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/*
* Copyright 2016 lizhaotailang
*
* 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.marktony.zhihudaily.data.source.local
import android.support.annotation.VisibleForTesting
import com.marktony.zhihudaily.data.ZhihuDailyNewsQuestion
import com.marktony.zhihudaily.data.source.LocalDataNotFoundException
import com.marktony.zhihudaily.data.source.Result
import com.marktony.zhihudaily.data.source.datasource.ZhihuDailyNewsDataSource
import com.marktony.zhihudaily.database.dao.ZhihuDailyNewsDao
import com.marktony.zhihudaily.util.AppExecutors
import kotlinx.coroutines.experimental.withContext
/**
* Created by lizhaotailang on 2017/5/21.
*
* Concrete implementation of a [ZhihuDailyNewsQuestion] data source as database.
*/
class ZhihuDailyNewsLocalDataSource private constructor(
val mAppExecutors: AppExecutors,
val mZhihuDailyNewsDao: ZhihuDailyNewsDao
) : ZhihuDailyNewsDataSource {
companion object {
private var INSTANCE: ZhihuDailyNewsLocalDataSource? = null
@JvmStatic
fun getInstance(appExecutors: AppExecutors, zhihuDailyNewsDao: ZhihuDailyNewsDao): ZhihuDailyNewsLocalDataSource {
if (INSTANCE == null) {
synchronized(ZhihuDailyNewsLocalDataSource::javaClass) {
INSTANCE = ZhihuDailyNewsLocalDataSource(appExecutors, zhihuDailyNewsDao)
}
}
return INSTANCE!!
}
@VisibleForTesting
fun clearInstance() {
INSTANCE = null
}
}
override suspend fun getZhihuDailyNews(forceUpdate: Boolean, clearCache: Boolean, date: Long): Result<List<ZhihuDailyNewsQuestion>> = withContext(mAppExecutors.ioContext) {
val news = mZhihuDailyNewsDao.queryAllByDate(date)
if (news.isNotEmpty()) Result.Success(news) else Result.Error(LocalDataNotFoundException())
}
override suspend fun getFavorites(): Result<List<ZhihuDailyNewsQuestion>> = withContext(mAppExecutors.ioContext) {
val favorites = mZhihuDailyNewsDao.queryAllFavorites()
if (favorites.isNotEmpty()) Result.Success(favorites) else Result.Error(LocalDataNotFoundException())
}
override suspend fun getItem(itemId: Int): Result<ZhihuDailyNewsQuestion> = withContext(mAppExecutors.ioContext) {
val item = mZhihuDailyNewsDao.queryItemById(itemId)
if (item != null) Result.Success(item) else Result.Error(LocalDataNotFoundException())
}
override suspend fun favoriteItem(itemId: Int, favorite: Boolean) {
withContext(mAppExecutors.ioContext) {
mZhihuDailyNewsDao.queryItemById(itemId)?.let {
it.isFavorite = favorite
mZhihuDailyNewsDao.update(it)
}
}
}
override suspend fun saveAll(list: List<ZhihuDailyNewsQuestion>) {
withContext(mAppExecutors.ioContext) {
mZhihuDailyNewsDao.insertAll(list)
}
}
}