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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.tv.parental;
     18 
     19 import android.media.tv.TvContentRating;
     20 import com.android.tv.parental.ContentRatingSystem.Rating;
     21 import com.android.tv.parental.ContentRatingSystem.SubRating;
     22 import com.android.tv.util.TvSettings;
     23 import com.android.tv.util.TvSettings.ContentRatingLevel;
     24 import java.util.HashSet;
     25 import java.util.Set;
     26 
     27 public class ContentRatingLevelPolicy {
     28     private static final int AGE_THRESHOLD_FOR_LEVEL_HIGH = 6;
     29     private static final int AGE_THRESHOLD_FOR_LEVEL_MEDIUM = 12;
     30     private static final int AGE_THRESHOLD_FOR_LEVEL_LOW = -1; // Highest age for each rating system
     31 
     32     private ContentRatingLevelPolicy() {}
     33 
     34     public static Set<TvContentRating> getRatingsForLevel(
     35             ParentalControlSettings settings,
     36             ContentRatingsManager manager,
     37             @ContentRatingLevel int level) {
     38         if (level == TvSettings.CONTENT_RATING_LEVEL_NONE) {
     39             return new HashSet<>();
     40         } else if (level == TvSettings.CONTENT_RATING_LEVEL_HIGH) {
     41             return getRatingsForAge(settings, manager, AGE_THRESHOLD_FOR_LEVEL_HIGH);
     42         } else if (level == TvSettings.CONTENT_RATING_LEVEL_MEDIUM) {
     43             return getRatingsForAge(settings, manager, AGE_THRESHOLD_FOR_LEVEL_MEDIUM);
     44         } else if (level == TvSettings.CONTENT_RATING_LEVEL_LOW) {
     45             return getRatingsForAge(settings, manager, AGE_THRESHOLD_FOR_LEVEL_LOW);
     46         }
     47         throw new IllegalArgumentException("Unexpected rating level");
     48     }
     49 
     50     private static Set<TvContentRating> getRatingsForAge(
     51             ParentalControlSettings settings, ContentRatingsManager manager, int age) {
     52         Set<TvContentRating> ratings = new HashSet<>();
     53 
     54         for (ContentRatingSystem contentRatingSystem : manager.getContentRatingSystems()) {
     55             if (!settings.isContentRatingSystemEnabled(contentRatingSystem)) {
     56                 continue;
     57             }
     58             int ageLimit = age;
     59             if (ageLimit == AGE_THRESHOLD_FOR_LEVEL_LOW) {
     60                 ageLimit = getMaxAge(contentRatingSystem);
     61             }
     62             for (Rating rating : contentRatingSystem.getRatings()) {
     63                 if (rating.getAgeHint() < ageLimit) {
     64                     continue;
     65                 }
     66                 TvContentRating tvContentRating =
     67                         TvContentRating.createRating(
     68                                 contentRatingSystem.getDomain(),
     69                                 contentRatingSystem.getName(),
     70                                 rating.getName());
     71                 ratings.add(tvContentRating);
     72                 for (SubRating subRating : rating.getSubRatings()) {
     73                     tvContentRating =
     74                             TvContentRating.createRating(
     75                                     contentRatingSystem.getDomain(), contentRatingSystem.getName(),
     76                                     rating.getName(), subRating.getName());
     77                     ratings.add(tvContentRating);
     78                 }
     79             }
     80         }
     81 
     82         return ratings;
     83     }
     84 
     85     private static int getMaxAge(ContentRatingSystem contentRatingSystem) {
     86         int maxAge = 0;
     87         for (Rating rating : contentRatingSystem.getRatings()) {
     88             if (maxAge < rating.getAgeHint()) {
     89                 maxAge = rating.getAgeHint();
     90             }
     91         }
     92         return maxAge;
     93     }
     94 }
     95