107 lines
3.8 KiB
Java
107 lines
3.8 KiB
Java
/*
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* Copyright (C) 2016 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 android.media.browse;
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import android.os.Bundle;
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import java.util.Collections;
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import java.util.List;
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/**
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* @hide
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*/
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public class MediaBrowserUtils {
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/**
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* Compares whether two bundles are the same.
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*/
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public static boolean areSameOptions(Bundle options1, Bundle options2) {
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if (options1 == options2) {
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return true;
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} else if (options1 == null) {
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return options2.getInt(MediaBrowser.EXTRA_PAGE, -1) == -1
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&& options2.getInt(MediaBrowser.EXTRA_PAGE_SIZE, -1) == -1;
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} else if (options2 == null) {
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return options1.getInt(MediaBrowser.EXTRA_PAGE, -1) == -1
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&& options1.getInt(MediaBrowser.EXTRA_PAGE_SIZE, -1) == -1;
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} else {
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return options1.getInt(MediaBrowser.EXTRA_PAGE, -1)
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== options2.getInt(MediaBrowser.EXTRA_PAGE, -1)
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&& options1.getInt(MediaBrowser.EXTRA_PAGE_SIZE, -1)
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== options2.getInt(MediaBrowser.EXTRA_PAGE_SIZE, -1);
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}
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}
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/**
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* Returnes true if the page options has duplicated items.
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*/
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public static boolean hasDuplicatedItems(Bundle options1, Bundle options2) {
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int page1 = options1 == null ? -1 : options1.getInt(MediaBrowser.EXTRA_PAGE, -1);
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int page2 = options2 == null ? -1 : options2.getInt(MediaBrowser.EXTRA_PAGE, -1);
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int pageSize1 = options1 == null ? -1 : options1.getInt(MediaBrowser.EXTRA_PAGE_SIZE, -1);
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int pageSize2 = options2 == null ? -1 : options2.getInt(MediaBrowser.EXTRA_PAGE_SIZE, -1);
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int startIndex1, startIndex2, endIndex1, endIndex2;
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if (page1 == -1 || pageSize1 == -1) {
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startIndex1 = 0;
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endIndex1 = Integer.MAX_VALUE;
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} else {
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startIndex1 = pageSize1 * page1;
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endIndex1 = startIndex1 + pageSize1 - 1;
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}
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if (page2 == -1 || pageSize2 == -1) {
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startIndex2 = 0;
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endIndex2 = Integer.MAX_VALUE;
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} else {
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startIndex2 = pageSize2 * page2;
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endIndex2 = startIndex2 + pageSize2 - 1;
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}
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if (startIndex1 <= startIndex2 && startIndex2 <= endIndex1) {
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return true;
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} else if (startIndex1 <= endIndex2 && endIndex2 <= endIndex1) {
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return true;
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}
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return false;
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}
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/**
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* Returns a paged version of the given {@code list}, using the paging parameters in {@code
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* options}.
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*/
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public static List<MediaBrowser.MediaItem> applyPagingOptions(
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List<MediaBrowser.MediaItem> list, final Bundle options) {
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if (list == null) {
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return null;
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}
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int page = options.getInt(MediaBrowser.EXTRA_PAGE, -1);
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int pageSize = options.getInt(MediaBrowser.EXTRA_PAGE_SIZE, -1);
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if (page == -1 && pageSize == -1) {
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return list;
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}
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int fromIndex = pageSize * page;
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int toIndex = fromIndex + pageSize;
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if (page < 0 || pageSize < 1 || fromIndex >= list.size()) {
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return Collections.EMPTY_LIST;
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}
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if (toIndex > list.size()) {
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toIndex = list.size();
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}
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return list.subList(fromIndex, toIndex);
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}
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}
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