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The ssnField is the field that the user types his or her student ID into to signal his or her intent to log on. We need to listen for the ActionEvents that are generated when a user presses the Enter key after typing in this field. aListener = new ActionListener() { public void actionPerformed(ActionEvent e) { We ve created a private housekeeping method, clearFields, which steps through the three components on the GUI that represent student-specific information nameLabel, totalCoursesLabel, and studentCourseList clearing them of any information that is still being displayed for a previously logged on student. You ll see the code for this method, along with several other housekeeping methods, toward the end of this discussion. // First, clear the fields reflecting the // previous student's information. clearFields(); Next, we use the getText method of the ssnField to pull whatever String value the user has typed into that field. // We'll try to construct a Student based on // the ssn we read from the GUI. String id = ssnField.getText(); We attempt to instantiate a new Student object representing the real student user (an example of a boundary class, as we discussed in 11). Specifically, we utilize the static SRSDataAccess.initializeStudent method to attempt to reconstitute a Student from persistent storage based on the id that he or she has typed; if this effort fails, an InvalidStudentException is thrown.

28-SEP-1956 01-NOV-1963 28-SEP-1968 03-DEC-1969

try { theStudent = SRSDataAccessinitializeStudent(id); } catch (InvalidStudentException e2) { If the attempt to initialize the Student fails, we reset the currentUser attribute of the MainFrame class to null to signify that no user is logged on; this has the added effect of causing reference variable currentUser to drop any handle that it might still have been holding on a previously logged on Student object // Drat! The ID was invalid currentUser = null; We then display a warning message to the user, and exit from the actionPerformed method with a return statement: // Let the user know that login failed JOptionPaneshowMessageDialog(null, "Invalid student ID; please try again", "Invalid Student ID", JOptionPaneWARNING_MESSAGE); return; } On the other hand, if the Student object was successfully created, it s time to ask the user to provide a password before displaying student-proprietary information.

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We asked each developer why he decided to use Django, what other options were considered, and how the decision to use Django was ultimately made.

Confidential Created by: BOOK SQL> btitle off SQL> btitle btitle OFF and is the following 66 characters: col 20 'Confidential' tab 8 'Created by: ' SQL.USER SQL> ttitle off SQL> The output in Listing 11-30 shows the effects of the TTITLE and BTITLE commands. Note that we use two predefined variables: SQL.PNO for the page number and SQL.USER for the current username. The TTITLE and BTITLE commands have several additional features. SQL*Plus also supports the REPHEADER and REPFOOTER commands, which allow you to add headers and footers at the report level, as opposed to the page level. See SQL*Plus User s Guide and Reference for more information about these commands.

// If we've made it to this point in our code, // we found a valid student We now need // to request and validate the password PasswordPopup pp = new PasswordPopup( MainFramethis); The preceding line of code is responsible for instantiating and displaying a PasswordPopup dialog box, which is a special class that we ve defined as a subclass of JDialog We ll review the code for PasswordPopup in its entirety after we finish stepping through the MainFrame class The PasswordPopup dialog box happens to be a modal dialog box, which means that as long as the PasswordPopup dialog box is displayed on the screen, the user will be unable to interact with the rest of the SRS GUI.

More importantly, though, as long as the dialog box is displayed on the screen, the JVM will be awaiting events from that dialog box, and the code for the MainFrame method that we re in the middle of executing namely, the actionPerformed method of the ssnField s anonymous inner ActionListener class is suspended By the time we reach the next line of code, we know that the password dialog box has been dismissed by the user (it was modal, after all), so we can use a method that we ve written for the PasswordPopup class called getPassword that allows us to fetch whatever the user has typed into the dialog box; we ll see the code for that method when we study PasswordPopup a bit later in the chapter String pw = ppgetPassword();.

Before I joined Tabblo, Antonio Rodriguez (Tabblo s founder/CTO) did an evaluation of Rails and Django, and found that both provided a great quick-out-of-the-blocks rapid development environment. In comparing the two, he found that Django had a greater technical depth that would make it easier to build a robust, scalable site. Also, Django s Python foundation meant that we d have all the richness of the Python ecosystem to support our work. This has definitely been proven out as we ve built Tabblo.

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