tim/prune/function/weather/OWMForecastHandler.java

   1 package tim.prune.function.weather;
   2
   3 import java.util.ArrayList;
   4
   5 import org.xml.sax.Attributes;
   6 import org.xml.sax.SAXException;
   7 import org.xml.sax.helpers.DefaultHandler;
   8
   9
  10 /**
  11  * XML handler for dealing with the XML of weather forecasts
  12  * returned from openweathermap.org (current weather has different structure)
  13  */
  14 public class OWMForecastHandler extends DefaultHandler
  15 {
  16         private String _value = null;
  17         /** The location name */
  18         private String _locName = null;
  19         /** The forecast update time */
  20         private String _updateTime = null;
  21         /** The currently open forecast */
  22         private SingleForecast _forecast = null;
  23         /** List of all the forecasts found so far */
  24         private ArrayList<SingleForecast> _forecastList = new ArrayList<SingleForecast>();
  25
  26
  27         /**
  28          * React to the start of an XML tag
  29          */
  30         public void startElement(String inUri, String inLocalName, String inTagName,
  31                 Attributes inAttributes) throws SAXException
  32         {
  33                 if (inTagName.equals("time")) { // start of a new forecast
  34                         _forecast = new SingleForecast();
  35                         // date, timefrom, timeto
  36                         _forecast.setTime(inAttributes.getValue("day"), inAttributes.getValue("from"), inAttributes.getValue("to"));
  37                 }
  38                 else if (inTagName.equals("symbol")) {
  39                         // numeric code, owm image name, description
  40                         _forecast.setSymbol(inAttributes.getValue("number"), inAttributes.getValue("var"), inAttributes.getValue("name"));
  41                 }
  42                 else if (inTagName.equals("windSpeed")) {
  43                         _forecast.setWindDesc(inAttributes.getValue("name"));
  44                 }
  45                 else if (inTagName.equals("temperature")) {
  46                         _forecast.setTemps(inAttributes.getValue("min"), inAttributes.getValue("max"));
  47                 }
  48                 else if (inTagName.equals("humidity")) {
  49                         _forecast.setHumidity(inAttributes.getValue("value") + inAttributes.getValue("unit"));
  50                 }
  51                 _value = null;
  52                 super.startElement(inUri, inLocalName, inTagName, inAttributes);
  53         }
  54
  55         /**
  56          * React to the end of an XML tag
  57          */
  58         public void endElement(String inUri, String inLocalName, String inTagName)
  59         throws SAXException
  60         {
  61                 if (inTagName.equals("name")) {
  62                         _locName = _value;
  63                 }
  64                 else if (inTagName.equals("lastupdate")) {
  65                         _updateTime = _value;
  66                 }
  67                 else if (inTagName.equals("time"))
  68                 {
  69                         // End of a time tag, add the current forecast to the list
  70                         _forecastList.add(_forecast);
  71                 }
  72                 super.endElement(inUri, inLocalName, inTagName);
  73         }
  74
  75         /**
  76          * React to characters received inside tags
  77          */
  78         public void characters(char[] inCh, int inStart, int inLength)
  79         throws SAXException
  80         {
  81                 String value = new String(inCh, inStart, inLength);
  82                 _value = (_value==null?value:_value+value);
  83                 super.characters(inCh, inStart, inLength);
  84         }
  85
  86         /** @return location name of forecast */
  87         public String getLocationName() {
  88                 return _locName;
  89         }
  90
  91         /** @return update time of forecast */
  92         public String getUpdateTime() {
  93                 return _updateTime;
  94         }
  95
  96         /**
  97          * @return the list of forecasts
  98          */
  99         public ArrayList<SingleForecast> getForecasts() {
 100                 return _forecastList;
 101         }
 102 }