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/*
* Copyright (C) 2015 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.tv.common;
import android.media.tv.TvContentRating;
import android.support.annotation.Nullable;
import android.support.annotation.VisibleForTesting;
import android.text.TextUtils;
import android.util.ArrayMap;
import android.util.Log;
import com.android.tv.common.memory.MemoryManageable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
/** TvContentRating cache. */
public final class TvContentRatingCache implements MemoryManageable {
private static final String TAG = "TvContentRatings";
private static final TvContentRatingCache INSTANCE = new TvContentRatingCache();
public static TvContentRatingCache getInstance() {
return INSTANCE;
}
// @GuardedBy("TvContentRatingCache.this")
private final Map<String, TvContentRating[]> mRatingsMultiMap = new ArrayMap<>();
/**
* Returns an array TvContentRatings from a string of comma separated set of rating strings
* creating each from {@link TvContentRating#unflattenFromString(String)} if needed. Returns
* {@code null} if the string is empty or contains no valid ratings.
*/
@Nullable
public synchronized TvContentRating[] getRatings(String commaSeparatedRatings) {
if (TextUtils.isEmpty(commaSeparatedRatings)) {
return null;
}
TvContentRating[] tvContentRatings;
if (mRatingsMultiMap.containsKey(commaSeparatedRatings)) {
tvContentRatings = mRatingsMultiMap.get(commaSeparatedRatings);
} else {
String normalizedRatings =
TextUtils.join(",", getSortedSetFromCsv(commaSeparatedRatings));
if (mRatingsMultiMap.containsKey(normalizedRatings)) {
tvContentRatings = mRatingsMultiMap.get(normalizedRatings);
} else {
tvContentRatings = stringToContentRatings(commaSeparatedRatings);
mRatingsMultiMap.put(normalizedRatings, tvContentRatings);
}
if (!normalizedRatings.equals(commaSeparatedRatings)) {
// Add an entry so the non normalized entry points to the same result;
mRatingsMultiMap.put(commaSeparatedRatings, tvContentRatings);
}
}
return tvContentRatings;
}
/** Returns a sorted array of TvContentRatings from a comma separated string of ratings. */
@VisibleForTesting
static TvContentRating[] stringToContentRatings(String commaSeparatedRatings) {
if (TextUtils.isEmpty(commaSeparatedRatings)) {
return null;
}
Set<String> ratingStrings = getSortedSetFromCsv(commaSeparatedRatings);
List<TvContentRating> contentRatings = new ArrayList<>();
for (String rating : ratingStrings) {
try {
contentRatings.add(TvContentRating.unflattenFromString(rating));
} catch (IllegalArgumentException e) {
Log.e(TAG, "Can't parse the content rating: '" + rating + "'", e);
}
}
return contentRatings.size() == 0
? null
: contentRatings.toArray(new TvContentRating[contentRatings.size()]);
}
private static Set<String> getSortedSetFromCsv(String commaSeparatedRatings) {
String[] ratingStrings = commaSeparatedRatings.split("\\s*,\\s*");
return toSortedSet(ratingStrings);
}
private static Set<String> toSortedSet(String[] ratingStrings) {
if (ratingStrings.length == 0) {
return Collections.EMPTY_SET;
} else if (ratingStrings.length == 1) {
return Collections.singleton(ratingStrings[0]);
} else {
// Using a TreeSet here is not very efficient, however it is good enough because:
// - the results are cached
// - in testing with multiple TISs, less than 50 entries are created
SortedSet<String> set = new TreeSet<>();
Collections.addAll(set, ratingStrings);
return set;
}
}
/**
* Returns a string of each flattened content rating, sorted and concatenated together with a
* comma.
*/
public static String contentRatingsToString(TvContentRating[] contentRatings) {
if (contentRatings == null || contentRatings.length == 0) {
return null;
}
String[] ratingStrings = new String[contentRatings.length];
for (int i = 0; i < contentRatings.length; i++) {
ratingStrings[i] = contentRatings[i].flattenToString();
}
if (ratingStrings.length == 1) {
return ratingStrings[0];
} else {
return TextUtils.join(",", toSortedSet(ratingStrings));
}
}
@Override
public synchronized void performTrimMemory(int level) {
mRatingsMultiMap.clear();
}
private TvContentRatingCache() {}
}
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