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      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 package com.google.android.car.diagnosticverifier;
     17 
     18 import android.car.diagnostic.CarDiagnosticEvent;
     19 import android.util.JsonReader;
     20 
     21 import com.android.car.vehiclehal.DiagnosticJson;
     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 /**
     29  * This class provides method to convert JSON into car diagnostic event object.
     30  */
     31 public class DiagnosticJsonConverter {
     32 
     33     public static List<CarDiagnosticEvent> readFromJson(InputStream in) throws IOException {
     34         JsonReader reader = new JsonReader(new InputStreamReader(in, "UTF-8"));
     35 
     36         try {
     37             return readEventsArray(reader);
     38         } finally {
     39             reader.close();
     40         }
     41     }
     42 
     43     private static List<CarDiagnosticEvent> readEventsArray(JsonReader reader) throws IOException {
     44         List<CarDiagnosticEvent> events = new ArrayList<>();
     45 
     46         reader.beginArray();
     47         while (reader.hasNext()) {
     48             events.add(readEventAndCanonicalize(reader));
     49         }
     50         reader.endArray();
     51         return events;
     52     }
     53 
     54     public static CarDiagnosticEvent readEventAndCanonicalize(InputStream in) throws IOException {
     55         JsonReader reader = new JsonReader(new InputStreamReader(in, "UTF-8"));
     56         return readEventAndCanonicalize(reader);
     57     }
     58 
     59     /**
     60      * This method convert JSON to a car diagnostic event object.
     61      * Note: it will always set timestamp to 0 and set dtc to null if it is empty string.
     62      */
     63     private static CarDiagnosticEvent readEventAndCanonicalize(JsonReader reader)
     64             throws IOException {
     65         DiagnosticJson diagnosticJson = DiagnosticJson.build(reader);
     66         //Build event
     67         CarDiagnosticEvent.Builder builder = "freeze".equals(diagnosticJson.type) ?
     68                 CarDiagnosticEvent.Builder.newFreezeFrameBuilder() :
     69                 CarDiagnosticEvent.Builder.newLiveFrameBuilder();
     70         //Always skip timestamp because it is not useful for test
     71         builder.atTimestamp(0);
     72         for (int i = 0; i < diagnosticJson.intValues.size(); i++) {
     73             builder.withIntValue(diagnosticJson.intValues.keyAt(i),
     74                     diagnosticJson.intValues.valueAt(i));
     75         }
     76         for (int i = 0; i < diagnosticJson.floatValues.size(); i++) {
     77             builder.withFloatValue(diagnosticJson.floatValues.keyAt(i),
     78                     diagnosticJson.floatValues.valueAt(i));
     79         }
     80         //Always set dtc to null if it is empty string
     81         builder.withDtc("".equals(diagnosticJson.dtc) ? null : diagnosticJson.dtc);
     82 
     83         return builder.build();
     84     }
     85 }
     86