Android Open Source - Is-It-Here-Yet Abstract Feed 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  .  j a  v a  2s .c o m
 * 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.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StringReader;
import java.net.HttpURLConnection;
import java.net.URL;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import com.sudfiwe.iihy.io.DBResult;
import com.sudfiwe.iihy.util.Filter;
import com.sudfiwe.iihy.util.Filter.FilterType;

/**
 * http://www.nextbus.com/xmlFeedDocs/NextBusXMLFeed.pdf
 */
public abstract class AbstractFeedMapper<E> implements IMapper<E> {

  public static final String URL=
    "http://webservices.nextbus.com/service/publicXMLFeed";
  
  public static final String QUERY_COMMAND=
    "command";
  
  public static final String VALUE_COMMAND_AGENCYLIST=
    "agencyList";
  
  public static final String VALUE_COMMAND_ROUTELIST=
    "routeList";
  
  public static final String VALUE_COMMAND_ROUTECONFIG=
    "routeConfig";
  
  public static final String VALUE_COMMAND_PREDICT=
    "predictions";
  
  public static final String VALUE_COMMAND_VEHLOC=
    "vehicleLocations";
  
  public static final String QUERY_AGENCY="a";
  
  public static final String QUERY_ROUTE="r";
  
  public static final String QUERY_STOP="s";
  
  public static final String QUERY_TIME="t";
  
  private boolean afterFirstQueryComponent;

  protected boolean isAfterFirstQueryComponent() {
    return afterFirstQueryComponent;
  }

  protected void setAfterFirstQueryComponent(boolean afterFirstQueryComponent) {
    this.afterFirstQueryComponent=afterFirstQueryComponent;
  }

  protected String createQuery(
      Filter f,FilterType t,String q) {

    String ret="";

    if (f.contains(t)) {

      if (afterFirstQueryComponent) {
        ret=ret+"&";
      } else {
        ret=ret+"?";
      }

      ret=ret+q+"="+f.getEntry(t);

      afterFirstQueryComponent=true;
    }

    return ret;
  }

  protected Document getXMLFromURL(URL url)
  throws IOException,ParserConfigurationException,SAXException {

    HttpURLConnection urlConnection=
      (HttpURLConnection)url.openConnection();

    BufferedReader in=new BufferedReader(
        new InputStreamReader(urlConnection.getInputStream()));

    StringBuilder xmlBuilder=new StringBuilder();
    String line;

    while ((line=in.readLine())!=null) {
      xmlBuilder.append(line+'\n');
    }

    in.close();
    urlConnection.disconnect();

    InputSource inSrc=new InputSource();
    inSrc.setCharacterStream(new StringReader(
        xmlBuilder.toString()));

    DocumentBuilder builder=
      DocumentBuilderFactory.newInstance().newDocumentBuilder();

    return builder.parse(inSrc);
  }
  
  public DBResult<E> saveItem(E obj,Filter f) {

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

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

    return ret;
  }
}

Java Source Code List

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