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.paging.rxjava3
17 
18 import android.database.Cursor
19 import androidx.paging.PagingState
20 import androidx.room.RoomDatabase
21 import androidx.room.RoomSQLiteQuery
22 import androidx.room.paging.CursorSQLiteStatement
23 import androidx.sqlite.SQLiteStatement
24 
25 @Suppress("UNUSED_PARAMETER")
26 abstract class RxPagingSource<K : Any, T : Any>(
27     private val sourceQuery: RoomSQLiteQuery,
28     private val db: RoomDatabase,
29     vararg tables: String
30 ) : androidx.paging.PagingSource<K, T>() {
getRefreshKeynull31     override fun getRefreshKey(state: PagingState<K, T>): K? {
32         return null
33     }
34 
loadnull35     override public suspend fun load(params: LoadParams<K>): LoadResult<K, T> {
36         return LoadResult.Invalid()
37     }
38 
convertRowsnull39     protected open fun convertRows(cursor: Cursor): List<T> {
40         return convertRows(CursorSQLiteStatement(cursor))
41     }
42 
convertRowsnull43     protected open fun convertRows(statement: SQLiteStatement): List<T> {
44         throw NotImplementedError(
45             "Unexpected call to a function with no implementation that Room is suppose to " +
46                 "generate."
47         )
48     }
49 }