// Uses Internet Explorer to programmatically retrieve a stock quote
// It shows the techniques of
//   (a) waiting for a page load to complete,
//       This involves registering an event listener to the web browser,
//       and listening to events until the top level frame sends
//       a DocumentComplete event.
// and
//   (b) examining the contents of a page after it has been loaded.
//       There is no general mechanism for this.  This is done on
//       an ad-hoc basis.  The web page source needs to be examined
//       for patterns that can help in locating the item of interest.
//       Below are some examples of how such patterns can be used.

// WARNING:  This sample is provided AS IS.  The web-sites included
// here are as examples only.  The web-site layouts may change, making
// the code below invalid at any time.

import iexplorer.InternetExplorer; 
import iexplorer.IWebBrowserApp;  
import mshtml.IHTMLDocument2;
import mshtml.IHTMLElementCollection;
import mshtml.IHTMLElement;
import ezjcom.JComVariant;
import ezjcom.JComObject;
import java.io.BufferedReader;  
import java.io.InputStreamReader;  

public class StockQuote {  

  public static void main(String args[])  
  {  
    IWebBrowserApp app = null;
    try {  
      // Instantiate an InternetExplorer  
      InternetExplorer ie = new InternetExplorer();  

      // Get IWebBrowserApp  
      app = ie.getIWebBrowserApp();  

      // HINT:  While developing, make the browser visible!! 
      //   app.setVisible( true );  
      // NOTE: When browser is not visible, the following workaround must
      // be added for an Internet Explorer bug (http://support.microsoft.com/kb/259935)
      // Remove it or comment it out if setting the browser visible.
      app.setLeft( - app.getWidth());

      // If IE is trying to load any default pages, stop it.  
      app.Stop();  

      // Attach the events listener.
      WebLoadListener webLoadListener = new WebLoadListener();
      ie.addJComEventListener( webLoadListener );

      // Get a buffered reader to read user input.  
      BufferedReader in = new BufferedReader(  
                 new InputStreamReader( System.in ));  

      // Note:  The same instance of IE is used for all quotes,
      // to avoid the delay of IE initialization.

      for (;;) {  
        System.out.println( "  1)  MSN Money Stock Quote" );
        System.out.println( "  2)  Bloomberg Stock Quote" );
        System.out.println( "  3)  Google Finance Stock Quote" );
        System.out.println( "  4)  Yahoo Finance Stock Quote" );
        System.out.println( "  5)  Quit" );
        System.out.print( "Enter Command Number: " );

        String cmd = in.readLine().trim(); 
        if ( cmd.equals( "5" ))
          break;
        if ( ! ( cmd.equals( "1" ) || cmd.equals( "2" ) ||
                 cmd.equals( "3" ) || cmd.equals( "4" )))
          continue;
        System.out.print( "Enter Stock Symbol> " );  
        // Get Stock Symbol 
        String stock = in.readLine().trim();
        if ( stock.equals(""))
            continue;
        String url = "";
        if ( cmd.equals( "1" ))
          url = "http://moneycentral.msn.com/detail/stock_quote?Symbol=";
        else if ( cmd.equals( "2" ))
          url = "http://www.bloomberg.com/apps/quote?ticker=";
        else if ( cmd.equals( "3" ))
          url = "http://finance.google.com/finance?q=";
        else if ( cmd.equals( "4" ))
          url = "http://finance.yahoo.com/q?s=";
        url += stock;
        if ( cmd.equals( "2" ) && stock.indexOf( ':' ) < 0 )
          url += ":US";

        // Tell browser to load the Stock Quote from website, and wait for load completion.
        System.out.println( "Retrieving " + url );
        webLoadListener.initialize();
        synchronized ( webLoadListener ) {
            app.Navigate( url );
            webLoadListener.wait();
        }
        System.out.println( "Examining contents of " + url );

        // Now retrieve and examine the contents of the website.
        IHTMLDocument2 doc = (IHTMLDocument2)
                 app.getDocument().JComCoerceObjectToAnotherType( IHTMLDocument2.class );
        IHTMLElementCollection all = doc.getAll();
        // Process the collection, depending upon the web-site.
        String price = null;
        String source = null;

        // Ad-hoc parsing of the four sites of interest.

        if ( cmd.equals( "1" )) {
            // MSN Money
            // For MSN Money, the stock price is the first "s1" element.

            source = "MSN Money";
            for ( int i = 0; i < all.getLength(); i++ ) {
                JComObject obj = all.item( new JComVariant( i ));
                IHTMLElement elem = (IHTMLElement)
                    obj.JComCoerceObjectToAnotherType( IHTMLElement.class );
                if ( "s1".equals( elem.getClassName())) {
                    price = elem.getInnerText().trim();
                    break;
                }
            }
        } else if ( cmd.equals( "2" )) {
            // Bloomberg
            // For Bloomberg, the stock price is in the second "QuoteTableData" style element.

            source = "Bloomberg";
            int count = 0;
            for ( int i = 0; i < all.getLength(); i++ ) {
                JComObject obj = all.item( new JComVariant( i ));
                IHTMLElement elem = (IHTMLElement)
                    obj.JComCoerceObjectToAnotherType( IHTMLElement.class );
                if ( "QuoteTableData".equals( elem.getClassName())) {
                    if ( ++count == 2 ) {
                        price = elem.getInnerText().trim();
                        break;
                    }
                }
            }
        } else if ( cmd.equals( "3" )) {
            // Google Finance
            // For Google Finance, the stock price is in the first "SPAN" that has a non-null ID.

            source = "Google Finance";
            for ( int i = 0; i < all.getLength(); i++ ) {
            JComObject obj = all.item( new JComVariant( i ));
                IHTMLElement elem = (IHTMLElement)
                    obj.JComCoerceObjectToAnotherType( IHTMLElement.class );
                if ( elem.getTagName().equalsIgnoreCase( "SPAN" ) &&
                     elem.getId() != null ) {
                    price = elem.getInnerText().trim();
                    break;
                }
            }
        } else if ( cmd.equals( "4" )) {
            // Yahoo Finance
            // For Yahoo Finance, the stock price is in the second "SPAN" with an id
            // that ends with an underscore and the stock name.

            source = "Yahoo Finance";
            String stkLwr = "_" + stock.toLowerCase();
            int count = 0;
            for ( int i = 0; i < all.getLength(); i++ ) {
                JComObject obj = all.item( new JComVariant( i ));
                IHTMLElement elem = (IHTMLElement)
                    obj.JComCoerceObjectToAnotherType( IHTMLElement.class );
                if ( elem.getTagName().equalsIgnoreCase( "SPAN" ) &&
                     elem.getId() != null && elem.getId().toLowerCase().endsWith( stkLwr )) {
                    if ( ++count == 2 ) {
                        price = elem.getInnerText().trim();
                        break;
                    }
                }
            }
        }
        System.out.println();
        if ( price == null )
            System.out.println( source + " could not find a price for " + stock );
        else
            System.out.println( "According to " + source + ", the last price of " +
                                 stock + " was " + price );
        System.out.println();

      }  
    } catch (Exception ex) {  
      ex.printStackTrace();  
    } finally {
      if ( app != null ) try {
        app.Quit();
      } catch (Exception ex) {}
    }
    System.exit( 0 );
  }  
}