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/*
* 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 android.arch.persistence.room.integration.testapp;
import android.app.Application;
import android.arch.core.executor.AppToolkitTaskExecutor;
import android.arch.lifecycle.AndroidViewModel;
import android.arch.lifecycle.LiveData;
import android.arch.paging.DataSource;
import android.arch.paging.LivePagedListProvider;
import android.arch.paging.PagedList;
import android.arch.persistence.room.Room;
import android.arch.persistence.room.integration.testapp.database.Customer;
import android.arch.persistence.room.integration.testapp.database.LastNameAscCustomerDataSource;
import android.arch.persistence.room.integration.testapp.database.SampleDatabase;
import android.support.annotation.WorkerThread;
import java.util.UUID;
/**
* Sample database-backed view model of Customers
*/
public class CustomerViewModel extends AndroidViewModel {
private SampleDatabase mDatabase;
private LiveData<PagedList<Customer>> mLiveCustomerList;
public CustomerViewModel(Application application) {
super(application);
createDb();
}
private void createDb() {
mDatabase = Room.databaseBuilder(this.getApplication(),
SampleDatabase.class, "customerDatabase").build();
AppToolkitTaskExecutor.getInstance().executeOnDiskIO(new Runnable() {
@Override
public void run() {
// fill with some simple data
int customerCount = mDatabase.getCustomerDao().countCustomers();
if (customerCount == 0) {
Customer[] initialCustomers = new Customer[10];
for (int i = 0; i < 10; i++) {
initialCustomers[i] = createCustomer();
}
mDatabase.getCustomerDao().insertAll(initialCustomers);
}
}
});
}
@WorkerThread
private Customer createCustomer() {
Customer customer = new Customer();
customer.setName(UUID.randomUUID().toString());
customer.setLastName(UUID.randomUUID().toString());
return customer;
}
void insertCustomer() {
AppToolkitTaskExecutor.getInstance().executeOnDiskIO(new Runnable() {
@Override
public void run() {
mDatabase.getCustomerDao().insert(createCustomer());
}
});
}
LiveData<PagedList<Customer>> getLivePagedList(int position) {
if (mLiveCustomerList == null) {
mLiveCustomerList = mDatabase.getCustomerDao()
.loadPagedAgeOrder().create(position,
new PagedList.Config.Builder()
.setPageSize(10)
.setEnablePlaceholders(false)
.build());
}
return mLiveCustomerList;
}
LiveData<PagedList<Customer>> getLivePagedList(String key) {
if (mLiveCustomerList == null) {
mLiveCustomerList = new LivePagedListProvider<String, Customer>() {
@Override
protected DataSource<String, Customer> createDataSource() {
return new LastNameAscCustomerDataSource(mDatabase);
}
}.create(key,
new PagedList.Config.Builder()
.setPageSize(10)
.setEnablePlaceholders(false)
.build());
}
return mLiveCustomerList;
}
}
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