stockmidlet.java

一个非常全面的手机性能测试项目

        try {
            stocks.delete(tkrSymbol);
            alerts.removeUselessAlerts(tkrSymbol);
            stockTicker.setString(makeTickerString());
        } catch (RecordStoreException rs) {
            error("Failed to delete " + tkrSymbol, 2000);
        }
    }

    /**
     * <p>Show the about box with copyright info and image</p>
     */
    private void about() {
        Runtime runtime = Runtime.getRuntime();

        StringBuffer props = new StringBuffer();
        props.append("\nSystem Properties\n");
        props.append("Used Memory = " 
		     + (runtime.totalMemory() - runtime.freeMemory()) + "\n");
        props.append("Garbage collecting . . .\n");

        runtime.gc();
        long free = runtime.freeMemory();
        long total = runtime.totalMemory();

        props.append("Used Memory = " + (total - free) + "\n");
        props.append("Free Memory = " + free + "\n");
        props.append("Total Memory = " + total + "\n");
        System.out.println(props.toString());
        example.About.showAbout(display);
    }

    /**
     * <p>This class is the Listener for ALL of the events that
     * take place during
     * life span of the <code>MIDlet</code>.  It handles <code>Command</code>
     * events and list selections which are the only events that this
     * <code>MIDlet</code> will generate.  In order to determine what to do,
     * the Listener checks the name of the command and the currently displayed
     * menu/list and matches them up to execute the appropriate action.</p>
     * <BR>
     * NOTE: The parseCommandString(String) is only there because the getXXX
     *       methods are missing from the Command class.  When they are added,
     *       this method can be removed and the Command.getLabel() can be used
     */

    private class StockCommandListener implements CommandListener {

        /**
         * <p>The method to determine what action to take</p>
         *
         * @param c The <code>Command</code> object that has been activated
         * @param d The <code>Displayable</code> object that the command was
         *          associated with
         */
        public void commandAction(Command c, Displayable d) {
            String type = c.getLabel();

            // Main command executed, always show Main Menu regardless of
	    // which screen is showing
            if (type.equals("Main")) {
                mainMenu();

		// Back command executed, check which screen is and move to
		// the previous one
            } else if (type.equals("Back")) {

                // Screens off the Main Menu
                if (currentMenu.equals("View")           ||
                        currentMenu.equals("WhatChoose") ||
                        currentMenu.equals("AlertMenu")  ||
                        currentMenu.equals("Settings")) {
                    mainMenu();

                // Screens off the Settings menu
                } else if (currentMenu.equals("Add")     ||
                           currentMenu.equals("Updates") ||
                           currentMenu.equals("RemoveStock")) {
                    settings(false);
                } else if (currentMenu.equals("stockInfo")) {
                    chooseStock(false, "View", Choice.IMPLICIT, true);
                } else if (currentMenu.equals("WhatIfForm")) {
                    chooseStock(false, "WhatChoose", Choice.IMPLICIT, false);
                } else if (currentMenu.equals("AlertForm")) {
                    chooseStock(false, "AddAlert", Choice.IMPLICIT, false);
                } else if (currentMenu.equals("AnswerForm")) {
                    whatIfForm(stockSymbol);

                // Screens off the Alerts menu
                } else if (currentMenu.equals("RemoveAlert") ||
                           currentMenu.equals("AddAlert")) {
                    alertMenu(false);
                } else if (currentMenu.equals("AddStock")) {
                    settings(false);
                }

		// OK command executed, perform different actions depending on
		// which screen is showing
            } else if (type.equals("Done")) {
                if (currentMenu.equals("AddStock")) {
                    if (!stockSymbolBox.getString().equals("") &&
			addNewStock(stockSymbolBox.getString())) {
                            settings(true);
                    }
                } else if (currentMenu.equals("AlertForm")) {
                    setAlert(((TextBox)d).getString());
                    alertMenu(true);

                // Remove an alert
                } else if (currentMenu.equals("RemoveAlert")) {
                    boolean[] chosen = new boolean[choose.size()];
                    choose.getSelectedFlags(chosen);
                    for (int i = 0; i < chosen.length; i++) {
                        if (chosen[i]) {
                            removeAlert(choose.getString(i));
                        }
                    }
                    alertMenu(true);

                // Remove a Stock
                } else if (currentMenu.equals("RemoveStock")) {
                    boolean[] chosen = new boolean[choose.size()];
                    choose.getSelectedFlags(chosen);
                    for (int i = 0; i < chosen.length; i++) {
                        if (chosen[i]) {
                            deleteStock(choose.getString(i));
                        }
                    }
                    chosen = null;
                    settings(true);

                // Set the quote update interval
                } else if (currentMenu.equals("Updates")) {
                    switch (updatesChoices.getSelectedIndex()) {
                        case 0:
                            refresh_interval =    30000;
                            break;
                        case 1:
                            refresh_interval =   900000;
                            break;
                        case 2:
                            refresh_interval =  1800000;
                            break;
                        case 3:
                            refresh_interval =  3600000;
                            break;
                        case 4:
                            refresh_interval = 10800000;
                            break;
                        default:
                            break;
                    }
                    stockRefreshTask.cancel();
                    stockRefreshTask = new StockRefreshTask();
                    stockRefresh.schedule(stockRefreshTask, 0, 
					  refresh_interval);
                    settings(true);
                }

            // Exit command executed
            } else if (type.equals("Exit")) {
                try {
                    destroyApp(true);
                }
                catch (MIDletStateChangeException msce) {
                    mainMenu();
                }

            // Calc command executed
            } else if (type.equals("Calc")) {
                if (origPurchPriceField.size() == 0) {
                    error("You must enter the price you originally "
			  + "purchased the stock at.", 2000);
                } else {
                    if (numSharesField.size() == 0) {
                        error("You must specify the number of shares"
			      +" to calculate with.", 2000);
                    } else {
                        calc();
                    }
                }

            // About command exectuted
            } else if (type.equals("About")) {
                about();

            // No command button was pressed but a list selection was made
            } else {
                List shown = (List) display.getCurrent();

                // if it's a menu not a list of stocks then we'll
                // use a switch to select which action to perform
                if (currentMenu.equals("Main") ||
                    currentMenu.equals("Settings") ||
                    currentMenu.equals("AlertMenu")) {
                    switch (shown.getSelectedIndex()) {
                    case 0:

                            // View Stocks
                            if (currentMenu.equals("Main")) {
                                chooseStock(true, "View", Choice.IMPLICIT,
					    true);

                            // Updates
                            } else if (currentMenu.equals("Settings")) {
                                updates();

                            // Add Alert
                            } else {
                                chooseStock(true, "AddAlert", Choice.IMPLICIT, 
					    false);
                            }
                            break;
                    case 1:

                            // What If?
                            if (currentMenu.equals("Main")) {
                                chooseStock(true, "WhatChoose", 
					    Choice.IMPLICIT, 
					    false);

                            // Add Stock
                            } else if (currentMenu.equals("Settings")) {
                                addStock();

                            // Remove Alert
                            } else {
                                viewAlerts();
                            }
                            break;
                    case 2:

                            // Alerts
                            if (currentMenu.equals("Main")) {
                                alertMenu(false);

                            // Remove Stock
                            } else if (currentMenu.equals("Settings")) {
                                chooseStock(true, "RemoveStock", 
					    Choice.MULTIPLE,
					    false);
                            }
                            break;
                    case 3:

                            // Settings
                            if (currentMenu.equals("Main")) {
                                settings(false);
                            }
                            break;

                    default:
                            break;
                    }

                /*
                 * we've now determined that it is a menu of stocks
                 * so we have to either show the stock info (from the
                 * View menu), add an alert (if Alert Choose screen is
                 * showing) or perform a What If? (if the What If? Choose
                 * screen is showing)
                 */
                } else {
                    if (currentMenu.equals("View")) {
                        displayStock(choose.getString(choose.getSelectedIndex())
                                       .substring(0, 
						  choose.getString(choose
							   .getSelectedIndex())
						  .indexOf('@')-1));
                    } else if (currentMenu.equals("WhatChoose")) {
                        if (choose.getSelectedIndex() >= 0) {
                            whatIfForm(choose.getString(choose
						    .getSelectedIndex()));
                        }
                    } else if (currentMenu.equals("AddAlert")) {
                        if (choose.getSelectedIndex() >= 0) {
                            alertForm(choose.getString(choose
						   .getSelectedIndex()));
                        }
                    }
                }
            }
            return;
        }
    }

    /**
     * <p>This is an extension of the <code>TimerTask</code> class which runs
     * when called by <code>Timer</code>.  It refreshes the stock info for
     * each stock from the quote server and checks to see if any of the alerts
     * should be fired.</p>
     *
     * @see java.util.TimerTask
     */
    private class StockRefreshTask extends TimerTask {

        /**
         * <p>Execute the Timer's Task</p>
         */
        public void run() {
            try {

                // Just return if the database is empty
                if (stocks.getNumRecords() == 0) {
		    return; 
		}
		
                // Get all the records
                RecordEnumeration re = stocks.enumerateRecords();
                while (re.hasNextElement()) {
                    String tkrSymbol = 
			Stock.getName(new String(re.nextRecord()));
                    try {
                        byte[] rec = getStockQuote(tkrSymbol).getBytes();
			
                        // Update the record and check for any alerts that
			// may need to be executed
                        stocks.update(tkrSymbol, rec);
                        checkAlerts(tkrSymbol);
                    } catch (NumberFormatException nfe) {
                        error("\"" + tkrSymbol 
			      + "\" not found on server, or invalid data "
			      + "received from server", 2000);
                    }
		}   
	    } catch (Exception e) {
		error("Update Failed\n\nStocks were not updated", 2000);
	    }
	}
    }
}