1 /*
2  * Copyright 2021 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package androidx.room.paging
17 
18 import androidx.paging.PagingState
19 import androidx.room.RoomDatabase
20 import androidx.room.RoomRawQuery
21 import androidx.sqlite.SQLiteConnection
22 
23 @Suppress("UNUSED_PARAMETER")
24 abstract class LimitOffsetPagingSource<T : Any>(
25     private val sourceQuery: RoomRawQuery,
26     private val db: RoomDatabase,
27     vararg tables: String
28 ) : androidx.paging.PagingSource<Int, T>() {
getRefreshKeynull29     override fun getRefreshKey(state: PagingState<Int, T>): Int? {
30         return 0
31     }
32 
loadnull33     override public suspend fun load(params: LoadParams<Int>): LoadResult<Int, T> {
34         return LoadResult.Invalid()
35     }
convertRowsnull36     protected abstract suspend fun convertRows(limitOffsetQuery: RoomRawQuery, itemCount: Int): List<T>
37 }