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/*
* 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(
new Pair<>(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;
}
}
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