| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.support.v4.provider; |
| |
| import android.content.ContentResolver; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.pm.PackageManager; |
| import android.database.Cursor; |
| import android.net.Uri; |
| import android.provider.DocumentsContract; |
| import android.text.TextUtils; |
| import android.util.Log; |
| |
| class DocumentsContractApi19 { |
| private static final String TAG = "DocumentFile"; |
| |
| public static boolean isDocumentUri(Context context, Uri self) { |
| return DocumentsContract.isDocumentUri(context, self); |
| } |
| |
| public static String getName(Context context, Uri self) { |
| return queryForString(context, self, DocumentsContract.Document.COLUMN_DISPLAY_NAME, null); |
| } |
| |
| private static String getRawType(Context context, Uri self) { |
| return queryForString(context, self, DocumentsContract.Document.COLUMN_MIME_TYPE, null); |
| } |
| |
| public static String getType(Context context, Uri self) { |
| final String rawType = getRawType(context, self); |
| if (DocumentsContract.Document.MIME_TYPE_DIR.equals(rawType)) { |
| return null; |
| } else { |
| return rawType; |
| } |
| } |
| |
| public static boolean isDirectory(Context context, Uri self) { |
| return DocumentsContract.Document.MIME_TYPE_DIR.equals(getRawType(context, self)); |
| } |
| |
| public static boolean isFile(Context context, Uri self) { |
| final String type = getRawType(context, self); |
| if (DocumentsContract.Document.MIME_TYPE_DIR.equals(type) || TextUtils.isEmpty(type)) { |
| return false; |
| } else { |
| return true; |
| } |
| } |
| |
| public static long lastModified(Context context, Uri self) { |
| return queryForLong(context, self, DocumentsContract.Document.COLUMN_LAST_MODIFIED, 0); |
| } |
| |
| public static long length(Context context, Uri self) { |
| return queryForLong(context, self, DocumentsContract.Document.COLUMN_SIZE, 0); |
| } |
| |
| public static boolean canRead(Context context, Uri self) { |
| // Ignore if grant doesn't allow read |
| if (context.checkCallingOrSelfUriPermission(self, Intent.FLAG_GRANT_READ_URI_PERMISSION) |
| != PackageManager.PERMISSION_GRANTED) { |
| return false; |
| } |
| |
| // Ignore documents without MIME |
| if (TextUtils.isEmpty(getRawType(context, self))) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| public static boolean canWrite(Context context, Uri self) { |
| // Ignore if grant doesn't allow write |
| if (context.checkCallingOrSelfUriPermission(self, Intent.FLAG_GRANT_WRITE_URI_PERMISSION) |
| != PackageManager.PERMISSION_GRANTED) { |
| return false; |
| } |
| |
| final String type = getRawType(context, self); |
| final int flags = queryForInt(context, self, DocumentsContract.Document.COLUMN_FLAGS, 0); |
| |
| // Ignore documents without MIME |
| if (TextUtils.isEmpty(type)) { |
| return false; |
| } |
| |
| // Deletable documents considered writable |
| if ((flags & DocumentsContract.Document.FLAG_SUPPORTS_DELETE) != 0) { |
| return true; |
| } |
| |
| if (DocumentsContract.Document.MIME_TYPE_DIR.equals(type) |
| && (flags & DocumentsContract.Document.FLAG_DIR_SUPPORTS_CREATE) != 0) { |
| // Directories that allow create considered writable |
| return true; |
| } else if (!TextUtils.isEmpty(type) |
| && (flags & DocumentsContract.Document.FLAG_SUPPORTS_WRITE) != 0) { |
| // Writable normal files considered writable |
| return true; |
| } |
| |
| return false; |
| } |
| |
| public static boolean delete(Context context, Uri self) { |
| return DocumentsContract.deleteDocument(context.getContentResolver(), self); |
| } |
| |
| public static boolean exists(Context context, Uri self) { |
| final ContentResolver resolver = context.getContentResolver(); |
| |
| Cursor c = null; |
| try { |
| c = resolver.query(self, new String[] { |
| DocumentsContract.Document.COLUMN_DOCUMENT_ID }, null, null, null); |
| return c.getCount() > 0; |
| } catch (Exception e) { |
| Log.w(TAG, "Failed query: " + e); |
| return false; |
| } finally { |
| closeQuietly(c); |
| } |
| } |
| |
| private static String queryForString(Context context, Uri self, String column, |
| String defaultValue) { |
| final ContentResolver resolver = context.getContentResolver(); |
| |
| Cursor c = null; |
| try { |
| c = resolver.query(self, new String[] { column }, null, null, null); |
| if (c.moveToFirst() && !c.isNull(0)) { |
| return c.getString(0); |
| } else { |
| return defaultValue; |
| } |
| } catch (Exception e) { |
| Log.w(TAG, "Failed query: " + e); |
| return defaultValue; |
| } finally { |
| closeQuietly(c); |
| } |
| } |
| |
| private static int queryForInt(Context context, Uri self, String column, |
| int defaultValue) { |
| return (int) queryForLong(context, self, column, defaultValue); |
| } |
| |
| private static long queryForLong(Context context, Uri self, String column, |
| long defaultValue) { |
| final ContentResolver resolver = context.getContentResolver(); |
| |
| Cursor c = null; |
| try { |
| c = resolver.query(self, new String[] { column }, null, null, null); |
| if (c.moveToFirst() && !c.isNull(0)) { |
| return c.getLong(0); |
| } else { |
| return defaultValue; |
| } |
| } catch (Exception e) { |
| Log.w(TAG, "Failed query: " + e); |
| return defaultValue; |
| } finally { |
| closeQuietly(c); |
| } |
| } |
| |
| private static void closeQuietly(AutoCloseable closeable) { |
| if (closeable != null) { |
| try { |
| closeable.close(); |
| } catch (RuntimeException rethrown) { |
| throw rethrown; |
| } catch (Exception ignored) { |
| } |
| } |
| } |
| } |