content: /*
   * Copyright (C) 2018 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 com.android.server.backup.encryption.storage;
  
  import android.content.Context;
  
  /**
   * Backup encryption SQLite database. All instances are threadsafe.
   *
   * <p>The database is automatically opened when accessing one of the tables. After the caller is
   * done they must call {@link #close()}.
   */
  public class BackupEncryptionDb {
      private final BackupEncryptionDbHelper mHelper;
  
      /** A new instance, using the storage defined by {@code context}. */
      public static BackupEncryptionDb newInstance(Context context) {
          BackupEncryptionDbHelper helper = new BackupEncryptionDbHelper(context);
          helper.setWriteAheadLoggingEnabled(true);
          return new BackupEncryptionDb(helper);
      }
  
      private BackupEncryptionDb(BackupEncryptionDbHelper helper) {
          mHelper = helper;
      }
  
      public TertiaryKeysTable getTertiaryKeysTable() {
          return new TertiaryKeysTable(mHelper);
      }
  
      /** Deletes the database. */
      public void clear() throws EncryptionDbException {
          mHelper.resetDatabase();
      }
  
      /**
       * Closes the database if it is open.
       *
       * <p>After calling this, the caller may access one of the tables again which will automatically
       * reopen the database.
       */
      public void close() {
          mHelper.close();
      }
  }
  