1 files changed, 95 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/database/ExoDatabaseProvider.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/database/ExoDatabaseProvider.java
new file mode 100644
index 0000000000..037442b102
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/database/ExoDatabaseProvider.java
@@ -0,0 +1,95 @@
+/*
+ * 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 org.mozilla.thirdparty.com.google.android.exoplayer2.database;
+
+import android.content.Context;
+import android.database.Cursor;
+import android.database.SQLException;
+import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteOpenHelper;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Log;
+
+/**
+ * An {@link SQLiteOpenHelper} that provides instances of a standalone ExoPlayer database.
+ *
+ * <p>Suitable for use by applications that do not already have their own database, or that would
+ * prefer to keep ExoPlayer tables isolated in their own database. Other applications should prefer
+ * to use {@link DefaultDatabaseProvider} with their own {@link SQLiteOpenHelper}.
+ */
+public final class ExoDatabaseProvider extends SQLiteOpenHelper implements DatabaseProvider {
+
+  /** The file name used for the standalone ExoPlayer database. */
+  public static final String DATABASE_NAME = "exoplayer_internal.db";
+
+  private static final int VERSION = 1;
+  private static final String TAG = "ExoDatabaseProvider";
+
+  /**
+   * Provides instances of the database located by passing {@link #DATABASE_NAME} to {@link
+   * Context#getDatabasePath(String)}.
+   *
+   * @param context Any context.
+   */
+  public ExoDatabaseProvider(Context context) {
+    super(context.getApplicationContext(), DATABASE_NAME, /* factory= */ null, VERSION);
+  }
+
+  @Override
+  public void onCreate(SQLiteDatabase db) {
+    // Features create their own tables.
+  }
+
+  @Override
+  public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
+    // Features handle their own upgrades.
+  }
+
+  @Override
+  public void onDowngrade(SQLiteDatabase db, int oldVersion, int newVersion) {
+    wipeDatabase(db);
+  }
+
+  /**
+   * Makes a best effort to wipe the existing database. The wipe may be incomplete if the database
+   * contains foreign key constraints.
+   */
+  private static void wipeDatabase(SQLiteDatabase db) {
+    String[] columns = {"type", "name"};
+    try (Cursor cursor =
+        db.query(
+            "sqlite_master",
+            columns,
+            /* selection= */ null,
+            /* selectionArgs= */ null,
+            /* groupBy= */ null,
+            /* having= */ null,
+            /* orderBy= */ null)) {
+      while (cursor.moveToNext()) {
+        String type = cursor.getString(0);
+        String name = cursor.getString(1);
+        if (!"sqlite_sequence".equals(name)) {
+          // If it's not an SQL-controlled entity, drop it
+          String sql = "DROP " + type + " IF EXISTS " + name;
+          try {
+            db.execSQL(sql);
+          } catch (SQLException e) {
+            Log.e(TAG, "Error executing " + sql, e);
+          }
+        }
+      }
+    }
+  }
+}