Android Open Source - Speedometer Measurement Json Convertor






From Project

Back to project page Speedometer.

License

The source code is released under:

Apache License

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Java Source Code

/* Copyright 2012 Google Inc.
 */*from w w w .  ja  v a 2 s .  co m*/
 * 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.wireless.speed.speedometer.util;

import com.google.myjson.FieldNamingPolicy;
import com.google.myjson.Gson;
import com.google.myjson.GsonBuilder;
import com.google.myjson.JsonDeserializationContext;
import com.google.myjson.JsonDeserializer;
import com.google.myjson.JsonElement;
import com.google.myjson.JsonParseException;
import com.google.myjson.JsonPrimitive;
import com.google.myjson.JsonSerializationContext;
import com.google.myjson.JsonSerializer;
import com.google.wireless.speed.speedometer.Logger;
import com.google.wireless.speed.speedometer.MeasurementDesc;
import com.google.wireless.speed.speedometer.MeasurementTask;
import com.google.wireless.speed.speedometer.SpeedometerApp;

import android.content.Context;
import android.util.Log;

import org.json.JSONException;
import org.json.JSONObject;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;

/**
 * Utility class that use the gson library to provide bidirectional conversion between
 * measurement objects (descriptions, tasks, and results, etc.) and JSON objects. 
 * New types of MeasurementDesc should be registered in the static HashMap initialization
 * section.
 * @author wenjiezeng@google.com (Steve Zeng)
 *
 */
@SuppressWarnings("rawtypes")
public class MeasurementJsonConvertor {
  /* 1. Automatically perform bidirectional translations for fields in java 'lowerCaseCamel' style 
   * to JSON 'lower_case_with_underscores' style. 
   * 2. Serialize and de-serialize UTC format date string
   * 3. It also serializes all null fields to 'null'
   */
  public static Gson gson = new GsonBuilder().serializeNulls().
      registerTypeAdapter(Date.class, new DateTypeConverter()).
      setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES).create();
  private static final DateFormat dateFormat = 
      new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");

  static {
    dateFormat.setTimeZone(TimeZone.getTimeZone("GMT"));
  }
  
  @SuppressWarnings("unchecked")
  public static MeasurementTask makeMeasurementTaskFromJson(JSONObject json, Context context) 
      throws IllegalArgumentException {  
    try {
      String type = String.valueOf(json.getString("type"));   
      Class taskClass = MeasurementTask.getTaskClassForMeasurement(type);
      Method getDescMethod = taskClass.getMethod("getDescClass");
      // The getDescClassForMeasurement() is static and takes no arguments
      Class descClass = (Class) getDescMethod.invoke(null, (Object[]) null);
      MeasurementDesc measurementDesc = gson.fromJson(json.toString(), descClass);
      Object[] cstParams = {measurementDesc, context};
      Constructor<MeasurementTask> constructor = 
          taskClass.getConstructor(MeasurementDesc.class, Context.class);
      return constructor.newInstance(cstParams);
    } catch (JSONException e) {
      throw new IllegalArgumentException(e);
    } catch (SecurityException e) {
      Logger.w(e.getMessage());
      throw new IllegalArgumentException(e);
    } catch (NoSuchMethodException e) {
      Logger.w(e.getMessage());
      throw new IllegalArgumentException(e);
    } catch (IllegalArgumentException e) {
      Logger.w(e.getMessage());
      throw new IllegalArgumentException(e);
    } catch (InstantiationException e) {
      Logger.w(e.getMessage());
      throw new IllegalArgumentException(e);
    } catch (IllegalAccessException e) {
      Logger.w(e.getMessage());
      throw new IllegalArgumentException(e);
    } catch (InvocationTargetException e) {
      Logger.w(e.toString());
      throw new IllegalArgumentException(e);
    } 
  }
  
  public static JSONObject encodeToJson(Object obj) throws JSONException {
    String str = gson.toJson(obj);
    return new JSONObject(str);
  }
  
  public static String toJsonString(Object obj) {
    return gson.toJson(obj);
  }
  
  public static Gson getGsonInstance() {
    return gson;
  }

  private static class DateTypeConverter implements JsonSerializer<Date>,
                                                        JsonDeserializer<Date> {
    @Override
    public JsonElement serialize(Date src, Type srcType, JsonSerializationContext context) {
      return new JsonPrimitive(formatDate(src));
    }

    @Override
    public Date deserialize(JsonElement json, Type type, JsonDeserializationContext context)
        throws JsonParseException {
      try {
        return parseDate(json.getAsString());
      } catch (NumberFormatException e) {
        throw new JsonParseException("Cannot convert time string: "  + json.toString());
      } catch (IllegalArgumentException e) {
        Logger.e("Cannot convert time string:" + json.toString());
        throw new JsonParseException("Cannot convert time string: " + json.toString());
      } catch (ParseException e) {
        throw new JsonParseException("Cannot convert UTC time string: "  + json.toString());
      }
    }
  }
  
  private static Date parseDate(String dateString) throws ParseException {
    return dateFormat.parse(dateString);
  }

  private static String formatDate(Date date) {
    return dateFormat.format(date);
  }
}




Java Source Code List

com.google.wireless.speed.speedometer.AboutActivity.java
com.google.wireless.speed.speedometer.AccountSelector.java
com.google.wireless.speed.speedometer.BatteryCapPowerManager.java
com.google.wireless.speed.speedometer.Checkin.java
com.google.wireless.speed.speedometer.Config.java
com.google.wireless.speed.speedometer.DeviceInfo.java
com.google.wireless.speed.speedometer.DeviceProperty.java
com.google.wireless.speed.speedometer.Logger.java
com.google.wireless.speed.speedometer.MeasurementCreationActivity.java
com.google.wireless.speed.speedometer.MeasurementDesc.java
com.google.wireless.speed.speedometer.MeasurementError.java
com.google.wireless.speed.speedometer.MeasurementResult.java
com.google.wireless.speed.speedometer.MeasurementScheduleConsoleActivity.java
com.google.wireless.speed.speedometer.MeasurementScheduler.java
com.google.wireless.speed.speedometer.MeasurementSkippedException.java
com.google.wireless.speed.speedometer.MeasurementTask.java
com.google.wireless.speed.speedometer.ResultsConsoleActivity.java
com.google.wireless.speed.speedometer.SpeedometerApp.java
com.google.wireless.speed.speedometer.SpeedometerPreferenceActivity.java
com.google.wireless.speed.speedometer.SplashScreenActivity.java
com.google.wireless.speed.speedometer.SystemConsoleActivity.java
com.google.wireless.speed.speedometer.UpdateIntent.java
com.google.wireless.speed.speedometer.WatchdogBootReceiver.java
com.google.wireless.speed.speedometer.measurements.DnsLookupTask.java
com.google.wireless.speed.speedometer.measurements.HttpTask.java
com.google.wireless.speed.speedometer.measurements.PingTask.java
com.google.wireless.speed.speedometer.measurements.TracerouteTask.java
com.google.wireless.speed.speedometer.measurements.UDPBurstTask.java
com.google.wireless.speed.speedometer.util.MeasurementJsonConvertor.java
com.google.wireless.speed.speedometer.util.PhoneUtils.java
com.google.wireless.speed.speedometer.util.Util.java