content: /*
   * Copyright (C) 2017 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.example.android.autofill.service.data.source.local.db;
  
  import android.arch.persistence.db.SupportSQLiteDatabase;
  import android.arch.persistence.room.Database;
  import android.arch.persistence.room.Room;
  import android.arch.persistence.room.RoomDatabase;
  import android.arch.persistence.room.TypeConverters;
  import android.content.Context;
  import android.support.annotation.NonNull;
  
  import com.example.android.autofill.service.data.source.DefaultFieldTypesSource;
  import com.example.android.autofill.service.data.source.local.dao.AutofillDao;
  import com.example.android.autofill.service.model.AutofillDataset;
  import com.example.android.autofill.service.model.AutofillHint;
  import com.example.android.autofill.service.model.DefaultFieldTypeWithHints;
  import com.example.android.autofill.service.model.FakeData;
  import com.example.android.autofill.service.model.FieldType;
  import com.example.android.autofill.service.model.FilledAutofillField;
  import com.example.android.autofill.service.model.ResourceIdHeuristic;
  import com.example.android.autofill.service.util.AppExecutors;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import static com.example.android.autofill.service.data.source.local.db.Converters.IntList;
  import static java.util.stream.Collectors.toList;
  
  @Database(entities = {
          FilledAutofillField.class,
          AutofillDataset.class,
          FieldType.class,
          AutofillHint.class,
          ResourceIdHeuristic.class
  }, version = 1)
  @TypeConverters({Converters.class})
  public abstract class AutofillDatabase extends RoomDatabase {
  
      private static final Object sLock = new Object();
      private static AutofillDatabase sInstance;
  
      public static AutofillDatabase getInstance(Context context,
              DefaultFieldTypesSource defaultFieldTypesSource,
              AppExecutors appExecutors) {
          if (sInstance == null) {
              synchronized (sLock) {
                  if (sInstance == null) {
                      sInstance = Room.databaseBuilder(context.getApplicationContext(),
                              AutofillDatabase.class, "AutofillSample.db")
                              .addCallback(new RoomDatabase.Callback() {
                                  @Override
                                  public void onCreate(@NonNull SupportSQLiteDatabase db) {
                                      appExecutors.diskIO().execute(() -> {
                                          List<DefaultFieldTypeWithHints> fieldTypes =
                                                  defaultFieldTypesSource.getDefaultFieldTypes();
                                          AutofillDatabase autofillDatabase =
                                                  getInstance(context, defaultFieldTypesSource,
                                                          appExecutors);
                                          autofillDatabase.saveDefaultFieldTypes(fieldTypes);
                                      });
                                  }
  
                                  @Override
                                  public void onOpen(@NonNull SupportSQLiteDatabase db) {
                                      super.onOpen(db);
                                  }
                              })
                              .build();
                  }
              }
          }
          return sInstance;
      }
  
      private void saveDefaultFieldTypes(List<DefaultFieldTypeWithHints> defaultFieldTypes) {
          List<FieldType> storedFieldTypes = new ArrayList<>();
          List<AutofillHint> storedAutofillHints = new ArrayList<>();
          for (DefaultFieldTypeWithHints defaultType : defaultFieldTypes) {
              DefaultFieldTypeWithHints.DefaultFieldType defaultFieldType = defaultType.fieldType;
              List<String> autofillHints = defaultType.autofillHints;
              IntList autofillTypes = new IntList(defaultFieldType.autofillTypes);
              DefaultFieldTypeWithHints.DefaultFakeData defaultFakeData = defaultType.fieldType.fakeData;
              FakeData fakeData = new FakeData(new Converters.StringList(
                      defaultFakeData.strictExampleSet), defaultFakeData.textTemplate,
                      defaultFakeData.dateTemplate);
              FieldType storedFieldType = new FieldType(defaultFieldType.typeName, autofillTypes,
                      defaultFieldType.saveInfo, defaultFieldType.partition, fakeData);
              storedFieldTypes.add(storedFieldType);
              storedAutofillHints.addAll(autofillHints.stream()
                      .map((autofillHint) -> new AutofillHint(autofillHint,
                              storedFieldType.getTypeName())).collect(toList()));
          }
          AutofillDao autofillDao = autofillDao();
          autofillDao.insertFieldTypes(storedFieldTypes);
          autofillDao.insertAutofillHints(storedAutofillHints);
      }
  
      public abstract AutofillDao autofillDao();
  }