content: /*
   * 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.provider;
  
  import android.annotation.TargetApi;
  import android.content.ContentResolver;
  import android.content.Context;
  import android.database.Cursor;
  import android.net.Uri;
  import android.provider.DocumentsContract;
  import androidx.annotation.RequiresApi;
  import android.util.Log;
  
  import java.io.FileNotFoundException;
  import java.util.ArrayList;
  
  @RequiresApi(21)
  @TargetApi(21)
  class DocumentsContractApi21 {
      private static final String TAG = "DocumentFile";
  
      public static Uri createFile(Context context, Uri self, String mimeType,
              String displayName) {
          try {
              return DocumentsContract.createDocument(context.getContentResolver(), self, mimeType,
                      displayName);
          } catch (FileNotFoundException e) {
              e.printStackTrace();
              return null;
          }
      }
  
      public static Uri createDirectory(Context context, Uri self, String displayName) {
          return createFile(context, self, DocumentsContract.Document.MIME_TYPE_DIR, displayName);
      }
  
      public static Uri prepareTreeUri(Uri treeUri) {
          return DocumentsContract.buildDocumentUriUsingTree(treeUri,
                  DocumentsContract.getTreeDocumentId(treeUri));
      }
  
      public static Uri[] listFiles(Context context, Uri self) {
          final ContentResolver resolver = context.getContentResolver();
          final Uri childrenUri = DocumentsContract.buildChildDocumentsUriUsingTree(self,
                  DocumentsContract.getDocumentId(self));
          final ArrayList<Uri> results = new ArrayList<Uri>();
  
          Cursor c = null;
          try {
              c = resolver.query(childrenUri, new String[] {
                      DocumentsContract.Document.COLUMN_DOCUMENT_ID }, null, null, null);
              while (c.moveToNext()) {
                  final String documentId = c.getString(0);
                  final Uri documentUri = DocumentsContract.buildDocumentUriUsingTree(self,
                          documentId);
                  results.add(documentUri);
              }
          } catch (Exception e) {
              Log.w(TAG, "Failed query: " + e);
          } finally {
              closeQuietly(c);
          }
  
          return results.toArray(new Uri[results.size()]);
      }
  
      public static Uri renameTo(Context context, Uri self, String displayName) {
          try {
              return DocumentsContract.renameDocument(context.getContentResolver(), self, displayName);
          } catch (FileNotFoundException e) {
              e.printStackTrace();
              return null;
          }
      }
  
      private static void closeQuietly(AutoCloseable closeable) {
          if (closeable != null) {
              try {
                  closeable.close();
              } catch (RuntimeException rethrown) {
                  throw rethrown;
              } catch (Exception ignored) {
              }
          }
      }
  }
  