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A library jar that provides APIs for Applications written for the Google Android Platform.
/*
* 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 java.util.ArrayList;
import java.util.List;
class ListDataSource extends PositionalDataSource {
private final List mList;
public ListDataSource(List list) {
mList = new ArrayList<>(list);
}
@Override
public void loadInitial(@NonNull LoadInitialParams params,
@NonNull LoadInitialCallback callback) {
final int totalCount = mList.size();
final int position = computeInitialLoadPosition(params, totalCount);
final int loadSize = computeInitialLoadSize(params, position, totalCount);
// for simplicity, we could return everything immediately,
// but we tile here since it's expected behavior
List sublist = mList.subList(position, position + loadSize);
callback.onResult(sublist, position, totalCount);
}
@Override
public void loadRange(@NonNull LoadRangeParams params,
@NonNull LoadRangeCallback callback) {
callback.onResult(mList.subList(params.startPosition,
params.startPosition + params.loadSize));
}
}