vcs.maemo.org Git - marketstoday/blob - src/qml/Library/js/CoreLogic.js

   1 /*
   2 @version: 0.4
   3 @author: Sudheer K. <scifi1947 at gmail.com>
   4 @license: GNU General Public License
   5 */
   6
   7 var strErrorMessage;
   8
   9 function reloadQuotes(){
  10     var query = getQuery();
  11     if (query){
  12         quoteRefreshStarted();
  13         logUtility.logMessage("Reloading Data..");
  14
  15         //var queryURL = 'http://query.yahooapis.com/v1/public/yql?q=select * from yahoo.finance.quotes where symbol in ("INDU","^IXIC","^GSPC","CLJ11.NYM","YHOO","AAPL","GOOG","MSFT")&env=store://datatables.org/alltableswithkeys';
  16         var queryURL = 'http://query.yahooapis.com/v1/public/yql?q=select Symbol,Name,LastTradePriceOnly,Change,ChangeinPercent,Volume,MarketCapitalization from yahoo.finance.quotes where symbol in ('+query+')&env=store://datatables.org/alltableswithkeys';
  17         logUtility.logMessage(queryURL);
  18
  19         var response = new XMLHttpRequest();
  20         response.onreadystatechange = function() {
  21             if (response.readyState == XMLHttpRequest.DONE) {
  22                 var success = refreshDataModel(response);
  23                 if (success === true){
  24                     logUtility.logMessage("Data Reload Completed..");
  25                 }
  26                 else{
  27                     logUtility.logMessage("Data Reload Failed..");
  28                 }
  29                 quoteRefreshCompleted(success,strErrorMessage);
  30             }
  31         }
  32
  33         response.open("GET", queryURL);
  34         response.send();
  35     }
  36     else{
  37         logUtility.logMessage("No stock symbols found in configuration.");
  38         if (!isDesktopWidget)
  39             strErrorMessage = "Tap the title bar to add stock tickers and update settings."
  40         else
  41             strErrorMessage = "Use the widget settings screen to add stock tickers and update configuration."
  42         stockQuoteDataModel.clear();
  43         quoteRefreshCompleted(false,strErrorMessage);
  44     }
  45 }
  46
  47 function getQuery(){
  48     var query;
  49     var symbolsArray = DBUtility.getAllSymbols();
  50     if (symbolsArray && symbolsArray.length > 0){
  51         var i = 0;
  52         for (i = 0; i< symbolsArray.length; i++) {
  53             logUtility.logMessage("Appending "+symbolsArray[i]+ " to Query");
  54
  55             if (!query){
  56                 query = '"'+symbolsArray[i]+'"';
  57             }
  58             else{
  59                 query = query + ',"' + symbolsArray[i]+'"';
  60             }
  61         }
  62     }
  63
  64     return query;
  65 }
  66
  67 function reloadNews(){
  68     if (!rssURL || rssURL == "Unknown") {
  69         logUtility.logMessage("Invalid RSS URL: "+rssURL);
  70     }
  71     else{
  72         logUtility.logMessage("Reloading news from "+rssURL);
  73         //var queryURL = "http://finance.yahoo.com/rss/topfinstories";
  74         logUtility.logMessage(rssURL);
  75         var response = new XMLHttpRequest();
  76         response.onreadystatechange = function() {
  77             if (response.readyState == XMLHttpRequest.DONE) {
  78                 var success = refreshNewsModel(response);
  79                 if (success === true){
  80                     logUtility.logMessage("News Reload Completed..");
  81                 }
  82                 else{
  83                     logUtility.logMessage("News Reload Failed..");
  84                 }
  85                 newsReloadCompleted(success,strErrorMessage);
  86             }
  87         }
  88
  89         response.open("GET", rssURL);
  90         response.send();
  91     }
  92 }
  93
  94 function refreshDataModel(response){
  95     var status = false;
  96     if (!response.responseXML) {
  97         //This shouldn't happen
  98         strErrorMessage = "Error occurred while loading stock quotes."
  99         if (response.responseText)
 100             logUtility.logMessage(response.responseText);
 101         else
 102             logUtility.logMessage("No responseXML for quotes");
 103         return status;
 104     }
 105
 106     var xmlDoc = response.responseXML.documentElement;
 107     var results = xmlDoc.firstChild;
 108
 109     //Not the best code I ever wrote, but got no choice
 110     //Refer to Memory leak issue with XMLListModel --> http://bugreports.qt.nokia.com/browse/QTBUG-15191
 111
 112     if (results) {
 113         var quoteNodes = results.childNodes;
 114         if (quoteNodes && quoteNodes.length > 0){
 115             logUtility.logMessage("Clearing Data Model");
 116             stockQuoteDataModel.clear();
 117
 118             var i = 0;
 119             for (i = 0; i < quoteNodes.length; i++) {
 120
 121                 var quoteElements = quoteNodes[i].childNodes;
 122                 var j = 0;
 123                 var symbol,stockName,lastTradedPrice,change,changePercentage,volume,marketCap
 124
 125                 for (j = 0; j < quoteElements.length; j++){
 126
 127                     switch (quoteElements[j].nodeName){
 128                         case 'Symbol':
 129                             symbol = quoteElements[j].childNodes[0].nodeValue;
 130                             break;
 131                         case 'Name':
 132                             stockName = quoteElements[j].childNodes[0].nodeValue;
 133                             break;
 134                         case 'LastTradePriceOnly':
 135                             lastTradedPrice = quoteElements[j].childNodes[0].nodeValue;
 136                             break;
 137                         case 'Change':
 138                             change = (quoteElements[j].childNodes[0])? quoteElements[j].childNodes[0].nodeValue:"";
 139                             break;
 140                         case 'ChangeinPercent':
 141                             changePercentage = (quoteElements[j].childNodes[0])? quoteElements[j].childNodes[0].nodeValue:"";
 142                             break;
 143                         case 'Volume':
 144                             volume = (quoteElements[j].childNodes[0])? quoteElements[j].childNodes[0].nodeValue:"";
 145                             break;
 146                         case 'MarketCapitalization':
 147                             marketCap = (quoteElements[j].childNodes[0])? quoteElements[j].childNodes[0].nodeValue:"";
 148                             break;
 149                         default:
 150                     }
 151                 }
 152                 stockQuoteDataModel.append({"symbol":symbol,"stockName":stockName,"lastTradedPrice":lastTradedPrice,"change":change,"changePercentage":changePercentage,"volume":volume,"marketCap":marketCap});
 153                 //logUtility.logMessage("Symbol: "+stockQuoteDataModel.get(i).symbol+", Name: "+ stockQuoteDataModel.get(i).stockName+", LastTraded: "+stockQuoteDataModel.get(i).lastTradedPrice+", Change: "+stockQuoteDataModel.get(i).change+", ChangePercent: "+stockQuoteDataModel.get(i).changePercentage+", Volume: "+stockQuoteDataModel.get(i).volume+", MarketCap: "+stockQuoteDataModel.get(i).marketCap);
 154                 logUtility.logMessage(stockQuoteDataModel.get(i).symbol+", "+stockQuoteDataModel.get(i).lastTradedPrice+", "+stockQuoteDataModel.get(i).change+", "+stockQuoteDataModel.get(i).changePercentage+", "+stockQuoteDataModel.get(i).volume+", "+stockQuoteDataModel.get(i).marketCap);
 155             }
 156
 157             status = true;
 158         }
 159         else
 160         {
 161             strErrorMessage = "Quotes could not be fetched from Yahoo! Finance. Please verify the tickers and try again later."
 162             logUtility.logMessage(response.responseText);
 163             status = false;
 164         }
 165     }
 166     else{
 167         strErrorMessage = "Stock quote data from Yahoo! Finance is currently not available. Please try again later."
 168         logUtility.logMessage(response.responseText);
 169         status = false;
 170     }
 171
 172
 173     var queryNode = xmlDoc;
 174     if (queryNode) {
 175         i = 0;
 176         var queryAttributes = queryNode.attributes;
 177         for (i = 0; i < queryAttributes.length; i++) {
 178             if (queryAttributes[i].name == 'created') {
 179                 lastUpdatedTimeStamp = "Updated: "+DateLib.ISODate.format(queryAttributes[i].value);
 180                 logUtility.logMessage(lastUpdatedTimeStamp);
 181                 break;
 182             }
 183         }
 184     }
 185
 186     return status;
 187 }
 188
 189 function refreshNewsModel(response){
 190     var status = false;
 191     if (!response.responseXML) {
 192         //This shouldn't happen
 193         strErrorMessage = "Error occurred while loading news."
 194         if (response.responseText)
 195             logUtility.logMessage(response.responseText);
 196         else
 197             logUtility.logMessage("No responseXML for news");
 198         return status;
 199     }
 200
 201     //Not the best code I ever wrote, but got no choice
 202     //Refer to Memory leak issue with XMLListModel --> http://bugreports.qt.nokia.com/browse/QTBUG-15191
 203
 204
 205     var xmlDoc = response.responseXML.documentElement;
 206     //var channel = xmlDoc.firstChild; Doesn't work with some RSS providers. THANK YOU, YAHOO
 207
 208     var channel;
 209
 210     var i = 0;
 211     for (i = 0; i < xmlDoc.childNodes.length; i++){
 212         if (xmlDoc.childNodes[i].nodeName === 'channel') {
 213             channel = xmlDoc.childNodes[i];
 214             break;
 215         }
 216     }
 217
 218     if (channel) {
 219         var itemNodes = channel.childNodes;
 220         if (itemNodes){
 221
 222             logUtility.logMessage("Clearing News Model");
 223             newsDataModel.clear();
 224             logUtility.logMessage("No. of news stories = "+itemNodes.length);
 225
 226             for (i = 0; i < itemNodes.length; i++) {
 227                 if (itemNodes[i].nodeName === 'item'){
 228                     var newsElements = itemNodes[i].childNodes;
 229                     var j = 0;
 230                     var newsTitle,newsLink
 231                     for (j = 0; j < newsElements.length; j++){
 232
 233                         switch (newsElements[j].nodeName){
 234                             case 'title':
 235                                 newsTitle = newsElements[j].childNodes[0].nodeValue;
 236                                 break;
 237                             case 'link':
 238                                 newsLink = newsElements[j].childNodes[0].nodeValue;
 239                                 break;
 240                             default:
 241                         }
 242                     }
 243                     newsDataModel.append({"title":newsTitle,"link":newsLink});
 244                     //logUtility.logMessage("Title: "+newsDataModel.get(i).title+", Link: "+ newsDataModel.get(i).link);
 245                     //logUtility.logMessage("Title: "+newsTitle+", Link: "+ newsLink);
 246                 }
 247             }
 248             status = true;
 249         }
 250         else{
 251             strErrorMessage = "The RSS feed did not contain any news stories. Please try again later."
 252             logUtility.logMessage(response.responseText);
 253             status = false;
 254         }
 255     }
 256     else{
 257         strErrorMessage = "The RSS feed did not return valid data. Please check the URL and try again later."
 258         logUtility.logMessage(response.responseText);
 259         status = false;
 260     }
 261
 262     return status;
 263 }
 264
 265 function loadSettings(){
 266     var value;
 267     value  = DBUtility.getSetting("UpdateFreqency");
 268     if (!value || value == "0.0" || value === "" || isNaN(value)){
 269         autoUpdateInterval = 0;
 270     }
 271     else{
 272         autoUpdateInterval = parseInt(value)*60*1000; //Convert minutes to milliseconds
 273     }
 274     value  = DBUtility.getSetting("UpdateWeekdaysOnly");
 275     if (!value || value == "0.0" || value === ""){
 276         updateWeekDaysOnly = false;
 277     }
 278     else{
 279         updateWeekDaysOnly = true;
 280     }
 281
 282 /*
 283     value  = DBUtility.getSetting("UpdateOnSavedNetworksOnly");
 284     if (!value || value == "0.0" || value === ""){
 285         updateOnSavedNetworksOnly = false;
 286     }
 287     else{
 288         updateOnSavedNetworksOnly = true;
 289     }
 290 */
 291
 292     value  = DBUtility.getSetting("RSSURL");
 293     if (!value || value == "Unknown" || value === ""){
 294         //Do Nothing
 295     }
 296     else if (value === 'http://finance.yahoo.com/rss/topstories'){
 297         /*
 298           Yahoo changed their Top New rss feed from http://finance.yahoo.com/rss/topstories to http://finance.yahoo.com/rss/topfinstories.
 299           Since the application has a hardcoded default rss feed, it is better to update it here. Not sure if this is the best way to deal with such changes.
 300          */
 301
 302             rssURL = "http://finance.yahoo.com/rss/topfinstories";
 303             DBUtility.setSetting("RSSURL",rssURL);
 304     }
 305     else
 306     {
 307         rssURL = value;
 308     }
 309 }
 310
 311 function initialize(){
 312     if (autoUpdateTimer.running) autoUpdateTimer.stop();
 313     loadSettings();
 314     reloadQuotes();
 315     reloadNews();
 316
 317     if (autoUpdateInterval !== 0) {
 318         logUtility.logMessage("Starting Timer..");
 319         autoUpdateTimer.start();
 320     }
 321 }