1/*
2 * Copyright (c) 2024 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16// eslint-disable-next-line @typescript-eslint/no-unused-vars
17class BasicPrefetcher implements IPrefetcher {
18  private readonly fetchingDriver: FetchingDriver;
19
20  constructor(ds?: IDataSourcePrefetching) {
21    const itemsOnScreen = new ItemsOnScreenProvider();
22    const fetchedRegistry = new FetchedRegistry();
23    const fetchingRegistry = new FetchingRegistry();
24    const prefetchRangeRatio = new PrefetchRangeRatio(itemsOnScreen, fetchedRegistry, fetchingRegistry);
25    const prefetchCount = new PrefetchCount(itemsOnScreen, prefetchRangeRatio);
26    const evaluator = new FetchingRangeEvaluator(itemsOnScreen, prefetchCount, prefetchRangeRatio, fetchedRegistry);
27    this.fetchingDriver = new FetchingDriver(fetchedRegistry, fetchingRegistry, evaluator, new DefaultTimeProvider());
28    this.fetchingDriver.setDataSource(ds);
29  }
30
31  setDataSource(ds: IDataSourcePrefetching): void {
32    this.fetchingDriver.setDataSource(ds);
33  }
34
35  visibleAreaChanged(minVisible: number, maxVisible: number): void {
36    this.fetchingDriver.visibleAreaChanged(minVisible, maxVisible);
37  }
38}
39