Android Open Source - MassRoute Stop Predictions Parser

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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.parser;
//  ww  w  .  j  av a  2 s .  c  o  m
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;

import com.custardbelly.massdot.exception.MassRouteParserException;
import com.custardbelly.massdot.model.StopPrediction;
import com.custardbelly.massdot.parser.handler.MassRouteServiceParserHandler;

public class StopPredictionsParser implements IStopPredictionsParser 
{
  private URL service;
  
  public StopPredictionsParser( URL service )
  {
    this.service = service;
  }
  
  public StopPredictionsParser( String service )
  {
    try
    {
      this.service = new URL( service );
    }
    catch( MalformedURLException e )
    {
      throw new RuntimeException( e );
    }
  }
  
  public List<StopPrediction> parse() throws MassRouteParserException
  {
    PredictionsParserHandler handler = new PredictionsParserHandler();
    try
    {
      SAXParserFactory spf = SAXParserFactory.newInstance();
      SAXParser sp = spf.newSAXParser();
      XMLReader reader = sp.getXMLReader();
      reader.setContentHandler( handler );
      InputSource input = new InputSource( service.openStream() );
      reader.parse( input );
      if( handler.hasError() )
      {
        throw new MassRouteParserException( handler.getErrorMessage() );
      }
      return handler.predictions;
    }
    catch( Exception e )
    {
      throw new MassRouteParserException( e.getMessage() );
    }
  }
  
  private class PredictionsParserHandler extends MassRouteServiceParserHandler 
  {  
    private String _stopTag;
    private String _stopTitle;
    public List<StopPrediction> predictions;
    
    public PredictionsParserHandler()
    {
      predictions = new ArrayList<StopPrediction>();
    }
    
    @Override
    public void startElement( String uri, String localName, String qName, Attributes attributes )
    {
      // <predictions> is the top level node. store the stop details to be applied to each prediction.
      if( localName.equalsIgnoreCase( "predictions" ) )
      {
        _stopTag = attributes.getValue( "stopTag" );
        _stopTitle = attributes.getValue( "stopTitle" );
      }
      else if( localName.equalsIgnoreCase( "prediction" ) )
      {
        StopPrediction prediction = new StopPrediction( _stopTag, _stopTitle );
        prediction.setSeconds( Integer.parseInt( attributes.getValue( "seconds" ) ) );
        prediction.setMinutes( Integer.parseInt( attributes.getValue( "minutes" ) ) );
        prediction.setVehicle( attributes.getValue( "vehicle" ) );
        prediction.setBlock( attributes.getValue( "block" ) );
        predictions.add( prediction );
      }
      super.startElement(uri, localName, qName, attributes);
    }
  }
}

Java Source Code List