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      1 /*
      2  * Copyright (C) 2014 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 android.support.v4.provider;
     18 
     19 import android.content.ContentResolver;
     20 import android.content.Context;
     21 import android.database.Cursor;
     22 import android.net.Uri;
     23 import android.provider.DocumentsContract;
     24 import android.util.Log;
     25 
     26 import java.util.ArrayList;
     27 
     28 class DocumentsContractApi21 {
     29     private static final String TAG = "DocumentFile";
     30 
     31     public static Uri createFile(Context context, Uri self, String mimeType,
     32             String displayName) {
     33         return DocumentsContract.createDocument(context.getContentResolver(), self, mimeType,
     34                 displayName);
     35     }
     36 
     37     public static Uri createDirectory(Context context, Uri self, String displayName) {
     38         return createFile(context, self, DocumentsContract.Document.MIME_TYPE_DIR, displayName);
     39     }
     40 
     41     public static Uri prepareTreeUri(Uri treeUri) {
     42         return DocumentsContract.buildDocumentUriUsingTree(treeUri,
     43                 DocumentsContract.getTreeDocumentId(treeUri));
     44     }
     45 
     46     public static Uri[] listFiles(Context context, Uri self) {
     47         final ContentResolver resolver = context.getContentResolver();
     48         final Uri childrenUri = DocumentsContract.buildChildDocumentsUriUsingTree(self,
     49                 DocumentsContract.getDocumentId(self));
     50         final ArrayList<Uri> results = new ArrayList<Uri>();
     51 
     52         Cursor c = null;
     53         try {
     54             c = resolver.query(childrenUri, new String[] {
     55                     DocumentsContract.Document.COLUMN_DOCUMENT_ID }, null, null, null);
     56             while (c.moveToNext()) {
     57                 final String documentId = c.getString(0);
     58                 final Uri documentUri = DocumentsContract.buildDocumentUriUsingTree(self,
     59                         documentId);
     60                 results.add(documentUri);
     61             }
     62         } catch (Exception e) {
     63             Log.w(TAG, "Failed query: " + e);
     64         } finally {
     65             closeQuietly(c);
     66         }
     67 
     68         return results.toArray(new Uri[results.size()]);
     69     }
     70 
     71     public static Uri renameTo(Context context, Uri self, String displayName) {
     72         return DocumentsContract.renameDocument(context.getContentResolver(), self, displayName);
     73     }
     74 
     75     private static void closeQuietly(AutoCloseable closeable) {
     76         if (closeable != null) {
     77             try {
     78                 closeable.close();
     79             } catch (RuntimeException rethrown) {
     80                 throw rethrown;
     81             } catch (Exception ignored) {
     82             }
     83         }
     84     }
     85 }
     86