| /* |
| * Copyright (C) 2017 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.google.android.tv.partner.support; |
| |
| import android.support.annotation.VisibleForTesting; |
| import android.text.TextUtils; |
| import android.util.Log; |
| import android.util.Pair; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.Comparator; |
| import java.util.List; |
| import java.util.regex.Pattern; |
| |
| /** Utility class for providing tuner setup. */ |
| public class TunerSetupUtils { |
| private static final String TAG = "TunerSetupUtils"; |
| |
| private static final Pattern CHANNEL_NUMBER_DELIMITER = Pattern.compile("([ .-])"); |
| |
| public static List<Pair<Lineup, Integer>> lineupChannelMatchCount( |
| List<Lineup> lineups, List<String> localChannels) { |
| List<Pair<Lineup, Integer>> result = new ArrayList<>(); |
| List<List<String>> parsedLocalChannels = parseChannelNumbers(localChannels); |
| for (Lineup lineup : lineups) { |
| result.add( |
| Pair.create(lineup, getMatchCount(lineup.getChannels(), parsedLocalChannels))); |
| } |
| // sort in decreasing order |
| Collections.sort( |
| result, |
| new Comparator<Pair<Lineup, Integer>>() { |
| @Override |
| public int compare(Pair<Lineup, Integer> pair, Pair<Lineup, Integer> other) { |
| return Integer.compare(other.second, pair.second); |
| } |
| }); |
| return result; |
| } |
| |
| @VisibleForTesting |
| static int getMatchCount(List<String> lineupChannels, List<List<String>> parsedLocalChannels) { |
| int count = 0; |
| List<List<String>> parsedLineupChannels = parseChannelNumbers(lineupChannels); |
| for (List<String> parsedLineupChannel : parsedLineupChannels) { |
| for (List<String> parsedLocalChannel : parsedLocalChannels) { |
| if (matchChannelNumber(parsedLineupChannel, parsedLocalChannel)) { |
| count++; |
| break; |
| } |
| } |
| } |
| return count; |
| } |
| |
| /** |
| * Parses the channel number string to a list of numbers (major number, minor number, etc.). |
| * |
| * @param channelNumber the display number of the channel |
| * @return a list of numbers |
| */ |
| @VisibleForTesting |
| static List<String> parseChannelNumber(String channelNumber) { |
| List<String> numbers = |
| new ArrayList<>( |
| Arrays.asList(TextUtils.split(channelNumber, CHANNEL_NUMBER_DELIMITER))); |
| numbers.removeAll(Collections.singleton("")); |
| if (numbers.size() < 1 || numbers.size() > 2) { |
| Log.w(TAG, "unsupported channel number format: " + channelNumber); |
| return new ArrayList<>(); |
| } |
| return numbers; |
| } |
| |
| /** |
| * Parses a list of channel numbers. See {@link #parseChannelNumber(String)}. |
| * |
| * @param channelNumbers a list of channel display numbers |
| */ |
| @VisibleForTesting |
| static List<List<String>> parseChannelNumbers(List<String> channelNumbers) { |
| List<List<String>> numbers = new ArrayList<>(channelNumbers.size()); |
| for (String channelNumber : channelNumbers) { |
| if (!TextUtils.isEmpty(channelNumber)) { |
| numbers.add(parseChannelNumber(channelNumber)); |
| } |
| } |
| return numbers; |
| } |
| |
| /** |
| * Checks whether two lists of channel numbers match or not. If the sizes are different, |
| * additional elements are ignore. |
| */ |
| @VisibleForTesting |
| static boolean matchChannelNumber(List<String> numbers, List<String> other) { |
| if (numbers.isEmpty() || other.isEmpty()) { |
| return false; |
| } |
| int i = 0; |
| int j = 0; |
| while (i < numbers.size() && j < other.size()) { |
| if (!numbers.get(i++).equals(other.get(j++))) { |
| return false; |
| } |
| } |
| return true; |
| } |
| } |