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

   1 /*
   2 @version: 0.2
   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         strErrorMessage = "Tap the title bar to add stock tickers and update settings."
  39         stockQuoteDataModel.clear();
  40         quoteRefreshCompleted(false,strErrorMessage);
  41     }
  42 }
  43
  44 function getQuery(){
  45     var query;
  46     var symbolsArray = DBUtility.getAllSymbols();
  47     if (symbolsArray && symbolsArray.length > 0){
  48         var i = 0;
  49         for (i = 0; i< symbolsArray.length; i++) {
  50             logUtility.logMessage("Appending "+symbolsArray[i]+ " to Query");
  51
  52             if (!query){
  53                 query = '"'+symbolsArray[i]+'"';
  54             }
  55             else{
  56                 query = query + ',"' + symbolsArray[i]+'"';
  57             }
  58         }
  59     }
  60
  61     return query;
  62 }
  63
  64 function reloadNews(){
  65     if (!rssURL || rssURL == "Unknown") {
  66         logUtility.logMessage("Invalid RSS URL: "+rssURL);
  67     }
  68     else{
  69         logUtility.logMessage("Reloading news from "+rssURL);
  70         //var queryURL = "http://finance.yahoo.com/rss/topfinstories";
  71         logUtility.logMessage(rssURL);
  72         var response = new XMLHttpRequest();
  73         response.onreadystatechange = function() {
  74             if (response.readyState == XMLHttpRequest.DONE) {
  75                 var success = refreshNewsModel(response);
  76                 if (success === true){
  77                     logUtility.logMessage("News Reload Completed..");
  78                 }
  79                 else{
  80                     logUtility.logMessage("News Reload Failed..");
  81                 }
  82                 newsReloadCompleted(success,strErrorMessage);
  83             }
  84         }
  85
  86         response.open("GET", rssURL);
  87         response.send();
  88     }
  89 }
  90
  91 function refreshDataModel(response){
  92     var status = false;
  93     if (!response.responseXML) {
  94         //This shouldn't happen
  95         strErrorMessage = "Error occurred while loading stock quotes. Please contact the developer."
  96         if (response.responseText)
  97             logUtility.logMessage(response.responseText);
  98         else
  99             logUtility.logMessage("No responseXML for quotes");
 100         return status;
 101     }
 102
 103     var xmlDoc = response.responseXML.documentElement;
 104     var results = xmlDoc.firstChild;
 105
 106     //Not the best code I ever wrote, but got no choice
 107     //Refer to Memory leak issue with XMLListModel --> http://bugreports.qt.nokia.com/browse/QTBUG-15191
 108
 109     if (results) {
 110         var quoteNodes = results.childNodes;
 111         if (quoteNodes && quoteNodes.length > 0){
 112             logUtility.logMessage("Clearing Data Model");
 113             stockQuoteDataModel.clear();
 114
 115             var i = 0;
 116             for (i = 0; i < quoteNodes.length; i++) {
 117
 118                 var quoteElements = quoteNodes[i].childNodes;
 119                 var j = 0;
 120                 var symbol,stockName,lastTradedPrice,change,changePercentage,volume,marketCap
 121
 122                 for (j = 0; j < quoteElements.length; j++){
 123
 124                     switch (quoteElements[j].nodeName){
 125                         case 'Symbol':
 126                             symbol = quoteElements[j].childNodes[0].nodeValue;
 127                             break;
 128                         case 'Name':
 129                             stockName = quoteElements[j].childNodes[0].nodeValue;
 130                             break;
 131                         case 'LastTradePriceOnly':
 132                             lastTradedPrice = quoteElements[j].childNodes[0].nodeValue;
 133                             break;
 134                         case 'Change':
 135                             change = (quoteElements[j].childNodes[0])? quoteElements[j].childNodes[0].nodeValue:"";
 136                             break;
 137                         case 'ChangeinPercent':
 138                             changePercentage = (quoteElements[j].childNodes[0])? quoteElements[j].childNodes[0].nodeValue:"";
 139                             break;
 140                         case 'Volume':
 141                             volume = (quoteElements[j].childNodes[0])? quoteElements[j].childNodes[0].nodeValue:"";
 142                             break;
 143                         case 'MarketCapitalization':
 144                             marketCap = (quoteElements[j].childNodes[0])? quoteElements[j].childNodes[0].nodeValue:"";
 145                             break;
 146                         default:
 147                     }
 148                 }
 149                 stockQuoteDataModel.append({"symbol":symbol,"stockName":stockName,"lastTradedPrice":lastTradedPrice,"change":change,"changePercentage":changePercentage,"volume":volume,"marketCap":marketCap});
 150                 //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);
 151                 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);
 152             }
 153
 154             status = true;
 155         }
 156         else
 157         {
 158             strErrorMessage = "Quotes could not be fetched from Yahoo! Finance. Please verify the tickers and try again later."
 159             logUtility.logMessage(response.responseText);
 160             status = false;
 161         }
 162     }
 163     else{
 164         strErrorMessage = "Stock quote data from Yahoo! Finance is currently not available. Please try again later."
 165         logUtility.logMessage(response.responseText);
 166         status = false;
 167     }
 168
 169
 170     var queryNode = xmlDoc;
 171     if (queryNode) {
 172         i = 0;
 173         var queryAttributes = queryNode.attributes;
 174         for (i = 0; i < queryAttributes.length; i++) {
 175             if (queryAttributes[i].name == 'created') {
 176                 lastUpdatedTimeStamp = "Updated: "+DateLib.ISODate.format(queryAttributes[i].value);
 177                 logUtility.logMessage(lastUpdatedTimeStamp);
 178                 break;
 179             }
 180         }
 181     }
 182
 183     return status;
 184 }
 185
 186 function refreshNewsModel(response){
 187     var status = false;
 188     if (!response.responseXML) {
 189         //This shouldn't happen
 190         strErrorMessage = "Error occurred while loading news. Please contact the developer."
 191         if (response.responseText)
 192             logUtility.logMessage(response.responseText);
 193         else
 194             logUtility.logMessage("No responseXML for news");
 195         return status;
 196     }
 197
 198     //Not the best code I ever wrote, but got no choice
 199     //Refer to Memory leak issue with XMLListModel --> http://bugreports.qt.nokia.com/browse/QTBUG-15191
 200
 201
 202     var xmlDoc = response.responseXML.documentElement;
 203     //var channel = xmlDoc.firstChild; Doesn't work with some RSS providers. THANK YOU, YAHOO
 204
 205     var channel;
 206
 207     var i = 0;
 208     for (i = 0; i < xmlDoc.childNodes.length; i++){
 209         if (xmlDoc.childNodes[i].nodeName === 'channel') {
 210             channel = xmlDoc.childNodes[i];
 211             break;
 212         }
 213     }
 214
 215     if (channel) {
 216         var itemNodes = channel.childNodes;
 217         if (itemNodes){
 218
 219             logUtility.logMessage("Clearing News Model");
 220             newsDataModel.clear();
 221             logUtility.logMessage("No. of news stories = "+itemNodes.length);
 222
 223             for (i = 0; i < itemNodes.length; i++) {
 224                 if (itemNodes[i].nodeName === 'item'){
 225                     var newsElements = itemNodes[i].childNodes;
 226                     var j = 0;
 227                     var newsTitle,newsLink
 228                     for (j = 0; j < newsElements.length; j++){
 229
 230                         switch (newsElements[j].nodeName){
 231                             case 'title':
 232                                 newsTitle = newsElements[j].childNodes[0].nodeValue;
 233                                 break;
 234                             case 'link':
 235                                 newsLink = newsElements[j].childNodes[0].nodeValue;
 236                                 break;
 237                             default:
 238                         }
 239                     }
 240                     newsDataModel.append({"title":newsTitle,"link":newsLink});
 241                     //logUtility.logMessage("Title: "+newsDataModel.get(i).title+", Link: "+ newsDataModel.get(i).link);
 242                     //logUtility.logMessage("Title: "+newsTitle+", Link: "+ newsLink);
 243                 }
 244             }
 245             status = true;
 246         }
 247         else{
 248             strErrorMessage = "The RSS feed did not contain any news stories. Please try again later."
 249             logUtility.logMessage(response.responseText);
 250             status = false;
 251         }
 252     }
 253     else{
 254         strErrorMessage = "The RSS feed did not return valid data. Please check the URL and try again later."
 255         logUtility.logMessage(response.responseText);
 256         status = false;
 257     }
 258
 259     return status;
 260 }
 261
 262 function loadSettings(){
 263     var value;
 264     value  = DBUtility.getSetting("UpdateFreqency");
 265     if (!value || value == "0.0" || value === "" || isNaN(value)){
 266         autoUpdateInterval = 0;
 267     }
 268     else{
 269         autoUpdateInterval = parseInt(value)*60*1000; //Convert minutes to milliseconds
 270     }
 271     value  = DBUtility.getSetting("UpdateWeekdaysOnly");
 272     if (!value || value == "0.0" || value === ""){
 273         updateWeekDaysOnly = false;
 274     }
 275     else{
 276         updateWeekDaysOnly = true;
 277     }
 278
 279 /*
 280     value  = DBUtility.getSetting("UpdateOnSavedNetworksOnly");
 281     if (!value || value == "0.0" || value === ""){
 282         updateOnSavedNetworksOnly = false;
 283     }
 284     else{
 285         updateOnSavedNetworksOnly = true;
 286     }
 287 */
 288
 289     value  = DBUtility.getSetting("RSSURL");
 290     if (!value || value == "Unknown" || value === ""){
 291         //Do Nothing
 292     }
 293     else if (value === 'http://finance.yahoo.com/rss/topstories'){
 294         /*
 295           Yahoo changed their Top New rss feed from http://finance.yahoo.com/rss/topstories to http://finance.yahoo.com/rss/topfinstories.
 296           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.
 297          */
 298
 299             rssURL = "http://finance.yahoo.com/rss/topfinstories";
 300             DBUtility.setSetting("RSSURL",rssURL);
 301     }
 302     else
 303     {
 304         rssURL = value;
 305     }
 306 }
 307
 308 function initialize(){
 309     if (autoUpdateTimer.running) autoUpdateTimer.stop();
 310     loadSettings();
 311     reloadQuotes();
 312     reloadNews();
 313
 314     if (autoUpdateInterval !== 0) {
 315         logUtility.logMessage("Starting Timer..");
 316         autoUpdateTimer.start();
 317     }
 318 }