Example 7.31 ViewAccountDetailsCommand

public class ViewAccountDetailsCommand implements 
  Command {
  public ViewAccountDetailsCommand() { }

  // view account details operation
  public String execute(RequestHelper helper)
    throws javax.servlet.ServletException, 
  java.io.IOException {
    /** This will tell the user that a system error 
      * has occured and will typically not be seen. It 
      * should be stored in a resource file **/
    String systemerror = 
      "/jspdefaultprocessingerror.jsp";
        
    LogManager.logMessage(helper.getRequest(), 
      "ViewAccountDetailsCommand", 
      "Get Account Details from an adapter object");

    /** Use an adapter to retrieve data from business 
      * service, and store it in a request attribute.
      * Note: Object creation could be avoided via 
      * factory, but for example purposes object 
      * instantiation is shown **/
    AccountingAdapter adapter = new 
                           AccountingAdapter();
    adapter.setAccountInfo(helper);

    LogManager.logMessage(helper.getRequest(), 
  "ViewAccountDetailsCommand", "processing complete");

    /** Note: Object creation could be avoided via 
      * factory, but for example purposes object 
      * instantiation is shown**/
    Dispatcher dispatcher = new Dispatcher();
    dispatcher.dispatch(helper);
   
    /** This return string will not be sent in a 
      * normal execution of this scenario, because 
      * control is forwarded to another resource 
      * before reaching  this point. Some commands do 
      * return a String,  though, so the return value 
      * is included for  correctness. **/
    return systemerror;
  }
}