Garfield Tan | 75379db | 2017-02-08 15:32:56 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2017 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.internal.content; |
| 18 | |
| 19 | import android.annotation.CallSuper; |
Garfield Tan | d21af53 | 2017-04-17 14:22:32 -0700 | [diff] [blame] | 20 | import android.annotation.Nullable; |
Garfield Tan | 75379db | 2017-02-08 15:32:56 -0800 | [diff] [blame] | 21 | import android.content.ContentResolver; |
Garfield Tan | 9bd2f6c | 2017-03-10 15:38:15 -0800 | [diff] [blame] | 22 | import android.content.ContentValues; |
Garfield Tan | 75379db | 2017-02-08 15:32:56 -0800 | [diff] [blame] | 23 | import android.content.Intent; |
| 24 | import android.content.res.AssetFileDescriptor; |
| 25 | import android.database.Cursor; |
| 26 | import android.database.MatrixCursor; |
| 27 | import android.database.MatrixCursor.RowBuilder; |
| 28 | import android.graphics.Point; |
| 29 | import android.net.Uri; |
Garfield Tan | fac8aea | 2017-06-27 11:03:42 -0700 | [diff] [blame] | 30 | import android.os.Binder; |
Garfield Tan | 75379db | 2017-02-08 15:32:56 -0800 | [diff] [blame] | 31 | import android.os.CancellationSignal; |
| 32 | import android.os.FileObserver; |
| 33 | import android.os.FileUtils; |
| 34 | import android.os.Handler; |
| 35 | import android.os.ParcelFileDescriptor; |
| 36 | import android.provider.DocumentsContract; |
| 37 | import android.provider.DocumentsContract.Document; |
| 38 | import android.provider.DocumentsProvider; |
| 39 | import android.provider.MediaStore; |
| 40 | import android.text.TextUtils; |
| 41 | import android.util.ArrayMap; |
| 42 | import android.util.Log; |
| 43 | import android.webkit.MimeTypeMap; |
| 44 | |
| 45 | import com.android.internal.annotations.GuardedBy; |
| 46 | |
| 47 | import java.io.File; |
| 48 | import java.io.FileNotFoundException; |
| 49 | import java.io.IOException; |
| 50 | import java.util.LinkedList; |
| 51 | import java.util.List; |
| 52 | import java.util.Set; |
| 53 | |
| 54 | /** |
| 55 | * A helper class for {@link android.provider.DocumentsProvider} to perform file operations on local |
| 56 | * files. |
| 57 | */ |
| 58 | public abstract class FileSystemProvider extends DocumentsProvider { |
| 59 | |
| 60 | private static final String TAG = "FileSystemProvider"; |
| 61 | |
| 62 | private static final boolean LOG_INOTIFY = false; |
| 63 | |
| 64 | private String[] mDefaultProjection; |
| 65 | |
| 66 | @GuardedBy("mObservers") |
| 67 | private final ArrayMap<File, DirectoryObserver> mObservers = new ArrayMap<>(); |
| 68 | |
| 69 | private Handler mHandler; |
| 70 | |
| 71 | protected abstract File getFileForDocId(String docId, boolean visible) |
| 72 | throws FileNotFoundException; |
| 73 | |
| 74 | protected abstract String getDocIdForFile(File file) throws FileNotFoundException; |
| 75 | |
| 76 | protected abstract Uri buildNotificationUri(String docId); |
| 77 | |
| 78 | @Override |
| 79 | public boolean onCreate() { |
| 80 | throw new UnsupportedOperationException( |
| 81 | "Subclass should override this and call onCreate(defaultDocumentProjection)"); |
| 82 | } |
| 83 | |
| 84 | @CallSuper |
| 85 | protected void onCreate(String[] defaultProjection) { |
| 86 | mHandler = new Handler(); |
| 87 | mDefaultProjection = defaultProjection; |
| 88 | } |
| 89 | |
| 90 | @Override |
| 91 | public boolean isChildDocument(String parentDocId, String docId) { |
| 92 | try { |
| 93 | final File parent = getFileForDocId(parentDocId).getCanonicalFile(); |
| 94 | final File doc = getFileForDocId(docId).getCanonicalFile(); |
| 95 | return FileUtils.contains(parent, doc); |
| 96 | } catch (IOException e) { |
| 97 | throw new IllegalArgumentException( |
| 98 | "Failed to determine if " + docId + " is child of " + parentDocId + ": " + e); |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | protected final List<String> findDocumentPath(File parent, File doc) |
| 103 | throws FileNotFoundException { |
| 104 | |
| 105 | if (!doc.exists()) { |
| 106 | throw new FileNotFoundException(doc + " is not found."); |
| 107 | } |
| 108 | |
| 109 | if (!FileUtils.contains(parent, doc)) { |
| 110 | throw new FileNotFoundException(doc + " is not found under " + parent); |
| 111 | } |
| 112 | |
| 113 | LinkedList<String> path = new LinkedList<>(); |
| 114 | while (doc != null && FileUtils.contains(parent, doc)) { |
| 115 | path.addFirst(getDocIdForFile(doc)); |
| 116 | |
| 117 | doc = doc.getParentFile(); |
| 118 | } |
| 119 | |
| 120 | return path; |
| 121 | } |
| 122 | |
| 123 | @Override |
| 124 | public String createDocument(String docId, String mimeType, String displayName) |
| 125 | throws FileNotFoundException { |
| 126 | displayName = FileUtils.buildValidFatFilename(displayName); |
| 127 | |
| 128 | final File parent = getFileForDocId(docId); |
| 129 | if (!parent.isDirectory()) { |
| 130 | throw new IllegalArgumentException("Parent document isn't a directory"); |
| 131 | } |
| 132 | |
| 133 | final File file = FileUtils.buildUniqueFile(parent, mimeType, displayName); |
Garfield Tan | 9361541 | 2017-03-20 17:21:55 -0700 | [diff] [blame] | 134 | final String childId; |
Garfield Tan | 75379db | 2017-02-08 15:32:56 -0800 | [diff] [blame] | 135 | if (Document.MIME_TYPE_DIR.equals(mimeType)) { |
| 136 | if (!file.mkdir()) { |
| 137 | throw new IllegalStateException("Failed to mkdir " + file); |
| 138 | } |
Garfield Tan | 9361541 | 2017-03-20 17:21:55 -0700 | [diff] [blame] | 139 | childId = getDocIdForFile(file); |
| 140 | addFolderToMediaStore(getFileForDocId(childId, true)); |
Garfield Tan | 75379db | 2017-02-08 15:32:56 -0800 | [diff] [blame] | 141 | } else { |
| 142 | try { |
| 143 | if (!file.createNewFile()) { |
| 144 | throw new IllegalStateException("Failed to touch " + file); |
| 145 | } |
Garfield Tan | 9361541 | 2017-03-20 17:21:55 -0700 | [diff] [blame] | 146 | childId = getDocIdForFile(file); |
Garfield Tan | 75379db | 2017-02-08 15:32:56 -0800 | [diff] [blame] | 147 | } catch (IOException e) { |
| 148 | throw new IllegalStateException("Failed to touch " + file + ": " + e); |
| 149 | } |
| 150 | } |
| 151 | |
Garfield Tan | 9361541 | 2017-03-20 17:21:55 -0700 | [diff] [blame] | 152 | return childId; |
| 153 | } |
| 154 | |
Garfield Tan | d21af53 | 2017-04-17 14:22:32 -0700 | [diff] [blame] | 155 | private void addFolderToMediaStore(@Nullable File visibleFolder) { |
| 156 | // visibleFolder is null if we're adding a folder to external thumb drive or SD card. |
| 157 | if (visibleFolder != null) { |
| 158 | assert (visibleFolder.isDirectory()); |
Garfield Tan | 9361541 | 2017-03-20 17:21:55 -0700 | [diff] [blame] | 159 | |
Garfield Tan | fac8aea | 2017-06-27 11:03:42 -0700 | [diff] [blame] | 160 | final long token = Binder.clearCallingIdentity(); |
| 161 | |
| 162 | try { |
| 163 | final ContentResolver resolver = getContext().getContentResolver(); |
| 164 | final Uri uri = MediaStore.Files.getDirectoryUri("external"); |
| 165 | ContentValues values = new ContentValues(); |
| 166 | values.put(MediaStore.Files.FileColumns.DATA, visibleFolder.getAbsolutePath()); |
| 167 | resolver.insert(uri, values); |
| 168 | } finally { |
| 169 | Binder.restoreCallingIdentity(token); |
| 170 | } |
Garfield Tan | d21af53 | 2017-04-17 14:22:32 -0700 | [diff] [blame] | 171 | } |
Garfield Tan | 75379db | 2017-02-08 15:32:56 -0800 | [diff] [blame] | 172 | } |
| 173 | |
| 174 | @Override |
| 175 | public String renameDocument(String docId, String displayName) throws FileNotFoundException { |
| 176 | // Since this provider treats renames as generating a completely new |
| 177 | // docId, we're okay with letting the MIME type change. |
| 178 | displayName = FileUtils.buildValidFatFilename(displayName); |
| 179 | |
| 180 | final File before = getFileForDocId(docId); |
| 181 | final File after = FileUtils.buildUniqueFile(before.getParentFile(), displayName); |
| 182 | final File visibleFileBefore = getFileForDocId(docId, true); |
| 183 | if (!before.renameTo(after)) { |
| 184 | throw new IllegalStateException("Failed to rename to " + after); |
| 185 | } |
Garfield Tan | 75379db | 2017-02-08 15:32:56 -0800 | [diff] [blame] | 186 | |
| 187 | final String afterDocId = getDocIdForFile(after); |
Garfield Tan | 9bd2f6c | 2017-03-10 15:38:15 -0800 | [diff] [blame] | 188 | moveInMediaStore(visibleFileBefore, getFileForDocId(afterDocId, true)); |
Garfield Tan | 75379db | 2017-02-08 15:32:56 -0800 | [diff] [blame] | 189 | |
| 190 | if (!TextUtils.equals(docId, afterDocId)) { |
| 191 | return afterDocId; |
| 192 | } else { |
| 193 | return null; |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | @Override |
Garfield Tan | 75379db | 2017-02-08 15:32:56 -0800 | [diff] [blame] | 198 | public String moveDocument(String sourceDocumentId, String sourceParentDocumentId, |
| 199 | String targetParentDocumentId) |
| 200 | throws FileNotFoundException { |
| 201 | final File before = getFileForDocId(sourceDocumentId); |
| 202 | final File after = new File(getFileForDocId(targetParentDocumentId), before.getName()); |
| 203 | final File visibleFileBefore = getFileForDocId(sourceDocumentId, true); |
| 204 | |
| 205 | if (after.exists()) { |
| 206 | throw new IllegalStateException("Already exists " + after); |
| 207 | } |
| 208 | if (!before.renameTo(after)) { |
| 209 | throw new IllegalStateException("Failed to move to " + after); |
| 210 | } |
| 211 | |
Garfield Tan | 75379db | 2017-02-08 15:32:56 -0800 | [diff] [blame] | 212 | final String docId = getDocIdForFile(after); |
Garfield Tan | 9bd2f6c | 2017-03-10 15:38:15 -0800 | [diff] [blame] | 213 | moveInMediaStore(visibleFileBefore, getFileForDocId(docId, true)); |
Garfield Tan | 75379db | 2017-02-08 15:32:56 -0800 | [diff] [blame] | 214 | |
| 215 | return docId; |
| 216 | } |
| 217 | |
Garfield Tan | d21af53 | 2017-04-17 14:22:32 -0700 | [diff] [blame] | 218 | private void moveInMediaStore(@Nullable File oldVisibleFile, @Nullable File newVisibleFile) { |
| 219 | // visibleFolders are null if we're moving a document in external thumb drive or SD card. |
| 220 | // |
| 221 | // They should be all null or not null at the same time. File#renameTo() doesn't work across |
| 222 | // volumes so an exception will be thrown before calling this method. |
| 223 | if (oldVisibleFile != null && newVisibleFile != null) { |
Garfield Tan | fac8aea | 2017-06-27 11:03:42 -0700 | [diff] [blame] | 224 | final long token = Binder.clearCallingIdentity(); |
Garfield Tan | 9bd2f6c | 2017-03-10 15:38:15 -0800 | [diff] [blame] | 225 | |
Garfield Tan | fac8aea | 2017-06-27 11:03:42 -0700 | [diff] [blame] | 226 | try { |
| 227 | final ContentResolver resolver = getContext().getContentResolver(); |
| 228 | final Uri externalUri = newVisibleFile.isDirectory() |
| 229 | ? MediaStore.Files.getDirectoryUri("external") |
| 230 | : MediaStore.Files.getContentUri("external"); |
Garfield Tan | 9bd2f6c | 2017-03-10 15:38:15 -0800 | [diff] [blame] | 231 | |
Garfield Tan | fac8aea | 2017-06-27 11:03:42 -0700 | [diff] [blame] | 232 | ContentValues values = new ContentValues(); |
| 233 | values.put(MediaStore.Files.FileColumns.DATA, newVisibleFile.getAbsolutePath()); |
| 234 | |
| 235 | // Logic borrowed from MtpDatabase. |
| 236 | // note - we are relying on a special case in MediaProvider.update() to update |
| 237 | // the paths for all children in the case where this is a directory. |
| 238 | final String path = oldVisibleFile.getAbsolutePath(); |
| 239 | resolver.update(externalUri, |
| 240 | values, |
| 241 | "_data LIKE ? AND lower(_data)=lower(?)", |
| 242 | new String[]{path, path}); |
| 243 | } finally { |
| 244 | Binder.restoreCallingIdentity(token); |
| 245 | } |
Garfield Tan | 9bd2f6c | 2017-03-10 15:38:15 -0800 | [diff] [blame] | 246 | } |
| 247 | } |
| 248 | |
| 249 | @Override |
| 250 | public void deleteDocument(String docId) throws FileNotFoundException { |
| 251 | final File file = getFileForDocId(docId); |
| 252 | final File visibleFile = getFileForDocId(docId, true); |
| 253 | |
| 254 | final boolean isDirectory = file.isDirectory(); |
| 255 | if (isDirectory) { |
| 256 | FileUtils.deleteContents(file); |
| 257 | } |
| 258 | if (!file.delete()) { |
| 259 | throw new IllegalStateException("Failed to delete " + file); |
| 260 | } |
| 261 | |
| 262 | removeFromMediaStore(visibleFile, isDirectory); |
| 263 | } |
| 264 | |
Garfield Tan | d21af53 | 2017-04-17 14:22:32 -0700 | [diff] [blame] | 265 | private void removeFromMediaStore(@Nullable File visibleFile, boolean isFolder) |
Garfield Tan | 9bd2f6c | 2017-03-10 15:38:15 -0800 | [diff] [blame] | 266 | throws FileNotFoundException { |
Garfield Tan | d21af53 | 2017-04-17 14:22:32 -0700 | [diff] [blame] | 267 | // visibleFolder is null if we're removing a document from external thumb drive or SD card. |
Garfield Tan | 75379db | 2017-02-08 15:32:56 -0800 | [diff] [blame] | 268 | if (visibleFile != null) { |
Garfield Tan | fac8aea | 2017-06-27 11:03:42 -0700 | [diff] [blame] | 269 | final long token = Binder.clearCallingIdentity(); |
Garfield Tan | 75379db | 2017-02-08 15:32:56 -0800 | [diff] [blame] | 270 | |
Garfield Tan | fac8aea | 2017-06-27 11:03:42 -0700 | [diff] [blame] | 271 | try { |
| 272 | final ContentResolver resolver = getContext().getContentResolver(); |
| 273 | final Uri externalUri = MediaStore.Files.getContentUri("external"); |
| 274 | |
| 275 | // Remove media store entries for any files inside this directory, using |
| 276 | // path prefix match. Logic borrowed from MtpDatabase. |
| 277 | if (isFolder) { |
| 278 | final String path = visibleFile.getAbsolutePath() + "/"; |
| 279 | resolver.delete(externalUri, |
| 280 | "_data LIKE ?1 AND lower(substr(_data,1,?2))=lower(?3)", |
| 281 | new String[]{path + "%", Integer.toString(path.length()), path}); |
| 282 | } |
| 283 | |
| 284 | // Remove media store entry for this exact file. |
| 285 | final String path = visibleFile.getAbsolutePath(); |
Garfield Tan | 75379db | 2017-02-08 15:32:56 -0800 | [diff] [blame] | 286 | resolver.delete(externalUri, |
Garfield Tan | fac8aea | 2017-06-27 11:03:42 -0700 | [diff] [blame] | 287 | "_data LIKE ?1 AND lower(_data)=lower(?2)", |
| 288 | new String[]{path, path}); |
| 289 | } finally { |
| 290 | Binder.restoreCallingIdentity(token); |
Garfield Tan | 75379db | 2017-02-08 15:32:56 -0800 | [diff] [blame] | 291 | } |
Garfield Tan | 75379db | 2017-02-08 15:32:56 -0800 | [diff] [blame] | 292 | } |
| 293 | } |
| 294 | |
| 295 | @Override |
| 296 | public Cursor queryDocument(String documentId, String[] projection) |
| 297 | throws FileNotFoundException { |
| 298 | final MatrixCursor result = new MatrixCursor(resolveProjection(projection)); |
| 299 | includeFile(result, documentId, null); |
| 300 | return result; |
| 301 | } |
| 302 | |
| 303 | @Override |
| 304 | public Cursor queryChildDocuments( |
| 305 | String parentDocumentId, String[] projection, String sortOrder) |
| 306 | throws FileNotFoundException { |
| 307 | |
| 308 | final File parent = getFileForDocId(parentDocumentId); |
| 309 | final MatrixCursor result = new DirectoryCursor( |
| 310 | resolveProjection(projection), parentDocumentId, parent); |
| 311 | for (File file : parent.listFiles()) { |
| 312 | includeFile(result, null, file); |
| 313 | } |
| 314 | return result; |
| 315 | } |
| 316 | |
| 317 | /** |
| 318 | * Searches documents under the given folder. |
| 319 | * |
| 320 | * To avoid runtime explosion only returns the at most 23 items. |
| 321 | * |
| 322 | * @param folder the root folder where recursive search begins |
| 323 | * @param query the search condition used to match file names |
| 324 | * @param projection projection of the returned cursor |
| 325 | * @param exclusion absolute file paths to exclude from result |
| 326 | * @return cursor containing search result |
| 327 | * @throws FileNotFoundException when root folder doesn't exist or search fails |
| 328 | */ |
| 329 | protected final Cursor querySearchDocuments( |
| 330 | File folder, String query, String[] projection, Set<String> exclusion) |
| 331 | throws FileNotFoundException { |
| 332 | |
| 333 | query = query.toLowerCase(); |
| 334 | final MatrixCursor result = new MatrixCursor(resolveProjection(projection)); |
| 335 | final LinkedList<File> pending = new LinkedList<>(); |
| 336 | pending.add(folder); |
| 337 | while (!pending.isEmpty() && result.getCount() < 24) { |
| 338 | final File file = pending.removeFirst(); |
| 339 | if (file.isDirectory()) { |
| 340 | for (File child : file.listFiles()) { |
| 341 | pending.add(child); |
| 342 | } |
| 343 | } |
| 344 | if (file.getName().toLowerCase().contains(query) |
| 345 | && !exclusion.contains(file.getAbsolutePath())) { |
| 346 | includeFile(result, null, file); |
| 347 | } |
| 348 | } |
| 349 | return result; |
| 350 | } |
| 351 | |
| 352 | @Override |
| 353 | public String getDocumentType(String documentId) throws FileNotFoundException { |
| 354 | final File file = getFileForDocId(documentId); |
| 355 | return getTypeForFile(file); |
| 356 | } |
| 357 | |
| 358 | @Override |
| 359 | public ParcelFileDescriptor openDocument( |
| 360 | String documentId, String mode, CancellationSignal signal) |
| 361 | throws FileNotFoundException { |
| 362 | final File file = getFileForDocId(documentId); |
| 363 | final File visibleFile = getFileForDocId(documentId, true); |
| 364 | |
| 365 | final int pfdMode = ParcelFileDescriptor.parseMode(mode); |
| 366 | if (pfdMode == ParcelFileDescriptor.MODE_READ_ONLY || visibleFile == null) { |
| 367 | return ParcelFileDescriptor.open(file, pfdMode); |
| 368 | } else { |
| 369 | try { |
| 370 | // When finished writing, kick off media scanner |
| 371 | return ParcelFileDescriptor.open( |
| 372 | file, pfdMode, mHandler, (IOException e) -> scanFile(visibleFile)); |
| 373 | } catch (IOException e) { |
| 374 | throw new FileNotFoundException("Failed to open for writing: " + e); |
| 375 | } |
| 376 | } |
| 377 | } |
| 378 | |
| 379 | private void scanFile(File visibleFile) { |
| 380 | final Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); |
| 381 | intent.setData(Uri.fromFile(visibleFile)); |
| 382 | getContext().sendBroadcast(intent); |
| 383 | } |
| 384 | |
| 385 | @Override |
| 386 | public AssetFileDescriptor openDocumentThumbnail( |
| 387 | String documentId, Point sizeHint, CancellationSignal signal) |
| 388 | throws FileNotFoundException { |
| 389 | final File file = getFileForDocId(documentId); |
| 390 | return DocumentsContract.openImageThumbnail(file); |
| 391 | } |
| 392 | |
| 393 | protected RowBuilder includeFile(MatrixCursor result, String docId, File file) |
| 394 | throws FileNotFoundException { |
| 395 | if (docId == null) { |
| 396 | docId = getDocIdForFile(file); |
| 397 | } else { |
| 398 | file = getFileForDocId(docId); |
| 399 | } |
| 400 | |
| 401 | int flags = 0; |
| 402 | |
| 403 | if (file.canWrite()) { |
| 404 | if (file.isDirectory()) { |
| 405 | flags |= Document.FLAG_DIR_SUPPORTS_CREATE; |
| 406 | flags |= Document.FLAG_SUPPORTS_DELETE; |
| 407 | flags |= Document.FLAG_SUPPORTS_RENAME; |
| 408 | flags |= Document.FLAG_SUPPORTS_MOVE; |
| 409 | } else { |
| 410 | flags |= Document.FLAG_SUPPORTS_WRITE; |
| 411 | flags |= Document.FLAG_SUPPORTS_DELETE; |
| 412 | flags |= Document.FLAG_SUPPORTS_RENAME; |
| 413 | flags |= Document.FLAG_SUPPORTS_MOVE; |
| 414 | } |
| 415 | } |
| 416 | |
| 417 | final String mimeType = getTypeForFile(file); |
| 418 | final String displayName = file.getName(); |
| 419 | if (mimeType.startsWith("image/")) { |
| 420 | flags |= Document.FLAG_SUPPORTS_THUMBNAIL; |
| 421 | } |
| 422 | |
| 423 | final RowBuilder row = result.newRow(); |
| 424 | row.add(Document.COLUMN_DOCUMENT_ID, docId); |
| 425 | row.add(Document.COLUMN_DISPLAY_NAME, displayName); |
| 426 | row.add(Document.COLUMN_SIZE, file.length()); |
| 427 | row.add(Document.COLUMN_MIME_TYPE, mimeType); |
| 428 | row.add(Document.COLUMN_FLAGS, flags); |
| 429 | |
| 430 | // Only publish dates reasonably after epoch |
| 431 | long lastModified = file.lastModified(); |
| 432 | if (lastModified > 31536000000L) { |
| 433 | row.add(Document.COLUMN_LAST_MODIFIED, lastModified); |
| 434 | } |
| 435 | |
| 436 | // Return the row builder just in case any subclass want to add more stuff to it. |
| 437 | return row; |
| 438 | } |
| 439 | |
| 440 | private static String getTypeForFile(File file) { |
| 441 | if (file.isDirectory()) { |
| 442 | return Document.MIME_TYPE_DIR; |
| 443 | } else { |
| 444 | return getTypeForName(file.getName()); |
| 445 | } |
| 446 | } |
| 447 | |
| 448 | private static String getTypeForName(String name) { |
| 449 | final int lastDot = name.lastIndexOf('.'); |
| 450 | if (lastDot >= 0) { |
| 451 | final String extension = name.substring(lastDot + 1).toLowerCase(); |
| 452 | final String mime = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension); |
| 453 | if (mime != null) { |
| 454 | return mime; |
| 455 | } |
| 456 | } |
| 457 | |
| 458 | return "application/octet-stream"; |
| 459 | } |
| 460 | |
| 461 | protected final File getFileForDocId(String docId) throws FileNotFoundException { |
| 462 | return getFileForDocId(docId, false); |
| 463 | } |
| 464 | |
| 465 | private String[] resolveProjection(String[] projection) { |
| 466 | return projection == null ? mDefaultProjection : projection; |
| 467 | } |
| 468 | |
| 469 | private void startObserving(File file, Uri notifyUri) { |
| 470 | synchronized (mObservers) { |
| 471 | DirectoryObserver observer = mObservers.get(file); |
| 472 | if (observer == null) { |
| 473 | observer = new DirectoryObserver( |
| 474 | file, getContext().getContentResolver(), notifyUri); |
| 475 | observer.startWatching(); |
| 476 | mObservers.put(file, observer); |
| 477 | } |
| 478 | observer.mRefCount++; |
| 479 | |
| 480 | if (LOG_INOTIFY) Log.d(TAG, "after start: " + observer); |
| 481 | } |
| 482 | } |
| 483 | |
| 484 | private void stopObserving(File file) { |
| 485 | synchronized (mObservers) { |
| 486 | DirectoryObserver observer = mObservers.get(file); |
| 487 | if (observer == null) return; |
| 488 | |
| 489 | observer.mRefCount--; |
| 490 | if (observer.mRefCount == 0) { |
| 491 | mObservers.remove(file); |
| 492 | observer.stopWatching(); |
| 493 | } |
| 494 | |
| 495 | if (LOG_INOTIFY) Log.d(TAG, "after stop: " + observer); |
| 496 | } |
| 497 | } |
| 498 | |
| 499 | private static class DirectoryObserver extends FileObserver { |
| 500 | private static final int NOTIFY_EVENTS = ATTRIB | CLOSE_WRITE | MOVED_FROM | MOVED_TO |
| 501 | | CREATE | DELETE | DELETE_SELF | MOVE_SELF; |
| 502 | |
| 503 | private final File mFile; |
| 504 | private final ContentResolver mResolver; |
| 505 | private final Uri mNotifyUri; |
| 506 | |
| 507 | private int mRefCount = 0; |
| 508 | |
| 509 | public DirectoryObserver(File file, ContentResolver resolver, Uri notifyUri) { |
| 510 | super(file.getAbsolutePath(), NOTIFY_EVENTS); |
| 511 | mFile = file; |
| 512 | mResolver = resolver; |
| 513 | mNotifyUri = notifyUri; |
| 514 | } |
| 515 | |
| 516 | @Override |
| 517 | public void onEvent(int event, String path) { |
| 518 | if ((event & NOTIFY_EVENTS) != 0) { |
| 519 | if (LOG_INOTIFY) Log.d(TAG, "onEvent() " + event + " at " + path); |
| 520 | mResolver.notifyChange(mNotifyUri, null, false); |
| 521 | } |
| 522 | } |
| 523 | |
| 524 | @Override |
| 525 | public String toString() { |
| 526 | return "DirectoryObserver{file=" + mFile.getAbsolutePath() + ", ref=" + mRefCount + "}"; |
| 527 | } |
| 528 | } |
| 529 | |
| 530 | private class DirectoryCursor extends MatrixCursor { |
| 531 | private final File mFile; |
| 532 | |
| 533 | public DirectoryCursor(String[] columnNames, String docId, File file) { |
| 534 | super(columnNames); |
| 535 | |
| 536 | final Uri notifyUri = buildNotificationUri(docId); |
| 537 | setNotificationUri(getContext().getContentResolver(), notifyUri); |
| 538 | |
| 539 | mFile = file; |
| 540 | startObserving(mFile, notifyUri); |
| 541 | } |
| 542 | |
| 543 | @Override |
| 544 | public void close() { |
| 545 | super.close(); |
| 546 | stopObserving(mFile); |
| 547 | } |
| 548 | } |
| 549 | } |