Android Open Source - MassRoute Stop Prediction Task

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Back to project page MassRoute.

License

The source code is released under:

Copyright (c) 2010 Todd Anderson http://www.custardbelly.com/blog Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (th...

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Java Source Code

package com.custardbelly.massdot.service;
/*  w ww.j  ava2 s . c  om*/
import java.lang.ref.WeakReference;
import java.net.URL;
import java.util.List;

import android.os.AsyncTask;

import com.custardbelly.massdot.exception.MassRouteParserException;
import com.custardbelly.massdot.model.StopPrediction;
import com.custardbelly.massdot.parser.IStopPredictionsParser;
import com.custardbelly.massdot.parser.StopPredictionsParser;
import com.custardbelly.massdot.service.responder.IStopPredictionsServiceResponder;

public class StopPredictionTask extends AsyncTask<URL, Integer, Long> implements IQueueableTask
{
  private List<StopPrediction> _predictions;
  private String _errorMessage;
  private WeakReference<IStopPredictionsServiceResponder> _responder;
  private WeakReference<IQueueableTaskResponder> _queuedResponder;
  
  public StopPredictionTask( IStopPredictionsServiceResponder responder )
  {
    _responder = new WeakReference<IStopPredictionsServiceResponder>( responder );
  }
  
  public StopPredictionTask( IStopPredictionsServiceResponder responder, IQueueableTaskResponder queuedResponder )
  {
    _responder = new WeakReference<IStopPredictionsServiceResponder>( responder );
    _queuedResponder = new WeakReference<IQueueableTaskResponder>( queuedResponder );
  }
  
  @Override
  protected Long doInBackground(URL... urls) 
  {
    URL serviceUrl = urls[0];
    final IStopPredictionsParser parser = new StopPredictionsParser( serviceUrl );
    try
    {
      _predictions = parser.parse();
    }
    catch( MassRouteParserException e )
    {
      _errorMessage = e.getMessage();
    }
    return null;
  }

  @Override
  protected void onPostExecute( Long result )
  {
    IStopPredictionsServiceResponder serviceResponder = getResponder();
    IQueueableTaskResponder taskResponder = getQueueableResponder();
    if( _predictions != null )
    {
      serviceResponder.handleServiceResult( _predictions );
      if( taskResponder != null ) taskResponder.handleQueueableTaskResult();
    }
    else
    {
      // TODO: pull default message from resource.
      String message = ( _errorMessage != null ) ? _errorMessage : "Could not retrieve predictions available.\nPlease try again at a later time."; 
      serviceResponder.handleServiceFault( message );
      if( taskResponder != null ) taskResponder.handleQueueableTaskFault();
    }
  }
  
  public IStopPredictionsServiceResponder getResponder()
  {
    return _responder.get();
  }
  public void setResponder( IStopPredictionsServiceResponder responder )
  {
    _responder = new WeakReference<IStopPredictionsServiceResponder>( responder );
  }
  
  public IQueueableTaskResponder getQueueableResponder()
  {
    return _queuedResponder.get();
  }
  public void setQueuedResponder( IQueueableTaskResponder responder )
  {
    _queuedResponder = new WeakReference<IQueueableTaskResponder>( responder );
  }
}

Java Source Code List