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PodcastStore.kt
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PodcastStore.kt
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/*
* Copyright 2020 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
*
* https://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.jetcaster.data
import com.example.jetcaster.data.room.PodcastFollowedEntryDao
import com.example.jetcaster.data.room.PodcastsDao
import com.example.jetcaster.data.room.TransactionRunner
import kotlinx.coroutines.flow.Flow
/**
* A data repository for [Podcast] instances.
*/
class PodcastStore(
private val podcastDao: PodcastsDao,
private val podcastFollowedEntryDao: PodcastFollowedEntryDao,
private val transactionRunner: TransactionRunner
) {
/**
* Return a flow containing the [Podcast] with the given [uri].
*/
fun podcastWithUri(uri: String): Flow<Podcast> {
return podcastDao.podcastWithUri(uri)
}
/**
* Returns a flow containing the entire collection of podcasts, sorted by the last episode
* publish date for each podcast.
*/
fun podcastsSortedByLastEpisode(
limit: Int = Int.MAX_VALUE
): Flow<List<PodcastWithExtraInfo>> {
return podcastDao.podcastsSortedByLastEpisode(limit)
}
/**
* Returns a flow containing a list of all followed podcasts, sorted by the their last
* episode date.
*/
fun followedPodcastsSortedByLastEpisode(
limit: Int = Int.MAX_VALUE
): Flow<List<PodcastWithExtraInfo>> {
return podcastDao.followedPodcastsSortedByLastEpisode(limit)
}
private suspend fun followPodcast(podcastUri: String) {
podcastFollowedEntryDao.insert(PodcastFollowedEntry(podcastUri = podcastUri))
}
suspend fun togglePodcastFollowed(podcastUri: String) = transactionRunner {
if (podcastFollowedEntryDao.isPodcastFollowed(podcastUri)) {
unfollowPodcast(podcastUri)
} else {
followPodcast(podcastUri)
}
}
suspend fun unfollowPodcast(podcastUri: String) {
podcastFollowedEntryDao.deleteWithPodcastUri(podcastUri)
}
/**
* Add a new [Podcast] to this store.
*
* This automatically switches to the main thread to maintain thread consistency.
*/
suspend fun addPodcast(podcast: Podcast) {
podcastDao.insert(podcast)
}
suspend fun isEmpty(): Boolean = podcastDao.count() == 0
}