Android Open Source - Is-It-Here-Yet Prediction List Mapper

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * Is It Here Yet? is a simple Android application that reads the
 * NextBus public XML feed and displays the arrival times for
 * transit vehicles for a chosen stop. //  w w  w . ja  va  2  s  .  c om
 * Copyright (C) 2011 Matthew Lam
 *
 * Is It Here Yet? is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Is It Here Yet? is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with Is It Here Yet?.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.sudfiwe.iihy.io.mapper;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Hashtable;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import com.sudfiwe.iihy.data.predict.Prediction;
import com.sudfiwe.iihy.data.predict.PredictionDirection;
import com.sudfiwe.iihy.data.predict.PredictionList;
import com.sudfiwe.iihy.io.DBResult;
import com.sudfiwe.iihy.uiinterface.IPredictionDirection;
import com.sudfiwe.iihy.uiinterface.IPredictionItem;
import com.sudfiwe.iihy.util.Filter;
import com.sudfiwe.iihy.util.Filter.FilterType;

public class PredictionListMapper extends AbstractFeedMapper<PredictionList> {

  public DBResult<PredictionList> getList(Filter f) {

    DBResult<PredictionList> ret=
      new DBResult<PredictionList>();

    String url=AbstractFeedMapper.URL+"?"+
    AbstractFeedMapper.QUERY_COMMAND+"="+
    AbstractFeedMapper.VALUE_COMMAND_PREDICT;

    this.setAfterFirstQueryComponent(true);
    url=url+
    this.createQuery(f,FilterType.PREDICT_AGENCYTAG,
        AbstractFeedMapper.QUERY_AGENCY)+
        this.createQuery(f,FilterType.PREDICT_ROUTETAG,
            AbstractFeedMapper.QUERY_ROUTE)+
            this.createQuery(f,FilterType.PREDICT_STOPTAG,
                AbstractFeedMapper.QUERY_STOP);

    URL nextBusURL;;
    try {
      
      Calendar requestTime=Calendar.getInstance();
      
      nextBusURL=new URL(url);

      Document doc=this.getXMLFromURL(nextBusURL);

      Element root=doc.getDocumentElement();

      if (root.getTagName().equals("body")) {

        Hashtable<IPredictionDirection,IPredictionItem[]> table=new Hashtable<IPredictionDirection,IPredictionItem[]>();

        String message="";

        NodeList bodyChildren=root.getElementsByTagName(
        "predictions");

        for (int bodyNodeIndex=0;bodyNodeIndex<
        bodyChildren.getLength();bodyNodeIndex++) {

          Element routeElement=
            (Element)bodyChildren.item(
                bodyNodeIndex);

          NodeList routeDirChildren=
            routeElement.getElementsByTagName(
            "direction");

          for (int routeDirNodeIndex=0;routeDirNodeIndex<
          routeDirChildren.getLength();routeDirNodeIndex++) {

            Element dirElement=
              (Element)routeDirChildren.item(
                  routeDirNodeIndex);

            String title=
              dirElement.getAttribute("title");

            PredictionDirection predictDir=
              new PredictionDirection(title);

            NodeList dirChildren=dirElement.getElementsByTagName(
            "prediction");

            ArrayList<Prediction> predictItems=
              new ArrayList<Prediction>();

            for (int dirStopNodeIndex=0;dirStopNodeIndex<
            dirChildren.getLength();dirStopNodeIndex++) {

              Element predictElement=
                (Element)dirChildren.item(
                    dirStopNodeIndex);

              String dirTag=predictElement.getAttribute("dirTag");

              boolean doIt=true;
              if (f.contains(FilterType.PREDICT_DIRTAG)&&
                  !f.getEntry(FilterType.PREDICT_DIRTAG).equals(dirTag)) {
                doIt=false;
              }

              if (doIt) {
                
                int minutes=Integer.parseInt(
                    predictElement.getAttribute("minutes"));
                
                Calendar arrival=(Calendar)requestTime.clone();
                arrival.add(Calendar.MINUTE,minutes);
                
                boolean isDeparture=Boolean.parseBoolean(
                    predictElement.getAttribute("isDeparture"));
                String vehicle=predictElement.getAttribute("vehicle");

                predictItems.add(new Prediction(arrival,
                    isDeparture,vehicle));
              }
            }

            if (predictItems.size()>0) {
              table.put(predictDir,predictItems.toArray(
                  new Prediction[predictItems.size()]));
            }
          }

          PredictionList list=new PredictionList(table,
              message);

          ret.setSuccess(true);
          ret.setObject(list);
        }
      }
    } catch (MalformedURLException e) {
      ret.setSuccess(false);
      ret.setMessage(e.getMessage());
    } catch (IOException e) {
      ret.setSuccess(false);
      ret.setMessage(e.getMessage());
    } catch (ParserConfigurationException e) {
      ret.setSuccess(false);
      ret.setMessage(e.getMessage());
    } catch (SAXException e) {
      ret.setSuccess(false);
      ret.setMessage(e.getMessage());
    }

    return ret;
  }

  public DBResult<PredictionList> getItem(Filter f) {

    DBResult<PredictionList> ret=new DBResult<PredictionList>();

    ret.setMessage("Feature not implemented.");

    return ret;
  }
}

Java Source Code List

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