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.tuner.setup; 18 19 import android.util.Log; 20 import com.android.tv.tuner.api.ScanChannel; 21 import java.io.BufferedReader; 22 import java.io.IOException; 23 import java.io.InputStream; 24 import java.io.InputStreamReader; 25 import java.util.ArrayList; 26 import java.util.List; 27 28 /** Parses plain text formatted scan files, which contain the list of channels. */ 29 public final class ChannelScanFileParser { 30 private static final String TAG = "ChannelScanFileParser"; 31 32 /** 33 * Parses a given scan file and returns the list of {@link ScanChannel} objects. 34 * 35 * @param is {@link InputStream} of a scan file. Each line matches one channel. The line format 36 * of the scan file is as follows:<br> 37 * "A <frequency> <modulation>". 38 * @return a list of {@link ScanChannel} objects parsed 39 */ parseScanFile(InputStream is)40 public static List<ScanChannel> parseScanFile(InputStream is) { 41 BufferedReader in = new BufferedReader(new InputStreamReader(is)); 42 String line; 43 List<ScanChannel> scanChannelList = new ArrayList<>(); 44 try { 45 while ((line = in.readLine()) != null) { 46 if (line.isEmpty()) { 47 continue; 48 } 49 if (line.charAt(0) == '#') { 50 // Skip comment line 51 continue; 52 } 53 String[] tokens = line.split("\\s+"); 54 if (tokens.length != 3 && tokens.length != 4) { 55 continue; 56 } 57 scanChannelList.add( 58 ScanChannel.forTuner( 59 Integer.parseInt(tokens[1]), 60 tokens[2], 61 tokens.length == 4 ? Integer.parseInt(tokens[3]) : null)); 62 } 63 } catch (IOException e) { 64 Log.e(TAG, "error on parseScanFile()", e); 65 } 66 return scanChannelList; 67 } 68 ChannelScanFileParser()69 private ChannelScanFileParser(){} 70 } 71