| /* |
| * Copyright 2018 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.NonNull; |
| import androidx.annotation.Nullable; |
| |
| import java.util.concurrent.Executor; |
| |
| abstract class ContiguousDataSource<Key, Value> extends DataSource<Key, Value> { |
| @Override |
| boolean isContiguous() { |
| return true; |
| } |
| |
| abstract void dispatchLoadInitial( |
| @Nullable Key key, |
| int initialLoadSize, |
| int pageSize, |
| boolean enablePlaceholders, |
| @NonNull Executor mainThreadExecutor, |
| @NonNull PageResult.Receiver<Value> receiver); |
| |
| abstract void dispatchLoadAfter( |
| int currentEndIndex, |
| @NonNull Value currentEndItem, |
| int pageSize, |
| @NonNull Executor mainThreadExecutor, |
| @NonNull PageResult.Receiver<Value> receiver); |
| |
| abstract void dispatchLoadBefore( |
| int currentBeginIndex, |
| @NonNull Value currentBeginItem, |
| int pageSize, |
| @NonNull Executor mainThreadExecutor, |
| @NonNull PageResult.Receiver<Value> receiver); |
| |
| /** |
| * Get the key from either the position, or item, or null if position/item invalid. |
| * <p> |
| * Position may not match passed item's position - if trying to query the key from a position |
| * that isn't yet loaded, a fallback item (last loaded item accessed) will be passed. |
| */ |
| abstract Key getKey(int position, Value item); |
| } |