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Class distans.CreateCourseApplet

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.Container
                   |
                   +----java.awt.Panel
                           |
                           +----java.applet.Applet
                                   |
                                   +----distans.CreateCourseApplet

public class CreateCourseApplet

extends Applet

actualCourse

A string with the name of the most recent course chosen, which is used for user information.

addNewUserButton

CCD

A dialog object used for prompting to the user that is created on startup and then used for all the dialogs which uses pop-up windows.

CCDL

The CreateCourseDataLoader object is responsible for communication with the server as well as having references to the data stuctures and the reponsability to perform some calculations, such as sorting vectors.

CH

The object that holds the courses related to the teacher and the students registered to the courses in a double nested hashtable.

chooseCourseCreateButton

chooseCourseDeleteButton

chooseCourseLabel

chooseCourseList

chooseCourseOKButton

chooseCoursePanel

chooseCourseTextArea

courseChosenDefaultInfo

The courseChosenDefaultInfo is shown in the text are in Choose Course panel on viewing the panel.

currentTab

Used by the Info panel.

EditCourseTextArea

editStudentsCancelButton

editStudentsCommitButton

editStudentsDeleteButton

editStudentsEditStudentsButton

editStudentsLabel

editStudentsList

editStudentsNewDataTextField

editStudentsOldDataLabel

editStudentsPanel

editStudentsTextField

extraPanel

infoList

infoOfCourseButton

infoPanel

infoShowButton

infoTextArea

local

If this is true the Applet will search information on the local harddisk.

newDataLabel

oldDataLabel

reagisterStudentsTextField

registerStudentsClearButton

registerStudentsLabel

registerStudentsList

registerStudentsPanel

registerStudentsRegisterButton

registerStudentsTextArea

removeYourAccessButton

thePanel

user

The username of the user, set on initialization.

CreateCourseApplet()

addNewUserButton_ActionPerformed(ActionEvent)

Prompts the user with a dialog window to get the username to which access to the actual course should be added.

chooseCourseCreateButton_Clicked(ActionEvent)

1.

chooseCourseDeleteButton_Clicked(ActionEvent)

1.

chooseCourseList_DblClicked(ActionEvent)

Does the same as chooseCourseOKButton_Clicked

chooseCourseList_ItemStateChanged(ItemEvent)

Enables the chooseCourseOKButton if there are a course marked in the chooseCourseList.

chooseCourseOKButton_Clicked(ActionEvent)

1.

chooseCoursePanel_GotFocus(FocusEvent)

Shows information to the user.

clearEditStudData()

Clears the label and the textField.

editStudentsCancelButton_Clicked(ActionEvent)

Cancel the editing of the marked student.

editStudentsCommitButton_Clicked(ActionEvent)

Checks the new information given about an edited student to see that the syntax is correct.
Checks to see if the cedula of the edited student is the same as before the editing and if so just writes over the old information of the student and if not removes the old student data and register the new student data.
Updates the new information given about the edited student in the CoursesHashtable and the applets student lists.

editStudentsDeleteButton_ActionPerformed(ActionEvent)

Removes the marked student from the course by calling the server.

editStudentsEditStudentsButton_Clicked(ActionEvent)

Puts the student marked in the editStuentsList into editable mode.

editStudentsList_DblClicked(ActionEvent)

Does the same as the editStudentsEditStudentsButton_Clicked

editStudentsList_ItemStateChanged(ItemEvent)

If a student is marked in the editStudentsList then the edit and delete buttons are enabled, if not they are disabled.

editStudentsPanel_GotFocus(FocusEvent)

Shows information to the user.

enableEditStudent(boolean)

Sets the enable students mode to either true or false, depending on cond.

extraPanel_FocusLost(FocusEvent)

If the user has removed its access to the actual course, then the Edit Course panel is set to disabled on user leaving.

getUserName()

Returns the username of the user.

infoList_DblClicked(ActionEvent)

Set the information in the infoTextArea for the panel selected in the infoList.

infoOfCourseButton_ActionPerformed(ActionEvent)

Calls the server for information about the actual course and displays the answer to the user.

infoPanel_GotFocus(FocusEvent)

Sets the information in the infoTextArea for the panel most recent visited.

infoShowButton_Clicked(ActionEvent)

Does the same as infoList_DblClicked.

init()

This method is called by the browser when the applet starts.

myInit()

Inits the non-graphical parameters/methods and launches the password dialog.

registerStudentsClearButton_Clicked(ActionEvent)

Clears the registerStudentsTextArea.

registerStudentsList_DblClicked(ActionEvent)

Shows the Edit Student panel with the student that was double clicked in the registerStudentsList put into the editStudent mode.

registerStudentsPanel_GotFocus(FocusEvent)

Shows information to the user.

registerStudentsRegisterButton_Clicked(ActionEvent)

Register the students typed into the registerStudentsTextArea on server to the actual course.

registerStudentsTextArea_TextValueChanged(TextEvent)

Enables/disables the registerStudentsClear/Register buttons depending on if the registerStudentsTextArea is emppty or not.

removeYourAccessButton_ActionPerformed(ActionEvent)

1.

updateCourseList()

Calls CoursesHashtable to get the courses and puts these courses into the chooseCourseList.

updateStudentsLists()

Calls CoursesHashtable to get the students registered for the actual course.

 private static String user

The username of the user, set on initialization.

 protected boolean local

If this is true the Applet will search information on the local harddisk. This is used for debuging.

 private CreateCourseDataLoader CCDL

The CreateCourseDataLoader object is responsible for communication with the server as well as having references to the data stuctures and the reponsability to perform some calculations, such as sorting vectors.

 private CoursesHashtable CH

The object that holds the courses related to the teacher and the students registered to the courses in a double nested hashtable.
On startup the courses are put into the CoursesHashtable and then when a course is chosen, the students for that course are fetched from the server and put into the hashtable too, thus the next time the students of the course are to be called, no new fetching from the server is needed.

 private CCDBean CCD

A dialog object used for prompting to the user that is created on startup and then used for all the dialogs which uses pop-up windows.

 private String actualCourse

A string with the name of the most recent course chosen, which is used for user information.

 private String currentTab

Used by the Info panel. The most recent panel is saved into the currentTab string, so that the Info panel when viewed show information about the most recent panel viewed.

 private static final String courseChosenDefaultInfo

The courseChosenDefaultInfo is shown in the text are in Choose Course panel on viewing the panel.

 TabPanel thePanel

 Panel chooseCoursePanel

 List chooseCourseList

 Label chooseCourseLabel

 Button chooseCourseDeleteButton

 Button chooseCourseCreateButton

 TextArea chooseCourseTextArea

 Button chooseCourseOKButton

 Panel registerStudentsPanel

 List registerStudentsList

 Label registerStudentsLabel

 Button registerStudentsRegisterButton

 TextArea registerStudentsTextArea

 Button registerStudentsClearButton

 TextField reagisterStudentsTextField

 Panel editStudentsPanel

 List editStudentsList

 Button editStudentsEditStudentsButton

 Label editStudentsLabel

 Button editStudentsCommitButton

 Button editStudentsCancelButton

 Label oldDataLabel

 Label newDataLabel

 Label editStudentsOldDataLabel

 TextField editStudentsTextField

 Button editStudentsDeleteButton

 TextField editStudentsNewDataTextField

 Panel infoPanel

 TextArea infoTextArea

 List infoList

 Button infoShowButton

 Panel extraPanel

 TextArea EditCourseTextArea

 Button infoOfCourseButton

 Button addNewUserButton

 Button removeYourAccessButton

 public CreateCourseApplet()

 public void init()

This method is called by the browser when the applet starts. Initialize all graphical components.

Overrides:

init in class Applet

 private void myInit()

Inits the non-graphical parameters/methods and launches the password dialog.
Loads the subjects taken from the password dialog into the chooseCourseList.
Loads the names of the panels into the InfoList from the Class Info. Sets the default viewed panel (Choose Course) and disables the Register Students, Edit Students and Edit Course panels.

 void extraPanel_FocusLost(FocusEvent event)

If the user has removed its access to the actual course, then the Edit Course panel is set to disabled on user leaving.

 void infoOfCourseButton_ActionPerformed(ActionEvent event)

Calls the server for information about the actual course and displays the answer to the user.

 void addNewUserButton_ActionPerformed(ActionEvent event)

Prompts the user with a dialog window to get the username to which access to the actual course should be added. Then calls the server to perform the add access procedures.

 void removeYourAccessButton_ActionPerformed(ActionEvent event)

1. Prompts the user with a dialog window to make sure the user wants to remove its access from the actual course. 2. Calls the server to perform the procedures of removing access from the user. 3. Removes the actual course from the chooseCourseList.

 void infoShowButton_Clicked(ActionEvent event)

Does the same as infoList_DblClicked.

 void infoList_DblClicked(ActionEvent event)

Set the information in the infoTextArea for the panel selected in the infoList.

 void infoPanel_GotFocus(FocusEvent event)

Sets the information in the infoTextArea for the panel most recent visited.

 void editStudentsPanel_GotFocus(FocusEvent event)

Shows information to the user.

 void editStudentsList_ItemStateChanged(ItemEvent event)

If a student is marked in the editStudentsList then the edit and delete buttons are enabled, if not they are disabled.

 void editStudentsDeleteButton_ActionPerformed(ActionEvent event)

Removes the marked student from the course by calling the server.

 void editStudentsCancelButton_Clicked(ActionEvent event)

Cancel the editing of the marked student.

 void editStudentsList_DblClicked(ActionEvent event)

Does the same as the editStudentsEditStudentsButton_Clicked

 void editStudentsEditStudentsButton_Clicked(ActionEvent event)

Puts the student marked in the editStuentsList into editable mode.

 void editStudentsCommitButton_Clicked(ActionEvent event)

Checks the new information given about an edited student to see that the syntax is correct.
Checks to see if the cedula of the edited student is the same as before the editing and if so just writes over the old information of the student and if not removes the old student data and register the new student data.
Updates the new information given about the edited student in the CoursesHashtable and the applets student lists.

 private void clearEditStudData()

Clears the label and the textField.

 private void enableEditStudent(boolean cond)

Sets the enable students mode to either true or false, depending on cond.

 void registerStudentsPanel_GotFocus(FocusEvent event)

Shows information to the user.

 void registerStudentsClearButton_Clicked(ActionEvent event)

Clears the registerStudentsTextArea.

 void registerStudentsRegisterButton_Clicked(ActionEvent event)

Register the students typed into the registerStudentsTextArea on server to the actual course.
Update the CoursesHashtable and the students list for the course with the new students.

 void registerStudentsTextArea_TextValueChanged(TextEvent event)

Enables/disables the registerStudentsClear/Register buttons depending on if the registerStudentsTextArea is emppty or not.

 void registerStudentsList_DblClicked(ActionEvent event)

Shows the Edit Student panel with the student that was double clicked in the registerStudentsList put into the editStudent mode.

 void chooseCoursePanel_GotFocus(FocusEvent event)

Shows information to the user.

 void chooseCourseCreateButton_Clicked(ActionEvent event)

1. Prompts the user with a dialog window for the user to type the name of the new course he/she would like.
2. Checks that there is not a course with the same name already existing (for the moment just the courses that the user has access to).
3. Creates the course on server.
4. Sets the actual course to be the created one.
5. Updates the coursesHashtable and the chooseCourseList with the new course.

 void chooseCourseDeleteButton_Clicked(ActionEvent event)

1. Prompts the user with a dialog window for the user to accept/cancel the deletion of the course marked in the chooseCourseList.
2. Deletes the course from server.
3. Sets the actual course to be the last choosen one.
4. Updates the coursesHashtable and the chooseCourseList with the deleted course removed.

 void chooseCourseList_ItemStateChanged(ItemEvent event)

Enables the chooseCourseOKButton if there are a course marked in the chooseCourseList.

 void chooseCourseOKButton_Clicked(ActionEvent event)

1. Fill up the coursesHashtable with the students for the course if not already done. 2. Enable the Register Students, Edit Students and the Edit Course panels. 3. Update the student lists in the Register Students and Edit Students panels.

 void chooseCourseList_DblClicked(ActionEvent event)

Does the same as chooseCourseOKButton_Clicked

 private void updateCourseList()

Calls CoursesHashtable to get the courses and puts these courses into the chooseCourseList.

 void updateStudentsLists()

Calls CoursesHashtable to get the students registered for the actual course. Puts the students into the reigsterStudentsList and the editStudentsList.

 public static String getUserName()

Returns the username of the user.

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