InitialPagingSource.kt
/*
* Copyright 2021 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
*
* http://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 androidx.paging
import androidx.annotation.RestrictTo
/**
* [InitialPagingSource] is a placeholder [PagingSource] implementation that only returns empty
* pages and `null` keys.
*
* It should be used exclusively in [InitialPagedList] since it is required to be supplied
* synchronously, but [DataSource.Factory] should run on background thread.
*
* @suppress
*/
@RestrictTo(RestrictTo.Scope.LIBRARY)
public class InitialPagingSource<K : Any, V : Any> : PagingSource<K, V>() {
override suspend fun load(params: LoadParams<K>): LoadResult<K, V> {
return LoadResult.Page.empty()
}
override fun getRefreshKey(state: PagingState<K, V>): K? {
return null
}
}