89 lines
3.2 KiB
Kotlin
89 lines
3.2 KiB
Kotlin
/* Copyright 2021 Tusky Contributors
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*
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* This file is a part of Tusky.
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*
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* This program is free software; you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation; either version 3 of the
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* License, or (at your option) any later version.
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*
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* Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
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* the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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* 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 along with Tusky; if not,
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* see <http://www.gnu.org/licenses>. */
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package com.keylesspalace.tusky.components.report.adapter
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import android.util.Log
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import androidx.paging.PagingSource
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import androidx.paging.PagingState
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import com.keylesspalace.tusky.entity.Status
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import com.keylesspalace.tusky.network.MastodonApi
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.async
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import kotlinx.coroutines.rx3.await
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import kotlinx.coroutines.withContext
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class StatusesPagingSource(
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private val accountId: String,
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private val mastodonApi: MastodonApi
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) : PagingSource<String, Status>() {
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override fun getRefreshKey(state: PagingState<String, Status>): String? {
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return state.anchorPosition?.let { anchorPosition ->
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state.closestItemToPosition(anchorPosition)?.id
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}
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}
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override suspend fun load(params: LoadParams<String>): LoadResult<String, Status> {
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val key = params.key
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try {
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val result = if (params is LoadParams.Refresh && key != null) {
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withContext(Dispatchers.IO) {
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val initialStatus = async { getSingleStatus(key) }
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val additionalStatuses = async { getStatusList(maxId = key, limit = params.loadSize - 1) }
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listOf(initialStatus.await()) + additionalStatuses.await()
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}
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} else {
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val maxId = if (params is LoadParams.Refresh || params is LoadParams.Append) {
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params.key
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} else {
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null
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}
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val minId = if (params is LoadParams.Prepend) {
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params.key
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} else {
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null
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}
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getStatusList(minId = minId, maxId = maxId, limit = params.loadSize)
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}
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return LoadResult.Page(
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data = result,
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prevKey = result.firstOrNull()?.id,
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nextKey = result.lastOrNull()?.id
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)
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} catch (e: Exception) {
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Log.w("StatusesPagingSource", "failed to load statuses", e)
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return LoadResult.Error(e)
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}
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}
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private suspend fun getSingleStatus(statusId: String): Status {
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return mastodonApi.statusObservable(statusId).await()
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}
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private suspend fun getStatusList(minId: String? = null, maxId: String? = null, limit: Int): List<Status> {
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return mastodonApi.accountStatusesObservable(
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accountId = accountId,
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maxId = maxId,
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sinceId = null,
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minId = minId,
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limit = limit,
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excludeReblogs = true
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).await()
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}
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}
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