Event Handling - New Approach

Hi,
I have developed a BSP and implemented the way Brian described in the Apprach 3 of the weblog mentioned below. In the method of new class that handles the server event(method name is same as server event), How do I access the model instance that I used in my BSP?
BSP Programming: Handling HTMLB Events
/people/brian.mckellar/blog/2004/07/28/bsp-programming-handling-htmlb-events
Thanks,
Suresh

Brian it's Good Idea to create in Controller Class or creating event handling methods within the model class. But I would like to create s separate class just for Even handling alone, so that I can use wherever I want(in different BSP Applications).
1.I have created ZCL_EVENT_HANDLER_FORME.
2.Created Method HANDLE_MYBUTTONCLICK and passed
event_object as a parameter.
3. I have ZCL_MY_CONTROLLER and ZCL_MODEL for BSP.
4. Created instance of ZCL_MODEL and assigned it to the Controller Attribute.
5. Successfully dispatced the event from DO_HANDLE_EVENT to HANDLE_MYBUTTONCLICK method of CL_EVENT_HANDLER_FORME.
6. I don't know how to get the reference to the model in
HANDLE_MYBUTTONCLICK method of CL_EVENT_HANDLER_FORME.
Am I missing some thing....
-Suresh

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Hi,
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We should write a post process event handler that updates the manager field. So, I used the following code to update the manager field when a user gets created:
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Test for Event Handler
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oracle.iam.identity.usermgmt.vo.UserManagerResult@14da2ada
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Exception4
Thanks
Krish

i hope wrong coding.
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How to update 1 Event Handler from different SAP systems?

Hi experts.
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Hello Berthold, Steffen,
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Event Handling Techniques

Hi All,
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This is a basic example of the principles:
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Is this necessarily a better approach than having a dedicated EventListener for each separate component.
I always thought that the idea was to minimise the amount of processing for any event so that the UI was very reactive to user input (by having dedicated EventListeners). I can see that this approach could suffer
in a situation with the EventHandler being responsible for many components i.e. Having to evaluate a big list of expressions because of the number of delegated commands.
I would very much like to know if anyone has any strong views on this or if anyone knows the Sun guidance on this matter.
Thanks for any replies,
Jonathan.

I would recommend creating a single listener and add it to every label added to the graph. If you're interested in events that occur outside of the labels (in the background), add a listener to the container of the labels as well.
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The reflection answer to event handling?

I have been playing with reflection answers to the question of how to handle ActionEvent events in Swing... like using a single instance of one member class as a reflection switch:
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}No more hideous if/then structures and only one inner class. Just match the method names to the action commands and the two line switch handles everything. Much cleaner code and directories.
I wrote a small example program that you can get the source for here:
http://www.immortalcoil.org/drake/SmartFrameExample.java
I can think of only two reasons not to do this right now:
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2) Inability to look yourself in the mirror or partake of Jesus's love.
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Thoughts?

For simple GUIs with very few actions, your approach is obviously overkill. You want to preserve simplicity whenever possible without affecting performance.
For mildly complex GUIs, I think your approach is good, but still doesn't solve the bigger problem of managing multiple components that use the same action. If you've got so many actions that you need reflection to reduce code, you probably have a GUI with menubars, toolbars, popup menus, and buttons that all perform the same set of actions. Now you have to register an ActionListener with each component, not to mention disabling an action, which involves finding every menu item and button corresponding to this action and disabling/enabling it. I realize this is a different problem than you were trying to solve, but it's worth considering.
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3) a static Icon for the icon
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UIX choice component event handling

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public static EventResult fminstEventHandler(BajaContext context,Page page,PageEvent event) throws Throwable
result = new EventResult();
fmInst = event.getParameter("FmName");
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deptView.setWhereClause("where inst ='" + fmInstNum +"' and dept != '*****' and guide_yr ='"+guideyr +"' union select 'ALL', '0' from dual");
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Thanks for your help.
McKell

Sure. Thanks for responding to my question. Below is the UIX file:
<?xml version = '1.0' encoding = 'windows-1252'?>
<page xmlns="http://xmlns.oracle.com/uix/controller"
xmlns:ui="http://xmlns.oracle.com/uix/ui"
xmlns:data="http://xmlns.oracle.com/uix/ui"
xmlns:ctrl="http://xmlns.oracle.com/uix/controller"
xmlns:html="http://www.w3.org/TR/REC-html40" expressionLanguage="el"
xmlns:myTemplate="CourseTransferTemplate">
<templates xmlns="http://xmlns.oracle.com/uix/ui">
<templateImport source="CrsTranTemplate.uit"/>
</templates>
<content>
<dataScope xmlns="http://xmlns.oracle.com/uix/ui">
<provider>

</provider>
<contents>
<document xlmns="http://xmlns.oracle.com/uix/ui">
<metaContainer>

<head title="Course Transfer Search"/>
</metaContainer>
<contents>
<body>
<contents>
<form name="form0">
<contents>

<myTemplate:CourseTransferTemplate selectedTab="0"
title="Course Transfer Search"
xmlns:myTemplate="CourseTransferTemplate">
<contents>
<rawText
text="<p>Welcome to the Utah System of Higher Education (USHE) Course Transfer Guide on the Web!
<p>The USHE Course Transfer Guide provides course-by-course articulation and transfer information. It shows how a course at the institution you are transferring from (the 'from' school) articulates with a course at the institution to which you plan to transfer (the 'to' school). The USHE Course Transfer Guide has been developed by the Utah Transfer Articulation Committee and the ">
<contents>
<link text="Utah System of Higher Education"
destination="http://www.utahsbr.edu"/>
<rawText text="(USHE). It is updated every year by participating institutions and a new guide is published in the fall.<p>"/>
</contents>
</rawText>

<rawText text="Guide Year ">
<contents>
<choice model="${data.TransferGuideUIModel.GuideYr2}" name="GuideYr2" prompt="GuideYr2" >
<primaryClientAction>
<firePartialAction event="guideyrEvent"
formSubmitted="true"
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</primaryClientAction>
<contents childData="${data.TransferGuideUIModel.GuideYr2.displayData}">
<option model="${uix.current}" text="${uix.current.prompt}"
value="${uix.current.prompt}" />
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</choice>
</contents>
</rawText>

<rawText text="From Institution ">
<contents>
<choice model="${data.TransferGuideUIModel.Name}"
name="FmName" prompt="FmName">
<primaryClientAction>
<firePartialAction event="FmInstEvent"
formSubmitted="true"
targets="Department"/>
</primaryClientAction>
<contents
childData="${data.TransferGuideUIModel.Name.displayData}">
<option model="${uix.current}"
text="${uix.current.prompt}"
value="${uix.current.prompt}"/>
</contents>
</choice>
</contents>
</rawText>

<rawText text="From Department ">
<contents>
<choice model="${data.TransferGuideUIModel.Dept}" name="Dept" prompt="Dept">
<primaryClientAction>
<firePartialAction event="DepartmentEvent"
formSubmitted="true"
targets="Course"/>
</primaryClientAction>
<contents childData="${data.TransferGuideUIModel.Dept.displayData}">
<option model="${uix.current}"/>
</contents>
</choice>
</contents>
</rawText>

<rawText text="From Course ">
<contents>
<choice id="Course" name="Crs" nodeID="Course">
<primaryClientAction>
<firePartialAction event="CourseEvent"
formSubmitted="true"
/>
</primaryClientAction>
</choice>
</contents>
</rawText>

<rawText text="To Institution ">
<contents>
<choice model="${data.TransferGuideUIModel.Name}"
name="ToName" prompt="ToName">
<primaryClientAction>
<firePartialAction event="ToInstEvent"
formSubmitted="true"
/>
</primaryClientAction>
<contents
childData="${data.TransferGuideUIModel.Name.displayData}">
<option model="${uix.current}"
text="${uix.current.prompt}"
value="${uix.current.prompt}"/>
</contents>
</choice>
</contents>
</rawText>
<button text="Find Articulations"/>
<rawText text="<p>Choose the academic year you want to search for articulations. Then choose the institution you are transferring from. After you make your selection, a list of departments will be created for you to choose from. Once you choose your department, a list of courses will be created for you to refine your selection. You will then choose which institution you would like to transfer to (you may choose all institutions) and click on 'find articulations'. "/>
</contents>
<tabs/>
<pageButtons/>
<globalButtons/>
<pageHeader/>
<start/>
<end/>
<about/>
<copyright/>
<privacy/>
<corporateBranding/>
<productBranding/>
</myTemplate:CourseTransferTemplate>
</contents>
</form>
</contents>
</body>
</contents>
</document>
</contents>
</dataScope>
</content>
<handlers>

<event name="*" source="FmName">
<method class="mypackage1.EventHandlers" method="fminstEventHandler"/>
</event>
<event name="*" source="Department">
<method class="mypackage1.EventHandlers" method="deptEventHandler"/>
</event>
<event name="*" source="GuideYr2">
<method class="mypackage1.EventHandlers" method="guideyrEventHandler"/>
</event>
<event name="*" source="Course">
<method class="mypackage1.EventHandlers" method="courseEventHandler"/>
</event>
<event name="*" source="ToName">
<method class="mypackage1.EventHandlers" method="toinstEventHandler"/>
</event>
</handlers>
</page>
HERE IS THE EVENT HANDLER:
public static EventResult fminstEventHandler(BajaContext context,Page page,PageEvent event) throws Throwable
try
con = new DBConnection();
catch (SQLException e)
System.out.println(e);
fmInst = event.getParameter("FmName");
ResultSet rset = con.query(namesql); //Here con connects to my database and preforms a query.
while(rset.next())
fmInstNum = rset.getString(1);
System.out.println(fmInstNum);
//DeptAppModule and DeptView are an Application Module and View Object I created from the JDeveloper wizards
DeptAppModuleImpl dam = new DeptAppModuleImpl();
ViewObject DeptView = dam.getDeptView1();
DeptView.setWhereClause("where inst ='" + fmInstNum +"' and dept != '*****' and guide_yr ='"+guideyr +"' union select 'ALL', '0' from dual");
DeptView.executeQuery();
//This is where I don't know how to return the result from the query back to the uix choice component named "Dept"
return new EventResult(page);
Thanks you so much for your assistance. I might be approaching this completely wrong. I am new to JDeveloper and the UIX framework. Thank you again.
McKell

How can I execute an external program from within a button's event handler?

I am using Tomcat ApacheTomcat 6.0.16 with Netbeans 6.1 (with the latest JDK/J2EE)
I need to execute external programs from an event handler for a button on a JSF page (the program is compiled, and extremely fast compared both to plain java and especially stored procedures written in SQL).
I tried what I'd do in a standalone program (as shown in the appended code), but it didn't work. Instead I received text saying the program couldn't be found. This error message comes even if I try the Windows command "dir". I thought with 'dir' I'd at least get the contents of the current working directory. :-(
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So, then, how can I do this?
Thanks
Ted
NB: The programs that I need to run do NOT take input from the user. Rather, my code in the web application processes user selections from selection controls, and a couple field controls, sanitizes the inoputs and places clean, safe data in a MySQL database, and then the external program I need to run gets safe data from the database, does some heavy duty number crunching, and puts the output data into the database. They are well insulated from mischeif.
NB: In the following array_function_test.pl was placed in the same folder as the web application's jsp pages, (and I'd tried WEB-INF - with the same result), and I DID see the file in the application's war file.
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            byte b[] = new byte[1000];
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        } catch (java.io.IOException ex) {
            getSelectionsDisplayTextArea().setText(getSelectionsDisplayTextArea().getText() + "\n\n" + ex.getMessage());
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Hi Fonsi!
One way to execute an external program is to use the System Exec.vi. You find it in the functions pallet under Communication.
/Thomas

Copying text to the clipboard in AVDocDidOpen event handler causes Acrobat 9 to crash

I'm trying to copy the filename of a document to the clipboard in a plugin with my AVDocDidOpen event handler. It works for the first file opened; however when a second file is opened, Acrobat crashes. The description in the application event log is: "Faulting application acrobat.exe, version 9.1.0.163, faulting module gdi32.dll, version 5.1.2600.5698, fault address 0x000074cc."
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Is there an SDK function that I should be using instead of WIN32's SetClipboardData()? Alternately, are there other SDK functions that I need to call be before or after I call SetClipboardData()
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Leonard,
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            ASfree(pURL);    // Do this before we allocate a Windows handle just in case Windows messes with this pointer
            pURL = NULL;
            HGLOBAL hText = GlobalAlloc(GMEM_MOVEABLE, 1000);
            if (hText)    {
                try
                    // Skip path info and go right to filename
                    char *pText = (char *)GlobalLock(hText);
                    char *pWork = strrchr(myURL,'/');
                    if (pWork)    {
                        strcpy(pText, pWork+1);
                    } else {
                        strcpy(pText, myURL);
                    char *pEnd = pText + strlen(pText);    // Get null terminator address
                    // Replace "%20" in filename with " "
                    pWork = strstr(pText, "%20");
                    while (pWork)    {
                        *pWork = ' ';
                        memmove(pWork+1, pWork+3, (pEnd - (pWork+2)));
                        pWork = strstr(pText, "%20");
                    // Append a new file extension
                    pWork = strstr(pText, ".pdf");
                    *pWork = 0;    // truncate the string before ".pdf"
                    strcat(pWork,".Connectors.pdf");
                    GlobalUnlock(hText);     // Must do this BEFORE SetClipboardData()
                    // Write it to the clipboard
                    OpenClipboard(NULL);
                    EmptyClipboard();
                    SetClipboardData(CF_TEXT, hText);     // Here's the culprit
                    CloseClipboard();
                    GlobalFree(hText);
                } catch (char * str) {
                    AVAlertNote(str);
        if (pURL)
            ASfree(pURL);

Swing: when trying to get the values from a JTable inside an event handler

Hi,
I am trying to write a graphical interface to compute the Gauss Elimination procedure for solving linear systems. The class for computing the output of a linear system already works fine on console mode, but I am fighting a little bit to make it work with Swing.
I put two buttons (plus labels) and a JTextField . The buttons have the following role:
One of them gets the value from the JTextField and it will be used to the system dimension. The other should compute the solution. I also added a JTable so that the user can type the values in the screen.
So whenever the user hits the button Dimensiona the program should retrieve the values from the table cells and pass them to a 2D Array. However, the program throws a NullPointerException when I try to
do it. I have put the code for copying this Matrix inside a method and I call it from the inner class event handler.
I would thank you very much for the help.
Daniel V. Gomes
here goes the code:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import AdvanceMath.*;
public class MathF2 extends JFrame {
private JTextField ArrayOfFields[];
private JTextField DimOfSis;
private JButton Calcular;
private JButton Ativar;
private JLabel label1;
private JLabel label2;
private Container container;
private int value;
private JTable DataTable;
private double[][] A;
private double[] B;
private boolean dimensionado = false;
private boolean podecalc = false;
public MathF2 (){
super("Math Calcs");
Container container = getContentPane();
container.setLayout( new FlowLayout(FlowLayout.CENTER) );
Calcular = new JButton("Resolver");
Calcular.setEnabled(false);
Ativar = new JButton("Dimensionar");
label1 = new JLabel("Clique no bot�o para resolver o sistema.");
label2 = new JLabel("Qual a ordem do sistema?");
DimOfSis = new JTextField(4);
DimOfSis.setText("0");
JTable DataTable = new JTable(10,10);
container.add(label2);
container.add(DimOfSis);
container.add(Ativar);
container.add(label1);
container.add(Calcular);
container.add(DataTable);
for ( int i = 0; i < 10 ; i ++ ){
for ( int j = 0 ; j < 10 ; j++) {
DataTable.setValueAt("0",i,j);
myHandler handler = new myHandler();
Calcular.addActionListener(handler);
Ativar.addActionListener(handler);
setSize( 500 , 500 );
setVisible( true );
public static void main ( String args[] ){
MathF2 application = new MathF2();
application.addWindowListener(
new WindowAdapter(){
public void windowClosing (WindowEvent event)
System.exit( 0 );
private class myHandler implements ActionListener {
public void actionPerformed ( ActionEvent event ){
if ( event.getSource()== Calcular ) {
if ( event.getSource()== Ativar ) {
//dimensiona a Matriz A
if (dimensionado == false) {
if (DimOfSis.getText()=="0") {
value = 2;
} else {
value = Integer.parseInt(DimOfSis.getText());
dimensionado = true;
Ativar.setEnabled(false);
System.out.println(value);
} else {
Ativar.setEnabled(false);
Calcular.setEnabled(true);
podecalc = true;
try {
InitValores( DataTable, value );
} catch (Exception e) {
System.out.println("Erro ao criar matriz" + e );
private class myHandler2 implements ItemListener {
public void itemStateChanged( ItemEvent event ){
private void InitValores( JTable table, int n ) {
A = new double[n][n];
B = new double[n];
javax.swing.table.TableModel model = table.getModel();
for ( int i = 0 ; i < n ; i++ ){
for (int j = 0 ; j < n ; j++ ){
Object temp1 = model.getValueAt(i,j);
String temp2 = String.valueOf(temp1);
A[i][j] = Double.parseDouble(temp2);

What I did is set up a :
// This code will setup a listener for the table to handle a selection
players.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
ListSelectionModel rowSM = players.getSelectionModel();
rowSM.addListSelectionListener(new Delete_Player_row_Selection(this));
//Class will take the event and call a method inside the Delete_Player object.
class Delete_Player_row_Selection
implements javax.swing.event.ListSelectionListener
Delete_Player adaptee;
Delete_Player_row_Selection (Delete_Player temp)
adaptee = temp;
public void valueChanged (ListSelectionEvent listSelectionEvent)
adaptee.row_Selection(listSelectionEvent);
in the row_Selection function
if(ex.getValueIsAdjusting()) //To remove double selection
return;
ListSelectionModel lsm = (ListSelectionModel) ex.getSource();
if(lsm.isSelectionEmpty())
System.out.println("EMtpy");
else
int selected_row = lsm.getMinSelectionIndex();
ResultSetTableModel model = (ResultSetTableModel) players.getModel();
String name = (String) model.getValueAt(selected_row, 1);
Integer id = (Integer) model.getValueAt(selected_row, 3);
This is how I got info out of a table when the user selected it

Problem with event handling

Hello all,
I have a problem with event handling. I have two buttons in my GUI application with the same name.They are instance variables of two different objects of the same class and are put together in the one GUI.And their actionlisteners are registered with the same GUI. How can I differentiate between these two buttons?
To be more eloborate here is a basic definition of my classes
class SystemPanel{
         SystemPanel(FTP ftp){ app = ftp};
         FTP app;
         private JButton b = new JButton("ChgDir");
        b.addActionListener(app);
class FTP extends JFrame implements ActionListener{
           SystemPanel rem = new SystemPanel(this);
           SystemPanel loc = new SystemPanel(this);
           FTP(){
                   add(rem);
                   add(loc);
                   pack();
                   show();
       void actionPerformed(ActionEvent evt){
        /*HOW WILL I BE ABLE TO KNOW WHICH BUTTON WAS PRESSED AS THEY
           BOTH HAVE SAME ID AND getSouce() ?
           In this case..it if was from rem or loc ?
} It would be really helpful if anyone could help me in this regard..
Thanks
Hari Vigensh

Hi levi,
Thankx..
I solved the problem ..using same concept but in a different way..
One thing i wanted to make clear is that the two buttons are in the SAME CLASS and i am forming 2 different objects of the SAME class and then putting them in a GUI.THERE IS NO b and C. there is just two instances of b which belong to the SAME CLASS..
So the code
private JButton b = new JButton("ChgDir");
b.setActionCommand ("1");
wont work as both the instances would have the label "ChgDir" and have setActionCommand set to 1!!!!
Actually I have an array of buttons..So I solved the prob by writting a function caled setActionCmdRemote that would just set the action commands of one object of the class differently ..here is the code
public void setActionCommandsRemote()
     for(int i = 0 ; i <cmdButtons.length ; i++)
     cmdButtons.setActionCommand((cmdButtons[i].getText())+"Rem");
This just adds "rem" to the existing Actioncommand and i check it as folows in my actionperformed method
     if(button.getActionCommand().equals("DeleteRem") )
                    deleteFileRemote();
      else if(button.getActionCommand().equals("Delete") )
                 deleteFileLocal();Anyway thanx a milion for your help..this was my first posting and I was glad to get a prompt reply!!!

Event Handling - New Approach

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