trademanagementhelper.java

Oracle的J2EE Sample

      aInfo = umh.getAccountInfo(accountNo);
    } catch(Exception ex) {
      throw new TradeManagementEventException(
        "Exception while getting Account information: " + ex.toString());
    }

    return aInfo;
  }

  /**
   * This method is registered in control.xml and will be called in the
   * controller servlet using Reflection to get the values required to be
   * displayed in the JSP invoked by the client. This method calls the
   * methods in the same class to get the Trade Details and Account Information.
   * This then creates a Hashmap of the retrieved values and returns it to the
   * calling JSP where it is displayed.
   *
   * @param req HttpServletRequest
   * @return The Hashmap containing the Portfolio Information,
   *         Portfolio Valuation Information and User Account Information
   * @exception TradeManagementEventException
   * @since 1.0
   */
  public HashMap populateTradeDetails(HttpServletRequest req)
      throws TradeManagementEventException {

    HashMap hm = new HashMap();

    // The User Account Number is retrieved from the session attribute
    Integer acctNo = (Integer)req.getSession().getAttribute("LOGIN.RESPONSE");

    // Access the method of the Session Bean and set the values in the Hashmap
    AccountInfo acInfo = (AccountInfo)getAccountInfo(acctNo);

    String recordNum = req.getParameter("RECORDNUM");

    if (recordNum == null) recordNum = "1";

    hm.put("ACCOUNTINFO",      acInfo);

    hm.put("TRADEDETAILSINFO",
           getTradeDetailsInfo(acctNo, recordNum,
                               acInfo.getLinesPerPage().intValue()));

    return hm;
  }

  /**
   * This method is called when the user buys stock using the application.
   * The User Account Number is obtained from the session of the user's request.
   * The Symbol and Quantity traded are obtained from the request parameters.
   * StockSymbolHelper is used to check if the symbol is traded here.
   * UserManagementHelper is used to get the Contact Information of the
   * logged in user. This method calls the method in
   * TradeManagementSessionFacadeBean to carry out the buy transaction.
   *
   * @param req HttpServletRequest
   * @exception ApplicationError  When an application specific error
   *                              message needs to be thrown and handled
   * @exception TradeManagementEventException
   * @since 1.0
   */
  public void buyStock(HttpServletRequest req)
      throws ApplicationError, TradeManagementEventException {

    String retMessage = "FAILURE";

    // Get user account number from the session of user's request
    Integer accountNo = (Integer)req.getSession().getAttribute("LOGIN.RESPONSE");

    // Get the quantity from the request parameters
    String qty = req.getParameter("QUANTITY").trim();

    if ((qty == null) || (qty == "")) {
      throw new ApplicationError("Quantity should be entered");
    }

    Integer quantity = null;

    try {

      quantity = new Integer(qty.trim());

    } catch (NumberFormatException nfe) {
      throw new ApplicationError("Quantity should be a number");
    }

    if (quantity.intValue() <= 0) {
      throw new ApplicationError("Quantity should be greater than zero");
    }

    // Get the symbol from the request parameters
    String  symbol   = req.getParameter("SYMBOL").trim().toUpperCase();

    if ((symbol == null) || (symbol == "")) {
      throw new ApplicationError("Symbol should be entered");
    }

    boolean isTraded = false;

    try {

      // Get the isTraded flag from the StockSymbolHelper
      isTraded = ssh.isTradedHere(symbol);

    } catch(AdminHelperException ex) {
      throw new TradeManagementEventException(
        "Exception while getting isTraded flag: " + ex.toString());
    }

    ContactInfo cInfo = null;

    try {

      // Get the Contact Information of the User, email id is required!
      cInfo = umh.getContactInfo(accountNo);

    } catch(Exception ex) {
      throw new TradeManagementEventException(
        "Exception while getting User's Contact Info : " + ex.toString());
    }

    Date sysDate = new Date(); // Current Date

    try {

      // Call the method in TradeManagementSessionFacadeBean
      // to carry out the buy transaction
      retMessage = rmr.buyStock(accountNo, quantity, symbol,
                                isTraded, cInfo.getEmail(), connHash,
                                DateFormatter.getStringFromDate(sysDate,
                                          "yyyy.MM.dd hh:mm:ss a zzz"));
    } catch(SQLException re) {
      throw new TradeManagementEventException(
        "SQL Exception while calling buy stock : " + re.toString());
    } catch(RemoteException re) {
      throw new TradeManagementEventException(
        "Remote Exception while calling buy stock : " + re.toString());
    }

    if (retMessage.equals("SUCCESS")) {

      StringBuffer sb = new StringBuffer();
      sb.append("Transaction completed. ");
      sb.append(quantity);
      sb.append(" stocks of '");
      sb.append(symbol);
      sb.append("' added to your Portfolio ");

      req.setAttribute("InfoMessage", sb.toString());

    } else {
      throw new ApplicationError(retMessage);
    }
  }

  /**
   * This method is used by the AdminHelper to transfer stocks from a corporate
   * to an individual. StockSymbolHelper is used to check if the symbol is
   * traded here. UserManagementHelper is used to get the Contact Information
   * of the logged in user. This method calls the method in
   * TradeManagementSessionFacadeBean to carry out the transfer of stocks to
   * the input Account Number.
   *
   * @param toAccountNumber Account Number to which Stocks are transfered
   * @param symbol          Stock Symbol
   * @param qty             Quantity
   * @param price           Price
   * @return An integer indicating success or failure,
   *         0 indicates success and -1 indicates failure
   * @exception TradeManagementEventException
   * @since 1.0
   */
  public Integer corporateTransfer(Integer toAccountNumber, String symbol,
                                   Integer qty, Float price)
      throws ApplicationError, TradeManagementEventException {

    Integer nextTradeId = new Integer("0");
    boolean isTraded = false;

    try {

      // Get the isTraded flag from the StockSymbolHelper
      isTraded = ssh.isTradedHere(symbol);

    } catch(AdminHelperException ex) {
      throw new TradeManagementEventException(
        "Exception while getting isTraded flag: " + ex.toString());
    }

    ContactInfo cInfo = null;

    try {

      // Get the Contact Information of the User, email id is required!
      cInfo = umh.getContactInfo(toAccountNumber);

    } catch(Exception ex) {
      throw new TradeManagementEventException(
        "Exception while getting User's Contact Info : " + ex.toString());
    }

    Date sysDate = new Date(); // Current Date

    try {

      // Call the method in TradeManagementSessionFacadeBean
      // to carry out the corporate transfer
      nextTradeId = rmr.corporateTransfer(toAccountNumber, symbol, qty, price,
                                          isTraded, cInfo.getEmail(), connHash,
                                          DateFormatter.getStringFromDate(
                                          sysDate, "yyyy.MM.dd hh:mm:ss a zzz"));

    } catch(RemoteException re) {
      throw new TradeManagementEventException(
        "Remote Exception while calling corporate transfer : " + re.toString());
    }

    return nextTradeId;
  }

  /**
   * This method is used when the user sells stock using the application.
   * The User Account Number is obtained from the session of the user's request.
   * The Sell Quantity, Line Numbers, Symbols, Trade Id are obtained from the
   * request parameters. StockSymbolHelper is used to check if the symbol is
   * traded here. UserManagementHelper is used to get the Contact Information
   * of the logged in user. This method calls the method in
   * TradeManagementSessionFacadeBean to carry out the sell transaction of stocks.
   *
   * @param req HttpServletRequest
   * @return The return message is a string which contains details
   *         about the failure or success of the sell transactions.
   * @exception TradeManagementEventException
   * @since 1.0
   */
  public String sellStock(HttpServletRequest req)
      throws ApplicationError, TradeManagementEventException {

    Integer  accountNo  = (Integer)req.getSession().getAttribute("LOGIN.RESPONSE");
    String[] qtyValues  = req.getParameterValues("SELLQTY");
    String[] lineNos    = req.getParameterValues("LINENO");
    String[] symbols    = req.getParameterValues("SYMBOL");
    String[] tradeId    = req.getParameterValues("TRADEID");

    Date   sysDate        = new Date();
    String retMessage     = "FAILURE";
    String isTradedFlag[] = new String[lineNos.length];

    try {

      for(int i = 0;i < lineNos.length;i++) {

        // Get the isTraded flag for the symbol from StockSymbolHelper
        boolean isTraded = ssh.isTradedHere(symbols[i]);

        // Set the isTradedFlag array to 'Y' or 'N'
        // depending on whether isTraded is 'true' or 'false'
        if (isTraded) {
          isTradedFlag[i] = new String("Y");
        } else {
          isTradedFlag[i] = new String("N");
        }
      }

    } catch(AdminHelperException ex) {
      throw new TradeManagementEventException(
        "Exception while getting isTraded flag: " + ex.toString());
    }

    ContactInfo cInfo = null;

    try {

      // Get the Contact Information of the User, email id is required!
      cInfo = umh.getContactInfo(accountNo);

    } catch(Exception ex) {
      throw new TradeManagementEventException(
        "Exception while getting User's Contact Info : " + ex.toString());
    }

    try {

      // Call the method in TradeManagementSessionFacadeBean
      // to carry out the sell transactions
      retMessage =
        rmr.sellStock(accountNo, qtyValues, lineNos, symbols,
                      tradeId, isTradedFlag, cInfo.getEmail(), connHash,
                      DateFormatter.getStringFromDate(sysDate,
                                            "yyyy.MM.dd hh:mm:ss a zzz"));
    } catch(SQLException re) {
      throw new TradeManagementEventException(
        "SQL Exception while calling sell stock : " + re.toString());
    } catch(RemoteException re) {
      throw new TradeManagementEventException(
        "Remote Exception while calling sell stock : " + re.toString());
    }

    return retMessage;
  }

}