1 /* 2 * Copyright (C) 2017 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.car.obd2; 18 19 import android.os.SystemClock; 20 import android.util.JsonWriter; 21 import android.util.Log; 22 import com.android.car.obd2.Obd2Command.LiveFrameCommand; 23 import java.io.IOException; 24 import java.util.ArrayList; 25 import java.util.List; 26 import java.util.Optional; 27 import java.util.Set; 28 29 public class Obd2LiveFrameGenerator { 30 public static final int FRAME_TYPE_LIVE = 1; 31 public static final String TAG = Obd2LiveFrameGenerator.class.getSimpleName(); 32 33 private final Obd2Connection mConnection; 34 private final List<LiveFrameCommand<Integer>> mIntegerCommands = new ArrayList<>(); 35 private final List<LiveFrameCommand<Float>> mFloatCommands = new ArrayList<>(); 36 Obd2LiveFrameGenerator(Obd2Connection connection)37 public Obd2LiveFrameGenerator(Obd2Connection connection) 38 throws IOException, InterruptedException { 39 mConnection = connection; 40 Set<Integer> connectionPids = connection.getSupportedPIDs(); 41 Set<Integer> apiIntegerPids = Obd2Command.getSupportedIntegerCommands(); 42 Set<Integer> apiFloatPids = Obd2Command.getSupportedFloatCommands(); 43 apiIntegerPids 44 .stream() 45 .filter(connectionPids::contains) 46 .forEach( 47 (Integer pid) -> 48 mIntegerCommands.add( 49 Obd2Command.getLiveFrameCommand( 50 Obd2Command.getIntegerCommand(pid)))); 51 apiFloatPids 52 .stream() 53 .filter(connectionPids::contains) 54 .forEach( 55 (Integer pid) -> 56 mFloatCommands.add( 57 Obd2Command.getLiveFrameCommand( 58 Obd2Command.getFloatCommand(pid)))); 59 } 60 generate(JsonWriter jsonWriter)61 public JsonWriter generate(JsonWriter jsonWriter) throws IOException { 62 return generate(jsonWriter, SystemClock.elapsedRealtimeNanos()); 63 } 64 generate(JsonWriter jsonWriter, long timestamp)65 public JsonWriter generate(JsonWriter jsonWriter, long timestamp) throws IOException { 66 jsonWriter.beginObject(); 67 jsonWriter.name("type").value(FRAME_TYPE_LIVE); 68 jsonWriter.name("timestamp").value(timestamp); 69 jsonWriter.name("intValues").beginArray(); 70 for (LiveFrameCommand<Integer> command : mIntegerCommands) { 71 try { 72 Optional<Integer> result = command.run(mConnection); 73 if (result.isPresent()) { 74 jsonWriter.beginObject(); 75 jsonWriter.name("id").value(command.getPid()); 76 jsonWriter.name("value").value(result.get()); 77 jsonWriter.endObject(); 78 } 79 } catch (IOException | InterruptedException e) { 80 Log.w( 81 TAG, 82 String.format( 83 "unable to retrieve OBD2 pid %d due to exception: %s", 84 command.getPid(), e)); 85 // skip this entry 86 } 87 } 88 jsonWriter.endArray(); 89 90 jsonWriter.name("floatValues").beginArray(); 91 for (LiveFrameCommand<Float> command : mFloatCommands) { 92 try { 93 Optional<Float> result = command.run(mConnection); 94 if (result.isPresent()) { 95 jsonWriter.beginObject(); 96 jsonWriter.name("id").value(command.getPid()); 97 jsonWriter.name("value").value(result.get()); 98 jsonWriter.endObject(); 99 } 100 } catch (IOException | InterruptedException e) { 101 Log.w( 102 TAG, 103 String.format( 104 "unable to retrieve OBD2 pid %d due to exception: %s", 105 command.getPid(), e)); 106 // skip this entry 107 } 108 } 109 jsonWriter.endArray(); 110 111 return jsonWriter.endObject(); 112 } 113 } 114