| /* |
| * Copyright (C) 2019 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.textclassifier.ulp.database; |
| |
| import android.content.Context; |
| |
| import androidx.annotation.GuardedBy; |
| import androidx.room.Database; |
| import androidx.room.Room; |
| import androidx.room.RoomDatabase; |
| |
| /** |
| * Represents user language profile database. |
| * |
| * <p>Needed for Room database to work. Allows to create a database instance (or get an already |
| * existing if there is one) and use it. |
| */ |
| @Database( |
| entities = {LanguageSignalInfo.class}, |
| version = 1, |
| exportSchema = false) |
| public abstract class LanguageProfileDatabase extends RoomDatabase { |
| private static final Object sLock = new Object(); |
| |
| @GuardedBy("sLock") |
| private static LanguageProfileDatabase sINSTANCE; |
| |
| /** |
| * Returns {@link LanguageSignalInfoDao} object belonging to the {@link LanguageProfileDatabase} |
| * with which we can call database queries. |
| */ |
| public abstract LanguageSignalInfoDao languageInfoDao(); |
| |
| /** |
| * Create an instance of {@link LanguageProfileDatabase} for chosen context or existing one if |
| * it was already created. |
| */ |
| public static LanguageProfileDatabase getInstance(final Context context) { |
| synchronized (sLock) { |
| if (sINSTANCE == null) { |
| sINSTANCE = |
| Room.databaseBuilder( |
| context.getApplicationContext(), |
| LanguageProfileDatabase.class, |
| "language_profile") |
| .build(); |
| } |
| return sINSTANCE; |
| } |
| } |
| } |