mirror of https://github.com/M66B/FairEmail.git
52 lines
1.7 KiB
Java
52 lines
1.7 KiB
Java
/*
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* Copyright 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package androidx.paging;
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import androidx.annotation.NonNull;
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import java.util.ArrayList;
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import java.util.List;
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class ListDataSource<T> extends PositionalDataSource<T> {
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private final List<T> mList;
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public ListDataSource(List<T> list) {
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mList = new ArrayList<>(list);
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}
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@Override
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public void loadInitial(@NonNull LoadInitialParams params,
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@NonNull LoadInitialCallback<T> callback) {
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final int totalCount = mList.size();
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final int position = computeInitialLoadPosition(params, totalCount);
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final int loadSize = computeInitialLoadSize(params, position, totalCount);
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// for simplicity, we could return everything immediately,
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// but we tile here since it's expected behavior
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List<T> sublist = mList.subList(position, position + loadSize);
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callback.onResult(sublist, position, totalCount);
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}
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@Override
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public void loadRange(@NonNull LoadRangeParams params,
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@NonNull LoadRangeCallback<T> callback) {
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callback.onResult(mList.subList(params.startPosition,
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params.startPosition + params.loadSize));
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}
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}
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