/* * Copyright (C) 2017 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 android.arch.paging; import android.support.annotation.Nullable; import android.support.annotation.RestrictTo; import android.support.annotation.WorkerThread; import java.util.ArrayList; import java.util.Collections; import java.util.List; /** * Simplest data source form that provides all of its data through a single loadRange() method. *
* Requires that your data resides in positions 0
through N
, where
* N
is the value returned from {@link #countItems()}. You must return the exact number
* requested, so that the data as returned can be safely prepended/appended to what has already
* been loaded.
*
* For more flexibility in how many items to load, or to avoid counting your data source, override
* {@link PositionalDataSource} directly.
*
* @param