteName(account, file));
 232             }
 233             if (download != null) {
 234                 download.cancel();
 235             }
 236         }
 237
 238
 239         public void clearListeners() {
 240             mBoundListeners.clear();
 241         }
 242
 243
 244         /**
 245          * Returns True when the file described by 'file' in the ownCloud account 'account' is downloading or waiting to download.
 246          *
 247          * If 'file' is a directory, returns 'true' if some of its descendant files is downloading or waiting to download.
 248          *
 249          * @param account       Owncloud account where the remote file is stored.
 250          * @param file          A file that could be in the queue of downloads.
 251          */
 252         public boolean isDownloading(Account account, OCFile file) {
 253             if (account == null || file == null) return false;
 254             String targetKey = buildRemoteName(account, file);
 255             synchronized (mPendingDownloads) {
 256                 if (file.isFolder()) {
 257                     // this can be slow if there are many downloads :(
 258                     Iterator<String> it = mPendingDownloads.keySet().iterator();
 259                     boolean found = false;
 260                     while (it.hasNext() && !found) {
 261                         found = it.next().startsWith(targetKey);
 262                     }
 263                     return found;
 264                 } else {
 265                     return (mPendingDownloads.containsKey(targetKey));
 266                 }
 267             }
 268         }
 269
 270
 271         /**
 272          * Adds a listener interested in the progress of the download for a concrete file.
 273          *
 274          * @param listener      Object to notify about progress of transfer.
 275          * @param account       ownCloud account holding the file of interest.
 276          * @param file          {@link OCfile} of interest for listener.
 277          */
 278         public void addDatatransferProgressListener (OnDatatransferProgressListener listener, Account account, OCFile file) {
 279             if (account == null || file == null || listener == null) return;
 280             String targetKey = buildRemoteName(account, file);
 281             mBoundListeners.put(targetKey, listener);
 282         }
 283
 284
 285         /**
 286          * Removes a listener interested in the progress of the download for a concrete file.
 287          *
 288          * @param listener      Object to notify about progress of transfer.
 289          * @param account       ownCloud account holding the file of interest.
 290          * @param file          {@link OCfile} of interest for listener.
 291          */
 292         public void removeDatatransferProgressListener (OnDatatransferProgressListener listener, Account account, OCFile file) {
 293             if (account == null || file == null || listener == null) return;
 294             String targetKey = buildRemoteName(account, file);
 295             if (mBoundListeners.get(targetKey) == listener) {
 296                 mBoundListeners.remove(targetKey);
 297             }
 298         }
 299
 300         @Override
 301         public void onTransferProgress(long progressRate, long totalTransferredSoFar, long totalToTransfer,
 302                 String fileName) {
 303             String key = buildRemoteName(mCurrentDownload.getAccount(), mCurrentDownload.getFile());
 304             OnDatatransferProgressListener boundListener = mBoundListeners.get(key);
 305             if (boundListener != null) {
 306                 boundListener.onTransferProgress(progressRate, totalTransferredSoFar, totalToTransfer, fileName);
 307             }
 308         }
 309
 310     }
 311
 312
 313     /**
 314      * Download worker. Performs the pending downloads in the order they were requested.
 315      *
 316      * Created with the Looper of a new thread, started in {@link FileUploader#onCreate()}.
 317      */
 318     private static class ServiceHandler extends Handler {
 319         // don't make it a final class, and don't remove the static ; lint will warn about a possible memory leak
 320         FileDownloader mService;
 321         public ServiceHandler(Looper looper, FileDownloader service) {
 322             super(looper);
 323             if (service == null)
 324                 throw new IllegalArgumentException("Received invalid NULL in parameter 'service'");
 325             mService = service;
 326         }
 327
 328         @Override
 329         public void handleMessage(Message msg) {
 330             @SuppressWarnings("unchecked")
 331             AbstractList<String> requestedDownloads = (AbstractList<String>) msg.obj;
 332             if (msg.obj != null) {
 333                 Iterator<String> it = requestedDownloads.iterator();
 334                 while (it.hasNext()) {
 335                     mService.downloadFile(it.next());
 336                 }
 337             }
 338             mService.stopSelf(msg.arg1);
 339         }
 340     }
 341
 342
 343     /**
 344      * Core download method: requests a file to download and stores it.
 345      *
 346      * @param downloadKey   Key to access the download to perform, contained in mPendingDownloads
 347      */
 348     private void downloadFile(String downloadKey) {
 349
 350         synchronized(mPendingDownloads) {
 351             mCurrentDownload = mPendingDownloads.get(downloadKey);
 352         }
 353
 354         if (mCurrentDownload != null) {
 355
 356             notifyDownloadStart(mCurrentDownload);
 357
 358             RemoteOperationResult downloadResult = null;
 359             try {
 360                 /// prepare client object to send the request to the ownCloud server
 361                 if (mDownloadClient == null || !mLastAccount.equals(mCurrentDownload.getAccount())) {
 362                     mLastAccount = mCurrentDownload.getAccount();
 363                     mStorageManager =
 364                             new FileDataStorageManager(mLastAccount, getContentResolver());
 365                     OwnCloudAccount ocAccount = new OwnCloudAccount(mLastAccount, this);
 366                     mDownloadClient = OwnCloudClientManagerFactory.getDefaultSingleton().
 367                             getClientFor(ocAccount, this);
 368                 }
 369
 370                 /// perform the download
 371                 downloadResult = mCurrentDownload.execute(mDownloadClient);
 372                 if (downloadResult.isSuccess()) {
 373                     saveDownloadedFile();
 374                 }
 375
 376             } catch (AccountsException e) {
 377                 Log_OC.e(TAG, "Error while trying to get autorization for " + mLastAccount.name, e);
 378                 downloadResult = new RemoteOperationResult(e);
 379             } catch (IOException e) {
 380                 Log_OC.e(TAG, "Error while trying to get autorization for " + mLastAccount.name, e);
 381                 downloadResult = new RemoteOperationResult(e);
 382
 383             } finally {
 384                 synchronized(mPendingDownloads) {
 385                     mPendingDownloads.remove(downloadKey);
 386                 }
 387             }
 388
 389
 390             /// notify result
 391             notifyDownloadResult(mCurrentDownload, downloadResult);
 392
 393             sendBroadcastDownloadFinished(mCurrentDownload, downloadResult);
 394         }
 395     }
 396
 397
 398     /**
 399      * Updates the OC File after a successful download.
 400      */
 401     private void saveDownloadedFile() {
 402         OCFile file = mStorageManager.getFileById(mCurrentDownload.getFile().getFileId());
 403         long syncDate = System.currentTimeMillis();
 404         file.setLastSyncDateForProperties(syncDate);
 405         file.setLastSyncDateForData(syncDate);
 406         file.setNeedsUpdateThumbnail(true);
 407         file.setModificationTimestamp(mCurrentDownload.getModificationTimestamp());
 408         file.setModificationTimestampAtLastSyncForData(mCurrentDownload.getModificationTimestamp());
 409         // file.setEtag(mCurrentDownload.getEtag());    // TODO Etag, where available
 410         file.setMimetype(mCurrentDownload.getMimeType());
 411         file.setStoragePath(mCurrentDownload.getSavePath());
 412         file.setFileLength((new File(mCurrentDownload.getSavePath()).length()));
 413         file.setRemoteId(mCurrentDownload.getFile().getRemoteId());
 414         mStorageManager.saveFile(file);
 415         mStorageManager.triggerMediaScan(file.getStoragePath());
 416     }
 417
 418
 419     /**
 420      * Creates a status notification to show the download progress
 421      *
 422      * @param download  Download operation starting.
 423      */
 424     private void notifyDownloadStart(DownloadFileOperation download) {
 425         /// create status notification with a progress bar
 426         mLastPercent = 0;
 427         mNotificationBuilder =
 428                 NotificationBuilderWithProgressBar.newNotificationBuilderWithProgressBar(this);
 429         mNotificationBuilder
 430                 .setSmallIcon(R.drawable.notification_icon)
 431                 .setTicker(getString(R.string.downloader_download_in_progress_ticker))
 432                 .setContentTitle(getString(R.string.downloader_download_in_progress_ticker))
 433                 .setOngoing(true)
 434                 .setProgress(100, 0, download.getSize() < 0)
 435                 .setContentText(
 436                         String.format(getString(R.string.downloader_download_in_progress_content), 0,
 437                                 new File(download.getSavePath()).getName())
 438                 );
 439
 440         /// includes a pending intent in the notification showing the details view of the file
 441         Intent showDetailsIntent = null;
 442         if (PreviewImageFragment.canBePreviewed(download.getFile())) {
 443             showDetailsIntent = new Intent(this, PreviewImageActivity.class);
 444         } else {
 445             showDetailsIntent = new Intent(this, FileDisplayActivity.class);
 446         }
 447         showDetailsIntent.putExtra(FileActivity.EXTRA_FILE, download.getFile());
 448         showDetailsIntent.putExtra(FileActivity.EXTRA_ACCOUNT, download.getAccount());
 449         showDetailsIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
 450
 451         mNotificationBuilder.setContentIntent(PendingIntent.getActivity(
 452             this, (int) System.currentTimeMillis(), showDetailsIntent, 0
 453         ));
 454
 455         mNotificationManager.notify(R.string.downloader_download_in_progress_ticker, mNotificationBuilder.build());
 456     }
 457
 458
 459     /**
 460      * Callback method to update the progress bar in the status notification.
 461      */
 462     @Override
 463     public void onTransferProgress(long progressRate, long totalTransferredSoFar, long totalToTransfer, String filePath) {
 464         int percent = (int)(100.0*((double)totalTransferredSoFar)/((double)totalToTransfer));
 465         if (percent != mLastPercent) {
 466             mNotificationBuilder.setProgress(100, percent, totalToTransfer < 0);
 467             String fileName = filePath.substring(filePath.lastIndexOf(FileUtils.PATH_SEPARATOR) + 1);
 468             String text = String.format(getString(R.string.downloader_download_in_progress_content), percent, fileName);
 469             mNotificationBuilder.setContentText(text);
 470             mNotificationManager.notify(R.string.downloader_download_in_progress_ticker, mNotificationBuilder.build());
 471         }
 472         mLastPercent = percent;
 473     }
 474
 475
 476     /**
 477      * Updates the status notification with the result of a download operation.
 478      *
 479      * @param downloadResult    Result of the download operation.
 480      * @param download          Finished download operation
 481      */
 482     private void notifyDownloadResult(DownloadFileOperation download, RemoteOperationResult downloadResult) {
 483         mNotificationManager.cancel(R.string.downloader_download_in_progress_ticker);
 484         if (!downloadResult.isCancelled()) {
 485             int tickerId = (downloadResult.isSuccess()) ? R.string.downloader_download_succeeded_ticker :
 486                 R.string.downloader_download_failed_ticker;
 487
 488             boolean needsToUpdateCredentials = (
 489                     downloadResult.getCode() == ResultCode.UNAUTHORIZED ||
 490                     downloadResult.isIdPRedirection()
 491             );
 492             tickerId = (needsToUpdateCredentials) ?
 493                     R.string.downloader_download_failed_credentials_error : tickerId;
 494
 495             mNotificationBuilder
 496             .setTicker(getString(tickerId))
 497             .setContentTitle(getString(tickerId))
 498             .setAutoCancel(true)
 499             .setOngoing(false)
 500             .setProgress(0, 0, false);
 501
 502             if (needsToUpdateCredentials) {
 503
 504                 // let the user update credentials with one click
 505                 Intent updateAccountCredentials = new Intent(this, AuthenticatorActivity.class);
 506                 updateAccountCredentials.putExtra(AuthenticatorActivity.EXTRA_ACCOUNT, download.getAccount());
 507                 updateAccountCredentials.putExtra(AuthenticatorActivity.EXTRA_ACTION, AuthenticatorActivity.ACTION_UPDATE_EXPIRED_TOKEN);
 508                 updateAccountCredentials.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
 509                 updateAccountCredentials.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
 510                 updateAccountCredentials.addFlags(Intent.FLAG_FROM_BACKGROUND);
 511                 mNotificationBuilder
 512                     .setContentIntent(PendingIntent.getActivity(
 513                         this, (int) System.currentTimeMillis(), updateAccountCredentials, PendingIntent.FLAG_ONE_SHOT));
 514
 515                 mDownloadClient = null;   // grant that future retries on the same account will get the fresh credentials
 516
 517             } else {
 518                 // TODO put something smart in showDetailsIntent
 519                 Intent   showDetailsIntent = new Intent();
 520                 mNotificationBuilder
 521                     .setContentIntent(PendingIntent.getActivity(
 522                         this, (int) System.currentTimeMillis(), showDetailsIntent, 0));
 523             }
 524
 525             mNotificationBuilder.setContentText(ErrorMessageAdapter.getErrorCauseMessage(downloadResult, download, getResources()));
 526             mNotificationManager.notify(tickerId, mNotificationBuilder.build());
 527
 528             // Remove success notification
 529             if (downloadResult.isSuccess()) {
 530                 // Sleep 2 seconds, so show the notification before remove it
 531                 NotificationDelayer.cancelWithDelay(
 532                         mNotificationManager,
 533                         R.string.downloader_download_succeeded_ticker,
 534                         2000);
 535             }
 536
 537         }
 538     }
 539
 540
 541     /**
 542      * Sends a broadcast when a download finishes in order to the interested activities can update their view
 543      *
 544      * @param download          Finished download operation
 545      * @param downloadResult    Result of the download operation
 546      */
 547     private void sendBroadcastDownloadFinished(DownloadFileOperation download, RemoteOperationResult downloadResult) {
 548         Intent end = new Intent(getDownloadFinishMessage());
 549         end.putExtra(EXTRA_DOWNLOAD_RESULT, downloadResult.isSuccess());
 550         end.putExtra(ACCOUNT_NAME, download.getAccount().name);
 551         end.putExtra(EXTRA_REMOTE_PATH, download.getRemotePath());
 552         end.putExtra(EXTRA_FILE_PATH, download.getSavePath());
 553         sendStickyBroadcast(end);
 554     }
 555
 556
 557     /**
 558      * Sends a broadcast when a new download is added to the queue.
 559      *
 560      * @param download          Added download operation
 561      */
 562     private void sendBroadcastNewDownload(DownloadFileOperation download) {
 563         Intent added = new Intent(getDownloadAddedMessage());
 564         added.putExtra(ACCOUNT_NAME, download.getAccount().name);
 565         added.putExtra(EXTRA_REMOTE_PATH, download.getRemotePath());
 566         added.putExtra(EXTRA_FILE_PATH, download.getSavePath());
 567         sendStickyBroadcast(added);
 568     }
 569
 570     /**
 571      * Cancel operation
 572      * @param account       Owncloud account where the remote file is stored.
 573      * @param file          File OCFile
 574      */
 575     public void cancel(Account account, OCFile file){
 576         if(Looper.myLooper() == Looper.getMainLooper()) {
 577             Log_OC.d(TAG, "Current Thread is Main Thread.");
 578         } else {
 579             Log_OC.d(TAG, "Current Thread is NOT Main Thread.");
 580         }
 581
 582         DownloadFileOperation download = null;
 583         String targetKey = buildRemoteName(account, file);
 584         ArrayList<String> keyItems = new ArrayList<String>();
 585         synchronized (mPendingDownloads) {
 586             if (file.isFolder()) {
 587                 Log_OC.d(TAG, "Folder download. Canceling pending downloads (from folder)");
 588                 Iterator<String> it = mPendingDownloads.keySet().iterator();
 589                 boolean found = false;
 590                 while (it.hasNext()) {
 591                     String keyDownloadOperation = it.next();
 592                     found = keyDownloadOperation.startsWith(targetKey);
 593                     if (found) {
 594                         keyItems.add(keyDownloadOperation);
 595                     }
 596                 }
 597             } else {
 598                 Log_OC.d(TAG, "Canceling file download");
 599                 keyItems.add(buildRemoteName(account, file));
 600             }
 601         }
 602         for (String item: keyItems) {
 603             download = mPendingDownloads.remove(item);
 604             Log_OC.d(TAG, "Key removed: " + item);
 605
 606             if (download != null) {
 607                 download.cancel();
 608             }
 609         }
 610     }
 611 }