BusStops.java

package org.djd.busntrain.bus;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.TreeMap;

import org.djd.busntrain.commons.XmlUtil;
import org.djd.busntrain.commons.XmlUtilException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import android.util.Log;

public class BusStops {

  private static final String TAG = BusStops.class.getSimpleName();
  private static final String STOP_ELEMENT = "stop";

  /**
   * @param stopsNodeList contain <stop> elements
   * @return
   * @throws XmlUtilException
   */
  public static ArrayList<Stop> parseValue(String stopsXmlTxt) throws XmlUtilException {

    Document document = XmlUtil.unmarshall(stopsXmlTxt);
    NodeList stopsNodeList = document.getElementsByTagName(STOP_ELEMENT);

    final int STOP_COUNT = stopsNodeList.getLength();

    Log.i(TAG, String.format("STOP_COUNT=%d", STOP_COUNT));
    ArrayList<Stop> stops = new ArrayList<Stop>(STOP_COUNT);

    for (int i = 0; i < STOP_COUNT; i++) {
      Node stopNode = stopsNodeList.item(i);
      Stop stop = new Stop(stopNode);
      stops.add(stop);

    }

    return stops;

  }

  public static class Helper {
    public static ArrayList<Stop> sort(Stop.NameKey sortKey, ArrayList<Stop> stops) {
      TreeMap<String, Stop> sortedMap = new TreeMap<String, Stop>();
      for (Stop stop : stops) {
        sortedMap.put(stop.getByNameKey(sortKey), stop);
      }

      stops.clear();
      for (String key : sortedMap.keySet()) {
        stops.add(sortedMap.get(key));
      }

      return stops;
    }
  }

  public static class Stop extends HashMap<String, String> {

    /**
     *
     */
    private static final long serialVersionUID = -8853781666477277978L;

    enum NameKey {
      STOP_ID("stpid"), STOP_NAME("stpnm"), LATITUDE("lat"), LONGITUDE("lon");
      private String text;

      private NameKey(String text) {
        this.text = text;
      }

    }

    public static final String[] COLUMNS = new String[]{NameKey.STOP_ID.text, NameKey.STOP_NAME.text};

    /**
     * @param nodeList should contain two elements
     */
    Stop(Node stopNode) {
      Element element = (Element) stopNode;
      for (NameKey nameKey : NameKey.values()) {

        String value = XmlUtil.getValue(element, nameKey.text);

        put(nameKey.text, value);
      }
    }

    /**
     * convenience method, same effect as get(key)
     *
     * @param nameKey
     * @return
     */
    public String getByNameKey(NameKey nameKey) {
      return get(nameKey.text);
    }

  }

}