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/*
* Copyright 2019 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 com.android.car.media.testmediaapp;
import android.text.TextUtils;
import android.util.Log;
import androidx.annotation.Nullable;
import com.android.car.media.testmediaapp.loader.TmaLoader;
import com.android.car.media.testmediaapp.prefs.TmaEnumPrefs.TmaBrowseNodeType;
import java.util.HashMap;
import java.util.Map;
/**
* Delegates the loading of {@link TmaMediaItem}s to {@link TmaLoader} and caches the results
* for {@link TmaBrowser}.
*/
class TmaLibrary {
private static final String TAG = "TmaLibrary";
private final TmaLoader mLoader;
private final Map<TmaBrowseNodeType, String> mRootAssetPaths = new HashMap<>(5);
/** Stores the root item of each loaded media asset file, keyed by the file's path. */
private final Map<String, TmaMediaItem> mCachedFilesByPath = new HashMap<>(50);
/** Stores every item of every loaded media asset file, keyed by the media id. */
private final Map<String, TmaMediaItem> mMediaItemsByMediaId = new HashMap<>(500);
TmaLibrary(TmaLoader loader) {
mLoader = loader;
mRootAssetPaths.put(TmaBrowseNodeType.NULL, null);
mRootAssetPaths.put(TmaBrowseNodeType.EMPTY, "media_items/empty.json");
mRootAssetPaths.put(TmaBrowseNodeType.QUEUE_ONLY, "media_items/empty.json");
mRootAssetPaths.put(TmaBrowseNodeType.SINGLE_TAB, "media_items/single_node.json");
mRootAssetPaths.put(TmaBrowseNodeType.NODE_CHILDREN, "media_items/only_nodes.json");
mRootAssetPaths.put(TmaBrowseNodeType.LEAF_CHILDREN, "media_items/simple_leaves.json");
mRootAssetPaths.put(TmaBrowseNodeType.MIXED_CHILDREN, "media_items/mixed.json");
mRootAssetPaths.put(TmaBrowseNodeType.UNTAGGED, "media_items/untagged.json");
}
@Nullable
TmaMediaItem getRoot(TmaBrowseNodeType rootType) {
String filePath = mRootAssetPaths.get(rootType);
return (filePath != null) ? loadAssetFile(filePath) : null;
}
@Nullable
TmaMediaItem getMediaItemById(String mediaId) {
TmaMediaItem result = mMediaItemsByMediaId.get(mediaId);
// Processing includes only on request allows recursive structures :-)
if (result != null && !TextUtils.isEmpty(result.mInclude)) {
result = result.append(loadAssetFile(result.mInclude).mChildren);
}
return result;
}
private TmaMediaItem loadAssetFile(String filePath) {
TmaMediaItem result = mCachedFilesByPath.get(filePath);
if (result == null) {
result = mLoader.loadAssetFile(filePath);
if (result != null) {
mCachedFilesByPath.put(filePath, result);
cacheMediaItem(result);
} else {
Log.e(TAG, "Unable to load: " + filePath);
}
}
return result;
}
private void cacheMediaItem(TmaMediaItem item) {
String key = item.getMediaId();
if (mMediaItemsByMediaId.putIfAbsent(key, item) == null) {
for (TmaMediaItem child : item.mChildren) {
cacheMediaItem(child);
}
} else {
Log.e(TAG, "Ignoring item with duplicate media id: " + key);
}
}
}
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