src/com/android/providers/downloads/DownloadService.java

   1 /*
   2  * Copyright (C) 2008 The Android Open Source Project
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package com.android.providers.downloads;
  18
  19 import com.google.android.collect.Lists;
  20
  21 import android.app.AlarmManager;
  22 import android.app.PendingIntent;
  23 import android.app.Service;
  24 import android.content.ComponentName;
  25 import android.content.ContentUris;
  26 import android.content.ContentValues;
  27 import android.content.Context;
  28 import android.content.Intent;
  29 import android.content.ServiceConnection;
  30 import android.content.pm.PackageManager;
  31 import android.content.pm.ResolveInfo;
  32 import android.database.CharArrayBuffer;
  33 import android.database.ContentObserver;
  34 import android.database.Cursor;
  35 import android.drm.mobile1.DrmRawContent;
  36 import android.media.IMediaScannerService;
  37 import android.net.Uri;
  38 import android.os.Environment;
  39 import android.os.Handler;
  40 import android.os.IBinder;
  41 import android.os.Process;
  42 import android.os.RemoteException;
  43 import android.provider.Downloads;
  44 import android.util.Config;
  45 import android.util.Log;
  46
  47 import java.io.File;
  48 import java.util.ArrayList;
  49 import java.util.HashSet;
  50 import java.util.Iterator;
  51 import java.util.List;
  52
  53
  54 /**
  55  * Performs the background downloads requested by applications that use the Downloads provider.
  56  */
  57 public class DownloadService extends Service {
  58
  59     /* ------------ Constants ------------ */
  60
  61     /* ------------ Members ------------ */
  62
  63     /** Observer to get notified when the content observer's data changes */
  64     private DownloadManagerContentObserver mObserver;
  65
  66     /** Class to handle Notification Manager updates */
  67     private DownloadNotification mNotifier;
  68
  69     /**
  70      * The Service's view of the list of downloads. This is kept independently
  71      * from the content provider, and the Service only initiates downloads
  72      * based on this data, so that it can deal with situation where the data
  73      * in the content provider changes or disappears.
  74      */
  75     private ArrayList<DownloadInfo> mDownloads;
  76
  77     /**
  78      * The thread that updates the internal download list from the content
  79      * provider.
  80      */
  81     private UpdateThread mUpdateThread;
  82
  83     /**
  84      * Whether the internal download list should be updated from the content
  85      * provider.
  86      */
  87     private boolean mPendingUpdate;
  88
  89     /**
  90      * The ServiceConnection object that tells us when we're connected to and disconnected from
  91      * the Media Scanner
  92      */
  93     private MediaScannerConnection mMediaScannerConnection;
  94
  95     private boolean mMediaScannerConnecting;
  96
  97     /**
  98      * The IPC interface to the Media Scanner
  99      */
 100     private IMediaScannerService mMediaScannerService;
 101
 102     /**
 103      * Array used when extracting strings from content provider
 104      */
 105     private CharArrayBuffer oldChars;
 106
 107     /**
 108      * Array used when extracting strings from content provider
 109      */
 110     private CharArrayBuffer mNewChars;
 111
 112     /* ------------ Inner Classes ------------ */
 113
 114     /**
 115      * Receives notifications when the data in the content provider changes
 116      */
 117     private class DownloadManagerContentObserver extends ContentObserver {
 118
 119         public DownloadManagerContentObserver() {
 120             super(new Handler());
 121         }
 122
 123         /**
 124          * Receives notification when the data in the observed content
 125          * provider changes.
 126          */
 127         public void onChange(final boolean selfChange) {
 128             if (Constants.LOGVV) {
 129                 Log.v(Constants.TAG, "Service ContentObserver received notification");
 130             }
 131             updateFromProvider();
 132         }
 133
 134     }
 135
 136     /**
 137      * Gets called back when the connection to the media
 138      * scanner is established or lost.
 139      */
 140     public class MediaScannerConnection implements ServiceConnection {
 141         public void onServiceConnected(ComponentName className, IBinder service) {
 142             if (Constants.LOGVV) {
 143                 Log.v(Constants.TAG, "Connected to Media Scanner");
 144             }
 145             mMediaScannerConnecting = false;
 146             synchronized (DownloadService.this) {
 147                 mMediaScannerService = IMediaScannerService.Stub.asInterface(service);
 148                 if (mMediaScannerService != null) {
 149                     updateFromProvider();
 150                 }
 151             }
 152         }
 153
 154         public void disconnectMediaScanner() {
 155             synchronized (DownloadService.this) {
 156                 if (mMediaScannerService != null) {
 157                     mMediaScannerService = null;
 158                     if (Constants.LOGVV) {
 159                         Log.v(Constants.TAG, "Disconnecting from Media Scanner");
 160                     }
 161                     try {
 162                         unbindService(this);
 163                     } catch (IllegalArgumentException ex) {
 164                         if (Constants.LOGV) {
 165                             Log.v(Constants.TAG, "unbindService threw up: " + ex);
 166                         }
 167                     }
 168                 }
 169             }
 170         }
 171
 172         public void onServiceDisconnected(ComponentName className) {
 173             if (Constants.LOGVV) {
 174                 Log.v(Constants.TAG, "Disconnected from Media Scanner");
 175             }
 176             synchronized (DownloadService.this) {
 177                 mMediaScannerService = null;
 178             }
 179         }
 180     }
 181
 182     /* ------------ Methods ------------ */
 183
 184     /**
 185      * Returns an IBinder instance when someone wants to connect to this
 186      * service. Binding to this service is not allowed.
 187      *
 188      * @throws UnsupportedOperationException
 189      */
 190     public IBinder onBind(Intent i) {
 191         throw new UnsupportedOperationException("Cannot bind to Download Manager Service");
 192     }
 193
 194     /**
 195      * Initializes the service when it is first created
 196      */
 197     public void onCreate() {
 198         super.onCreate();
 199         if (Constants.LOGVV) {
 200             Log.v(Constants.TAG, "Service onCreate");
 201         }
 202
 203         mDownloads = Lists.newArrayList();
 204
 205         mObserver = new DownloadManagerContentObserver();
 206         getContentResolver().registerContentObserver(Downloads.CONTENT_URI,
 207                 true, mObserver);
 208
 209         mMediaScannerService = null;
 210         mMediaScannerConnecting = false;
 211         mMediaScannerConnection = new MediaScannerConnection();
 212
 213         mNotifier = new DownloadNotification(this);
 214         mNotifier.mNotificationMgr.cancelAll();
 215         mNotifier.updateNotification();
 216
 217         trimDatabase();
 218         removeSpuriousFiles();
 219         updateFromProvider();
 220     }
 221
 222     /**
 223      * Responds to a call to startService
 224      */
 225     public void onStart(Intent intent, int startId) {
 226         super.onStart(intent, startId);
 227         if (Constants.LOGVV) {
 228             Log.v(Constants.TAG, "Service onStart");
 229         }
 230
 231         updateFromProvider();
 232     }
 233
 234     /**
 235      * Cleans up when the service is destroyed
 236      */
 237     public void onDestroy() {
 238         getContentResolver().unregisterContentObserver(mObserver);
 239         if (Constants.LOGVV) {
 240             Log.v(Constants.TAG, "Service onDestroy");
 241         }
 242         super.onDestroy();
 243     }
 244
 245     /**
 246      * Parses data from the content provider into private array
 247      */
 248     private void updateFromProvider() {
 249         synchronized (this) {
 250             mPendingUpdate = true;
 251             if (mUpdateThread == null) {
 252                 mUpdateThread = new UpdateThread();
 253                 mUpdateThread.start();
 254             }
 255         }
 256     }
 257
 258     private class UpdateThread extends Thread {
 259         public UpdateThread() {
 260             super("Download Service");
 261         }
 262
 263         public void run() {
 264             Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
 265
 266             boolean keepService = false;
 267             // for each update from the database, remember which download is
 268             // supposed to get restarted soonest in the future
 269             long wakeUp = Long.MAX_VALUE;
 270             for (;;) {
 271                 synchronized (DownloadService.this) {
 272                     if (mUpdateThread != this) {
 273                         throw new IllegalStateException(
 274                                 "multiple UpdateThreads in DownloadService");
 275                     }
 276                     if (!mPendingUpdate) {
 277                         mUpdateThread = null;
 278                         if (!keepService) {
 279                             stopSelf();
 280                         }
 281                         if (wakeUp != Long.MAX_VALUE) {
 282                             AlarmManager alarms =
 283                                     (AlarmManager) getSystemService(Context.ALARM_SERVICE);
 284                             if (alarms == null) {
 285                                 Log.e(Constants.TAG, "couldn't get alarm manager");
 286                             } else {
 287                                 if (Constants.LOGV) {
 288                                     Log.v(Constants.TAG, "scheduling retry in " + wakeUp + "ms");
 289                                 }
 290                                 Intent intent = new Intent(Constants.ACTION_RETRY);
 291                                 intent.setClassName("com.android.providers.downloads",
 292                                         DownloadReceiver.class.getName());
 293                                 alarms.set(
 294                                         AlarmManager.RTC_WAKEUP,
 295                                         System.currentTimeMillis() + wakeUp,
 296                                         PendingIntent.getBroadcast(DownloadService.this, 0, intent,
 297                                                 PendingIntent.FLAG_ONE_SHOT));
 298                             }
 299                         }
 300                         oldChars = null;
 301                         mNewChars = null;
 302                         return;
 303                     }
 304                     mPendingUpdate = false;
 305                 }
 306                 boolean networkAvailable = Helpers.isNetworkAvailable(DownloadService.this);
 307                 boolean networkRoaming = Helpers.isNetworkRoaming(DownloadService.this);
 308                 long now = System.currentTimeMillis();
 309
 310                 Cursor cursor = getContentResolver().query(Downloads.CONTENT_URI,
 311                         null, null, null, Downloads._ID);
 312
 313                 if (cursor == null) {
 314                     // TODO: this doesn't look right, it'd leave the loop in an inconsistent state
 315                     return;
 316                 }
 317
 318                 cursor.moveToFirst();
 319
 320                 int arrayPos = 0;
 321
 322                 boolean mustScan = false;
 323                 keepService = false;
 324                 wakeUp = Long.MAX_VALUE;
 325
 326                 boolean isAfterLast = cursor.isAfterLast();
 327
 328                 int idColumn = cursor.getColumnIndexOrThrow(Downloads._ID);
 329
 330                 /*
 331                  * Walk the cursor and the local array to keep them in sync. The key
 332                  *     to the algorithm is that the ids are unique and sorted both in
 333                  *     the cursor and in the array, so that they can be processed in
 334                  *     order in both sources at the same time: at each step, both
 335                  *     sources point to the lowest id that hasn't been processed from
 336                  *     that source, and the algorithm processes the lowest id from
 337                  *     those two possibilities.
 338                  * At each step:
 339                  * -If the array contains an entry that's not in the cursor, remove the
 340                  *     entry, move to next entry in the array.
 341                  * -If the array contains an entry that's in the cursor, nothing to do,
 342                  *     move to next cursor row and next array entry.
 343                  * -If the cursor contains an entry that's not in the array, insert
 344                  *     a new entry in the array, move to next cursor row and next
 345                  *     array entry.
 346                  */
 347                 while (!isAfterLast || arrayPos < mDownloads.size()) {
 348                     if (isAfterLast) {
 349                         // We're beyond the end of the cursor but there's still some
 350                         //     stuff in the local array, which can only be junk
 351                         if (Constants.LOGVV) {
 352                             int arrayId = ((DownloadInfo) mDownloads.get(arrayPos)).mId;
 353                             Log.v(Constants.TAG, "Array update: trimming " +
 354                                     arrayId + " @ "  + arrayPos);
 355                         }
 356                         if (shouldScanFile(arrayPos) && mediaScannerConnected()) {
 357                             scanFile(null, arrayPos);
 358                         }
 359                         deleteDownload(arrayPos); // this advances in the array
 360                     } else {
 361                         int id = cursor.getInt(idColumn);
 362
 363                         if (arrayPos == mDownloads.size()) {
 364                             insertDownload(cursor, arrayPos, networkAvailable, networkRoaming, now);
 365                             if (Constants.LOGVV) {
 366                                 Log.v(Constants.TAG, "Array update: appending " +
 367                                         id + " @ " + arrayPos);
 368                             }
 369                             if (shouldScanFile(arrayPos)
 370                                     && (!mediaScannerConnected() || !scanFile(cursor, arrayPos))) {
 371                                 mustScan = true;
 372                                 keepService = true;
 373                             }
 374                             if (visibleNotification(arrayPos)) {
 375                                 keepService = true;
 376                             }
 377                             long next = nextAction(arrayPos, now);
 378                             if (next == 0) {
 379                                 keepService = true;
 380                             } else if (next > 0 && next < wakeUp) {
 381                                 wakeUp = next;
 382                             }
 383                             ++arrayPos;
 384                             cursor.moveToNext();
 385                             isAfterLast = cursor.isAfterLast();
 386                         } else {
 387                             int arrayId = mDownloads.get(arrayPos).mId;
 388
 389                             if (arrayId < id) {
 390                                 // The array entry isn't in the cursor
 391                                 if (Constants.LOGVV) {
 392                                     Log.v(Constants.TAG, "Array update: removing " + arrayId
 393                                             + " @ " + arrayPos);
 394                                 }
 395                                 if (shouldScanFile(arrayPos) && mediaScannerConnected()) {
 396                                     scanFile(null, arrayPos);
 397                                 }
 398                                 deleteDownload(arrayPos); // this advances in the array
 399                             } else if (arrayId == id) {
 400                                 // This cursor row already exists in the stored array
 401                                 updateDownload(
 402                                         cursor, arrayPos,
 403                                         networkAvailable, networkRoaming, now);
 404                                 if (shouldScanFile(arrayPos)
 405                                         && (!mediaScannerConnected()
 406                                                 || !scanFile(cursor, arrayPos))) {
 407                                     mustScan = true;
 408                                     keepService = true;
 409                                 }
 410                                 if (visibleNotification(arrayPos)) {
 411                                     keepService = true;
 412                                 }
 413                                 long next = nextAction(arrayPos, now);
 414                                 if (next == 0) {
 415                                     keepService = true;
 416                                 } else if (next > 0 && next < wakeUp) {
 417                                     wakeUp = next;
 418                                 }
 419                                 ++arrayPos;
 420                                 cursor.moveToNext();
 421                                 isAfterLast = cursor.isAfterLast();
 422                             } else {
 423                                 // This cursor entry didn't exist in the stored array
 424                                 if (Constants.LOGVV) {
 425                                     Log.v(Constants.TAG, "Array update: inserting " +
 426                                             id + " @ " + arrayPos);
 427                                 }
 428                                 insertDownload(
 429                                         cursor, arrayPos,
 430                                         networkAvailable, networkRoaming, now);
 431                                 if (shouldScanFile(arrayPos)
 432                                         && (!mediaScannerConnected()
 433                                                 || !scanFile(cursor, arrayPos))) {
 434                                     mustScan = true;
 435                                     keepService = true;
 436                                 }
 437                                 if (visibleNotification(arrayPos)) {
 438                                     keepService = true;
 439                                 }
 440                                 long next = nextAction(arrayPos, now);
 441                                 if (next == 0) {
 442                                     keepService = true;
 443                                 } else if (next > 0 && next < wakeUp) {
 444                                     wakeUp = next;
 445                                 }
 446                                 ++arrayPos;
 447                                 cursor.moveToNext();
 448                                 isAfterLast = cursor.isAfterLast();
 449                             }
 450                         }
 451                     }
 452                 }
 453
 454                 mNotifier.updateNotification();
 455
 456                 if (mustScan) {
 457                     if (!mMediaScannerConnecting) {
 458                         Intent intent = new Intent();
 459                         intent.setClassName("com.android.providers.media",
 460                                 "com.android.providers.media.MediaScannerService");
 461                         mMediaScannerConnecting = true;
 462                         bindService(intent, mMediaScannerConnection, BIND_AUTO_CREATE);
 463                     }
 464                 } else {
 465                     mMediaScannerConnection.disconnectMediaScanner();
 466                 }
 467
 468                 cursor.close();
 469             }
 470         }
 471     }
 472
 473     /**
 474      * Removes files that may have been left behind in the cache directory
 475      */
 476     private void removeSpuriousFiles() {
 477         File[] files = Environment.getDownloadCacheDirectory().listFiles();
 478         if (files == null) {
 479             // The cache folder doesn't appear to exist (this is likely the case
 480             // when running the simulator).
 481             return;
 482         }
 483         HashSet<String> fileSet = new HashSet();
 484         for (int i = 0; i < files.length; i++) {
 485             if (files[i].getName().equals(Constants.KNOWN_SPURIOUS_FILENAME)) {
 486                 continue;
 487             }
 488             if (files[i].getName().equalsIgnoreCase(Constants.RECOVERY_DIRECTORY)) {
 489                 continue;
 490             }
 491             fileSet.add(files[i].getPath());
 492         }
 493
 494         Cursor cursor = getContentResolver().query(Downloads.CONTENT_URI,
 495                 new String[] { Downloads._DATA }, null, null, null);
 496         if (cursor != null) {
 497             if (cursor.moveToFirst()) {
 498                 do {
 499                     fileSet.remove(cursor.getString(0));
 500                 } while (cursor.moveToNext());
 501             }
 502             cursor.close();
 503         }
 504         Iterator<String> iterator = fileSet.iterator();
 505         while (iterator.hasNext()) {
 506             String filename = iterator.next();
 507             if (Constants.LOGV) {
 508                 Log.v(Constants.TAG, "deleting spurious file " + filename);
 509             }
 510             new File(filename).delete();
 511         }
 512     }
 513
 514     /**
 515      * Drops old rows from the database to prevent it from growing too large
 516      */
 517     private void trimDatabase() {
 518         Cursor cursor = getContentResolver().query(Downloads.CONTENT_URI,
 519                 new String[] { Downloads._ID },
 520                 Downloads.COLUMN_STATUS + " >= '200'", null,
 521                 Downloads.COLUMN_LAST_MODIFICATION);
 522         if (cursor == null) {
 523             // This isn't good - if we can't do basic queries in our database, nothing's gonna work
 524             Log.e(Constants.TAG, "null cursor in trimDatabase");
 525             return;
 526         }
 527         if (cursor.moveToFirst()) {
 528             int numDelete = cursor.getCount() - Constants.MAX_DOWNLOADS;
 529             int columnId = cursor.getColumnIndexOrThrow(Downloads._ID);
 530             while (numDelete > 0) {
 531                 getContentResolver().delete(
 532                         ContentUris.withAppendedId(Downloads.CONTENT_URI, cursor.getLong(columnId)),
 533                         null, null);
 534                 if (!cursor.moveToNext()) {
 535                     break;
 536                 }
 537                 numDelete--;
 538             }
 539         }
 540         cursor.close();
 541     }
 542
 543     /**
 544      * Keeps a local copy of the info about a download, and initiates the
 545      * download if appropriate.
 546      */
 547     private void insertDownload(
 548             Cursor cursor, int arrayPos,
 549             boolean networkAvailable, boolean networkRoaming, long now) {
 550         int statusColumn = cursor.getColumnIndexOrThrow(Downloads.COLUMN_STATUS);
 551         int failedColumn = cursor.getColumnIndexOrThrow(Constants.FAILED_CONNECTIONS);
 552         int retryRedirect =
 553                 cursor.getInt(cursor.getColumnIndexOrThrow(Constants.RETRY_AFTER_X_REDIRECT_COUNT));
 554         DownloadInfo info = new DownloadInfo(
 555                 cursor.getInt(cursor.getColumnIndexOrThrow(Downloads._ID)),
 556                 cursor.getString(cursor.getColumnIndexOrThrow(Downloads.COLUMN_URI)),
 557                 cursor.getInt(cursor.getColumnIndexOrThrow(Downloads.COLUMN_NO_INTEGRITY)) == 1,
 558                 cursor.getString(cursor.getColumnIndexOrThrow(Downloads.COLUMN_FILE_NAME_HINT)),
 559                 cursor.getString(cursor.getColumnIndexOrThrow(Downloads._DATA)),
 560                 cursor.getString(cursor.getColumnIndexOrThrow(Downloads.COLUMN_MIME_TYPE)),
 561                 cursor.getInt(cursor.getColumnIndexOrThrow(Downloads.COLUMN_DESTINATION)),
 562                 cursor.getInt(cursor.getColumnIndexOrThrow(Downloads.COLUMN_VISIBILITY)),
 563                 cursor.getInt(cursor.getColumnIndexOrThrow(Downloads.COLUMN_CONTROL)),
 564                 cursor.getInt(statusColumn),
 565                 cursor.getInt(failedColumn),
 566                 retryRedirect & 0xfffffff,
 567                 retryRedirect >> 28,
 568                 cursor.getLong(cursor.getColumnIndexOrThrow(Downloads.COLUMN_LAST_MODIFICATION)),
 569                 cursor.getString(cursor.getColumnIndexOrThrow(
 570                         Downloads.COLUMN_NOTIFICATION_PACKAGE)),
 571                 cursor.getString(cursor.getColumnIndexOrThrow(Downloads.COLUMN_NOTIFICATION_CLASS)),
 572                 cursor.getString(cursor.getColumnIndexOrThrow(
 573                         Downloads.COLUMN_NOTIFICATION_EXTRAS)),
 574                 cursor.getString(cursor.getColumnIndexOrThrow(Downloads.COLUMN_COOKIE_DATA)),
 575                 cursor.getString(cursor.getColumnIndexOrThrow(Downloads.COLUMN_USER_AGENT)),
 576                 cursor.getString(cursor.getColumnIndexOrThrow(Downloads.COLUMN_REFERER)),
 577                 cursor.getInt(cursor.getColumnIndexOrThrow(Downloads.COLUMN_TOTAL_BYTES)),
 578                 cursor.getInt(cursor.getColumnIndexOrThrow(Downloads.COLUMN_CURRENT_BYTES)),
 579                 cursor.getString(cursor.getColumnIndexOrThrow(Constants.ETAG)),
 580                 cursor.getInt(cursor.getColumnIndexOrThrow(Constants.MEDIA_SCANNED)) == 1);
 581
 582         if (Constants.LOGVV) {
 583             Log.v(Constants.TAG, "Service adding new entry");
 584             Log.v(Constants.TAG, "ID      : " + info.mId);
 585             Log.v(Constants.TAG, "URI     : " + ((info.mUri != null) ? "yes" : "no"));
 586             Log.v(Constants.TAG, "NO_INTEG: " + info.mNoIntegrity);
 587             Log.v(Constants.TAG, "HINT    : " + info.mHint);
 588             Log.v(Constants.TAG, "FILENAME: " + info.mFileName);
 589             Log.v(Constants.TAG, "MIMETYPE: " + info.mMimeType);
 590             Log.v(Constants.TAG, "DESTINAT: " + info.mDestination);
 591             Log.v(Constants.TAG, "VISIBILI: " + info.mVisibility);
 592             Log.v(Constants.TAG, "CONTROL : " + info.mControl);
 593             Log.v(Constants.TAG, "STATUS  : " + info.mStatus);
 594             Log.v(Constants.TAG, "FAILED_C: " + info.mNumFailed);
 595             Log.v(Constants.TAG, "RETRY_AF: " + info.mRetryAfter);
 596             Log.v(Constants.TAG, "REDIRECT: " + info.mRedirectCount);
 597             Log.v(Constants.TAG, "LAST_MOD: " + info.mLastMod);
 598             Log.v(Constants.TAG, "PACKAGE : " + info.mPackage);
 599             Log.v(Constants.TAG, "CLASS   : " + info.mClass);
 600             Log.v(Constants.TAG, "COOKIES : " + ((info.mCookies != null) ? "yes" : "no"));
 601             Log.v(Constants.TAG, "AGENT   : " + info.mUserAgent);
 602             Log.v(Constants.TAG, "REFERER : " + ((info.mReferer != null) ? "yes" : "no"));
 603             Log.v(Constants.TAG, "TOTAL   : " + info.mTotalBytes);
 604             Log.v(Constants.TAG, "CURRENT : " + info.mCurrentBytes);
 605             Log.v(Constants.TAG, "ETAG    : " + info.mETag);
 606             Log.v(Constants.TAG, "SCANNED : " + info.mMediaScanned);
 607         }
 608
 609         mDownloads.add(arrayPos, info);
 610
 611         if (info.mStatus == 0
 612                 && (info.mDestination == Downloads.DESTINATION_EXTERNAL
 613                     || info.mDestination == Downloads.DESTINATION_CACHE_PARTITION_PURGEABLE)
 614                 && info.mMimeType != null
 615                 && !DrmRawContent.DRM_MIMETYPE_MESSAGE_STRING.equalsIgnoreCase(info.mMimeType)) {
 616             // Check to see if we are allowed to download this file. Only files
 617             // that can be handled by the platform can be downloaded.
 618             // special case DRM files, which we should always allow downloading.
 619             Intent mimetypeIntent = new Intent(Intent.ACTION_VIEW);
 620
 621             // We can provide data as either content: or file: URIs,
 622             // so allow both.  (I think it would be nice if we just did
 623             // everything as content: URIs)
 624             // Actually, right now the download manager's UId restrictions
 625             // prevent use from using content: so it's got to be file: or
 626             // nothing
 627
 628             mimetypeIntent.setDataAndType(Uri.fromParts("file", "", null), info.mMimeType);
 629             ResolveInfo ri = getPackageManager().resolveActivity(mimetypeIntent,
 630                     PackageManager.MATCH_DEFAULT_ONLY);
 631             //Log.i(Constants.TAG, "*** QUERY " + mimetypeIntent + ": " + list);
 632
 633             if (ri == null) {
 634                 if (Config.LOGD) {
 635                     Log.d(Constants.TAG, "no application to handle MIME type " + info.mMimeType);
 636                 }
 637                 info.mStatus = Downloads.STATUS_NOT_ACCEPTABLE;
 638
 639                 Uri uri = ContentUris.withAppendedId(Downloads.CONTENT_URI, info.mId);
 640                 ContentValues values = new ContentValues();
 641                 values.put(Downloads.COLUMN_STATUS, Downloads.STATUS_NOT_ACCEPTABLE);
 642                 getContentResolver().update(uri, values, null, null);
 643                 info.sendIntentIfRequested(uri, this);
 644                 return;
 645             }
 646         }
 647
 648         if (info.canUseNetwork(networkAvailable, networkRoaming)) {
 649             if (info.isReadyToStart(now)) {
 650                 if (Constants.LOGV) {
 651                     Log.v(Constants.TAG, "Service spawning thread to handle new download " +
 652                             info.mId);
 653                 }
 654                 if (info.mHasActiveThread) {
 655                     throw new IllegalStateException("Multiple threads on same download on insert");
 656                 }
 657                 if (info.mStatus != Downloads.STATUS_RUNNING) {
 658                     info.mStatus = Downloads.STATUS_RUNNING;
 659                     ContentValues values = new ContentValues();
 660                     values.put(Downloads.COLUMN_STATUS, info.mStatus);
 661                     getContentResolver().update(
 662                             ContentUris.withAppendedId(Downloads.CONTENT_URI, info.mId),
 663                             values, null, null);
 664                 }
 665                 DownloadThread downloader = new DownloadThread(this, info);
 666                 info.mHasActiveThread = true;
 667                 downloader.start();
 668             }
 669         } else {
 670             if (info.mStatus == 0
 671                     || info.mStatus == Downloads.STATUS_PENDING
 672                     || info.mStatus == Downloads.STATUS_RUNNING) {
 673                 info.mStatus = Downloads.STATUS_RUNNING_PAUSED;
 674                 Uri uri = ContentUris.withAppendedId(Downloads.CONTENT_URI, info.mId);
 675                 ContentValues values = new ContentValues();
 676                 values.put(Downloads.COLUMN_STATUS, Downloads.STATUS_RUNNING_PAUSED);
 677                 getContentResolver().update(uri, values, null, null);
 678             }
 679         }
 680     }
 681
 682     /**
 683      * Updates the local copy of the info about a download.
 684      */
 685     private void updateDownload(
 686             Cursor cursor, int arrayPos,
 687             boolean networkAvailable, boolean networkRoaming, long now) {
 688         DownloadInfo info = (DownloadInfo) mDownloads.get(arrayPos);
 689         int statusColumn = cursor.getColumnIndexOrThrow(Downloads.COLUMN_STATUS);
 690         int failedColumn = cursor.getColumnIndexOrThrow(Constants.FAILED_CONNECTIONS);
 691         info.mId = cursor.getInt(cursor.getColumnIndexOrThrow(Downloads._ID));
 692         info.mUri = stringFromCursor(info.mUri, cursor, Downloads.COLUMN_URI);
 693         info.mNoIntegrity =
 694                 cursor.getInt(cursor.getColumnIndexOrThrow(Downloads.COLUMN_NO_INTEGRITY)) == 1;
 695         info.mHint = stringFromCursor(info.mHint, cursor, Downloads.COLUMN_FILE_NAME_HINT);
 696         info.mFileName = stringFromCursor(info.mFileName, cursor, Downloads._DATA);
 697         info.mMimeType = stringFromCursor(info.mMimeType, cursor, Downloads.COLUMN_MIME_TYPE);
 698         info.mDestination = cursor.getInt(cursor.getColumnIndexOrThrow(
 699                 Downloads.COLUMN_DESTINATION));
 700         int newVisibility = cursor.getInt(cursor.getColumnIndexOrThrow(
 701                 Downloads.COLUMN_VISIBILITY));
 702         if (info.mVisibility == Downloads.VISIBILITY_VISIBLE_NOTIFY_COMPLETED
 703                 && newVisibility != Downloads.VISIBILITY_VISIBLE_NOTIFY_COMPLETED
 704                 && Downloads.isStatusCompleted(info.mStatus)) {
 705             mNotifier.mNotificationMgr.cancel(info.mId);
 706         }
 707         info.mVisibility = newVisibility;
 708         synchronized (info) {
 709             info.mControl = cursor.getInt(cursor.getColumnIndexOrThrow(Downloads.COLUMN_CONTROL));
 710         }
 711         int newStatus = cursor.getInt(statusColumn);
 712         if (!Downloads.isStatusCompleted(info.mStatus) && Downloads.isStatusCompleted(newStatus)) {
 713             mNotifier.mNotificationMgr.cancel(info.mId);
 714         }
 715         info.mStatus = newStatus;
 716         info.mNumFailed = cursor.getInt(failedColumn);
 717         int retryRedirect =
 718                 cursor.getInt(cursor.getColumnIndexOrThrow(Constants.RETRY_AFTER_X_REDIRECT_COUNT));
 719         info.mRetryAfter = retryRedirect & 0xfffffff;
 720         info.mRedirectCount = retryRedirect >> 28;
 721         info.mLastMod = cursor.getLong(cursor.getColumnIndexOrThrow(
 722                 Downloads.COLUMN_LAST_MODIFICATION));
 723         info.mPackage = stringFromCursor(
 724                 info.mPackage, cursor, Downloads.COLUMN_NOTIFICATION_PACKAGE);
 725         info.mClass = stringFromCursor(info.mClass, cursor, Downloads.COLUMN_NOTIFICATION_CLASS);
 726         info.mCookies = stringFromCursor(info.mCookies, cursor, Downloads.COLUMN_COOKIE_DATA);
 727         info.mUserAgent = stringFromCursor(info.mUserAgent, cursor, Downloads.COLUMN_USER_AGENT);
 728         info.mReferer = stringFromCursor(info.mReferer, cursor, Downloads.COLUMN_REFERER);
 729         info.mTotalBytes = cursor.getInt(cursor.getColumnIndexOrThrow(
 730                 Downloads.COLUMN_TOTAL_BYTES));
 731         info.mCurrentBytes = cursor.getInt(cursor.getColumnIndexOrThrow(
 732                 Downloads.COLUMN_CURRENT_BYTES));
 733         info.mETag = stringFromCursor(info.mETag, cursor, Constants.ETAG);
 734         info.mMediaScanned =
 735                 cursor.getInt(cursor.getColumnIndexOrThrow(Constants.MEDIA_SCANNED)) == 1;
 736
 737         if (info.canUseNetwork(networkAvailable, networkRoaming)) {
 738             if (info.isReadyToRestart(now)) {
 739                 if (Constants.LOGV) {
 740                     Log.v(Constants.TAG, "Service spawning thread to handle updated download " +
 741                             info.mId);
 742                 }
 743                 if (info.mHasActiveThread) {
 744                     throw new IllegalStateException("Multiple threads on same download on update");
 745                 }
 746                 info.mStatus = Downloads.STATUS_RUNNING;
 747                 ContentValues values = new ContentValues();
 748                 values.put(Downloads.COLUMN_STATUS, info.mStatus);
 749                 getContentResolver().update(
 750                         ContentUris.withAppendedId(Downloads.CONTENT_URI, info.mId),
 751                         values, null, null);
 752                 DownloadThread downloader = new DownloadThread(this, info);
 753                 info.mHasActiveThread = true;
 754                 downloader.start();
 755             }
 756         }
 757     }
 758
 759     /**
 760      * Returns a String that holds the current value of the column,
 761      * optimizing for the case where the value hasn't changed.
 762      */
 763     private String stringFromCursor(String old, Cursor cursor, String column) {
 764         int index = cursor.getColumnIndexOrThrow(column);
 765         if (old == null) {
 766             return cursor.getString(index);
 767         }
 768         if (mNewChars == null) {
 769             mNewChars = new CharArrayBuffer(128);
 770         }
 771         cursor.copyStringToBuffer(index, mNewChars);
 772         int length = mNewChars.sizeCopied;
 773         if (length != old.length()) {
 774             return cursor.getString(index);
 775         }
 776         if (oldChars == null || oldChars.sizeCopied < length) {
 777             oldChars = new CharArrayBuffer(length);
 778         }
 779         char[] oldArray = oldChars.data;
 780         char[] newArray = mNewChars.data;
 781         old.getChars(0, length, oldArray, 0);
 782         for (int i = length - 1; i >= 0; --i) {
 783             if (oldArray[i] != newArray[i]) {
 784                 return new String(newArray, 0, length);
 785             }
 786         }
 787         return old;
 788     }
 789
 790     /**
 791      * Removes the local copy of the info about a download.
 792      */
 793     private void deleteDownload(int arrayPos) {
 794         DownloadInfo info = (DownloadInfo) mDownloads.get(arrayPos);
 795         if (info.mStatus == Downloads.STATUS_RUNNING) {
 796             info.mStatus = Downloads.STATUS_CANCELED;
 797         } else if (info.mDestination != Downloads.DESTINATION_EXTERNAL && info.mFileName != null) {
 798             new File(info.mFileName).delete();
 799         }
 800         mNotifier.mNotificationMgr.cancel(info.mId);
 801
 802         mDownloads.remove(arrayPos);
 803     }
 804
 805     /**
 806      * Returns the amount of time (as measured from the "now" parameter)
 807      * at which a download will be active.
 808      * 0 = immediately - service should stick around to handle this download.
 809      * -1 = never - service can go away without ever waking up.
 810      * positive value - service must wake up in the future, as specified in ms from "now"
 811      */
 812     private long nextAction(int arrayPos, long now) {
 813         DownloadInfo info = (DownloadInfo) mDownloads.get(arrayPos);
 814         if (Downloads.isStatusCompleted(info.mStatus)) {
 815             return -1;
 816         }
 817         if (info.mStatus != Downloads.STATUS_RUNNING_PAUSED) {
 818             return 0;
 819         }
 820         if (info.mNumFailed == 0) {
 821             return 0;
 822         }
 823         long when = info.restartTime();
 824         if (when <= now) {
 825             return 0;
 826         }
 827         return when - now;
 828     }
 829
 830     /**
 831      * Returns whether there's a visible notification for this download
 832      */
 833     private boolean visibleNotification(int arrayPos) {
 834         DownloadInfo info = (DownloadInfo) mDownloads.get(arrayPos);
 835         return info.hasCompletionNotification();
 836     }
 837
 838     /**
 839      * Returns whether a file should be scanned
 840      */
 841     private boolean shouldScanFile(int arrayPos) {
 842         DownloadInfo info = (DownloadInfo) mDownloads.get(arrayPos);
 843         return !info.mMediaScanned
 844                 && info.mDestination == Downloads.DESTINATION_EXTERNAL
 845                 && Downloads.isStatusSuccess(info.mStatus)
 846                 && !DrmRawContent.DRM_MIMETYPE_MESSAGE_STRING.equalsIgnoreCase(info.mMimeType);
 847     }
 848
 849     /**
 850      * Returns whether we have a live connection to the Media Scanner
 851      */
 852     private boolean mediaScannerConnected() {
 853         return mMediaScannerService != null;
 854     }
 855
 856     /**
 857      * Attempts to scan the file if necessary.
 858      * Returns true if the file has been properly scanned.
 859      */
 860     private boolean scanFile(Cursor cursor, int arrayPos) {
 861         DownloadInfo info = (DownloadInfo) mDownloads.get(arrayPos);
 862         synchronized (this) {
 863             if (mMediaScannerService != null) {
 864                 try {
 865                     if (Constants.LOGV) {
 866                         Log.v(Constants.TAG, "Scanning file " + info.mFileName);
 867                     }
 868                     mMediaScannerService.scanFile(info.mFileName, info.mMimeType);
 869                     if (cursor != null) {
 870                         ContentValues values = new ContentValues();
 871                         values.put(Constants.MEDIA_SCANNED, 1);
 872                         getContentResolver().update(
 873                                 ContentUris.withAppendedId(Downloads.CONTENT_URI,
 874                                        cursor.getLong(cursor.getColumnIndexOrThrow(Downloads._ID))),
 875                                 values, null, null);
 876                     }
 877                     return true;
 878                 } catch (RemoteException e) {
 879                     if (Config.LOGD) {
 880                         Log.d(Constants.TAG, "Failed to scan file " + info.mFileName);
 881                     }
 882                 }
 883             }
 884         }
 885         return false;
 886     }
 887
 888 }