76 lines
2.7 KiB
Kotlin
76 lines
2.7 KiB
Kotlin
/*
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* Copyright (C) 2020 Conny Duck
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*
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* This file is part of Pixelcat.
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*
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* Pixelcat is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Pixelcat is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package at.connyduck.pixelcat.components.timeline
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import android.util.Log
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import androidx.paging.ExperimentalPagingApi
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import androidx.paging.LoadType
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import androidx.paging.PagingState
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import androidx.paging.RemoteMediator
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import androidx.room.withTransaction
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import at.connyduck.pixelcat.db.AppDatabase
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import at.connyduck.pixelcat.db.entitity.StatusEntity
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import at.connyduck.pixelcat.db.entitity.toEntity
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import at.connyduck.pixelcat.network.FediverseApi
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@ExperimentalPagingApi
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class TimelineRemoteMediator(
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private val accountId: Long,
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private val api: FediverseApi,
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private val db: AppDatabase
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) : RemoteMediator<Int, StatusEntity>() {
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override suspend fun load(
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loadType: LoadType,
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state: PagingState<Int, StatusEntity>
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): MediatorResult {
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val apiCall = when (loadType) {
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LoadType.REFRESH -> {
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api.homeTimeline(limit = state.config.initialLoadSize)
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}
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LoadType.PREPEND -> {
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return MediatorResult.Success(true)
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}
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LoadType.APPEND -> {
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val maxId = state.pages.findLast { it.data.isNotEmpty() }?.data?.lastOrNull()?.id
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Log.w("TimelineRemoteMediator", "anchorPosition: ${state.anchorPosition} maxId: $maxId")
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api.homeTimeline(maxId = maxId, limit = state.config.pageSize)
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}
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}
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return apiCall.fold(
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{ statusResult ->
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db.withTransaction {
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if (loadType == LoadType.REFRESH) {
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db.statusDao().clearAll(accountId)
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}
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db.statusDao().insertOrReplace(statusResult.map { it.toEntity(accountId) })
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}
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MediatorResult.Success(endOfPaginationReached = statusResult.isEmpty())
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},
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{
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MediatorResult.Error(it)
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}
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)
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}
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override suspend fun initialize() = InitializeAction.SKIP_INITIAL_REFRESH
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}
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