ContentRatingLevelPolicy.java revision 816a4be1a0f34f6a48877c8afd3dbbca19eac435 
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
17package com.android.tv.parental;
18
19import android.media.tv.TvContentRating;
20
21import com.android.tv.parental.ContentRatingSystem.Rating;
22import com.android.tv.parental.ContentRatingSystem.SubRating;
23import com.android.tv.util.TvSettings;
24import com.android.tv.util.TvSettings.ContentRatingLevel;
25
26import java.util.HashSet;
27import java.util.Set;
28
29public class ContentRatingLevelPolicy {
30    private static final int AGE_THRESHOLD_FOR_LEVEL_HIGH = 6;
31    private static final int AGE_THRESHOLD_FOR_LEVEL_MEDIUM = 12;
32    private static final int AGE_THRESHOLD_FOR_LEVEL_LOW = -1; // Highest age for each rating system
33
34    private ContentRatingLevelPolicy() { }
35
36    public static Set<TvContentRating> getRatingsForLevel(
37            ParentalControlSettings settings, ContentRatingsManager manager,
38            @ContentRatingLevel int level) {
39        if (level == TvSettings.CONTENT_RATING_LEVEL_NONE) {
40            return new HashSet<>();
41        } else if (level == TvSettings.CONTENT_RATING_LEVEL_HIGH) {
42            return getRatingsForAge(settings, manager, AGE_THRESHOLD_FOR_LEVEL_HIGH);
43        } else if (level == TvSettings.CONTENT_RATING_LEVEL_MEDIUM) {
44            return getRatingsForAge(settings, manager, AGE_THRESHOLD_FOR_LEVEL_MEDIUM);
45        } else if (level == TvSettings.CONTENT_RATING_LEVEL_LOW) {
46            return getRatingsForAge(settings, manager, AGE_THRESHOLD_FOR_LEVEL_LOW);
47        }
48        throw new IllegalArgumentException("Unexpected rating level");
49    }
50
51    private static Set<TvContentRating> getRatingsForAge(
52            ParentalControlSettings settings, ContentRatingsManager manager, int age) {
53        Set<TvContentRating> ratings = new HashSet<>();
54
55        for (ContentRatingSystem contentRatingSystem : manager.getContentRatingSystems()) {
56            if (!settings.isContentRatingSystemEnabled(contentRatingSystem)) {
57                continue;
58            }
59            int ageLimit = age;
60            if (ageLimit == AGE_THRESHOLD_FOR_LEVEL_LOW) {
61                ageLimit = getMaxAge(contentRatingSystem);
62            }
63            for (Rating rating : contentRatingSystem.getRatings()) {
64                if (rating.getAgeHint() < ageLimit) {
65                    continue;
66                }
67                TvContentRating tvContentRating = TvContentRating.createRating(
68                        contentRatingSystem.getDomain(), contentRatingSystem.getName(),
69                        rating.getName());
70                ratings.add(tvContentRating);
71                for (SubRating subRating : rating.getSubRatings()) {
72                    tvContentRating = TvContentRating.createRating(
73                            contentRatingSystem.getDomain(), contentRatingSystem.getName(),
74                            rating.getName(), subRating.getName());
75                    ratings.add(tvContentRating);
76                }
77            }
78        }
79
80        return ratings;
81    }
82
83    private static int getMaxAge(ContentRatingSystem contentRatingSystem) {
84        int maxAge = 0;
85        for (Rating rating : contentRatingSystem.getRatings()) {
86            if (maxAge < rating.getAgeHint()) {
87                maxAge = rating.getAgeHint();
88            }
89        }
90        return maxAge;
91    }
92}
93