Android Open Source - MassRoute Route Config 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;
/*from  ww w  . j a va 2  s.  com*/
import java.net.MalformedURLException;
import java.net.URL;

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.RouteConfig;
import com.custardbelly.massdot.model.RouteDirection;
import com.custardbelly.massdot.model.RouteStop;
import com.custardbelly.massdot.parser.handler.MassRouteServiceParserHandler;

public class RouteConfigParser implements IRouteConfigParser 
{
  private URL service;
  
  public RouteConfigParser( URL service )
  {
    this.service = service;
  }
  
  public RouteConfigParser( String service )
  {
    try
    {
      this.service = new URL( service );
    }
    catch( MalformedURLException e )
    {
      throw new RuntimeException( e );
    }
  }
  
  public RouteConfig parse() throws MassRouteParserException
  {
    RouteConfigParserHandler handler = new RouteConfigParserHandler();
    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.config;
    }
    catch( Exception e )
    {
      throw new MassRouteParserException( e.getMessage() );
    }
  }
  
  private class RouteConfigParserHandler extends MassRouteServiceParserHandler
  {  
    public RouteConfig config;
    
    private boolean _isInspectingDirection;
    private RouteDirection _currentDirection;

    public RouteConfigParserHandler()
    {
      config = new RouteConfig();
    }
    
    @Override
    public void startElement( String uri, String localName, String qName, Attributes attributes )
    {
      if( localName.equalsIgnoreCase( "route" ) )
      {
        config.setTag( attributes.getValue( "tag" ) );
        config.setTitle( attributes.getValue( "title" ) );
      }
      else if( localName.equalsIgnoreCase( "stop" ) )
      {
        RouteStop stop;
        if( !_isInspectingDirection )
        {
          stop = new RouteStop( attributes.getValue( "tag" ), attributes.getValue( "title" ) );
          stop.setDirectionTag( attributes.getValue("dirTag") );
          stop.setStopId( attributes.getValue("stopId") );
          stop.setLatitude( attributes.getValue( "lat") );
          stop.setLongitude( attributes.getValue( "lon") );
          config.addStop( stop );
        }
        else if( _isInspectingDirection && _currentDirection != null )
        {
          stop = new RouteStop( attributes.getValue( "tag" ) );
          _currentDirection.addStop( stop );
        }
      }
      else if( localName.equalsIgnoreCase( "direction") )
      {
        _isInspectingDirection = true;
        _currentDirection = new RouteDirection( attributes.getValue( "tag" ), attributes.getValue( "title" ), attributes.getValue( "name" ) );
        
        config.addDirection( _currentDirection );
      }
      super.startElement(uri, localName, qName, attributes);
    }
    
    @Override
    public void endElement( String uri, String localName, String name)
    {
      if( localName.equalsIgnoreCase( "direction" ) && _isInspectingDirection )
      {
        _isInspectingDirection = false;
        // TODO: find if correct garbage collection.
        _currentDirection = null;
      }
    }
  }
}

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