import java.awt.*;
import java.awt.event.*;
import java.lang.*;
import java.util.*;
public class JPL_Rolo extends Frame {
// The primary key of the row that is current onscreen.
//
int current_row = 0;
// TextField objects for each column.
//
TextField fld_name, fld_address, fld_city, fld_state, fld_zip, fld_id;
// Add or Edit mode.
//
String edit_status;
// a layout manager for the Frame
//
GridBagLayout gb = new GridBagLayout();
// Action buttons.
//
Button next, previous, quit, save, newrow, edit, cancel, delete;
// A Panel for the action buttons.
//
Panel actionbuttons;
/**
* Construct a new instance of JPL_Rolo.
*/
public JPL_Rolo(String[] argv) {
CreateForm();
addWindowListener(new WinEventHandler() );
}
public void CreateForm() {
// set the layout for the frame
//
this.setLayout(gb);
// this is the offset within the GridBagLayout. If
// I want the next object on a different line, I
// postincrement. If not, I don't.
//
int i = 0;
// Add a text field for the name.
//
AddToFrame(new Label("Name:"), 0, i);
fld_name = new TextField(20);
fld_name.setEditable(false);
AddToFrame(fld_name, 1, i++);
// The address.
//
AddToFrame(new Label("Address:"), 0, i);
fld_address = new TextField(35);
fld_address.setEditable(false);
AddToFrame(fld_address, 1, i++);
// The City. I'm not going to increment i, so the
// next field will show up on the same line.
//
AddToFrame(new Label("City:"), 0, i);
fld_city = new TextField(20);
fld_city.setEditable(false);
AddToFrame(fld_city, 1, i);
// The State.
//
AddToFrame(new Label("State:"), 2, i);
fld_state = new TextField(2);
fld_state.setEditable(false);
AddToFrame(fld_state, 3, i++);
// The Zip Code.
//
AddToFrame(new Label("Zip:"), 0, i);
fld_zip = new TextField(11);
fld_zip.setEditable(false);
AddToFrame(fld_zip, 1, i++);
// The id - this is always read-only.
//
AddToFrame(new Label("Id:"), 0, i);
fld_id = new TextField(4);
fld_id.setEditable(false);
AddToFrame(fld_id, 1, i++);
// create the button panel and give it a FlowLayout
//
actionbuttons = new Panel();
actionbuttons.setLayout(new FlowLayout(FlowLayout.CENTER, 5, 5));
// Add the button panel to the Frame. The AddToFrame
// method isn't really set up to handle this sort of
// panel, so we will go through the tedious process
// of managing the GridBagConstraints...
//
GridBagConstraints c = new GridBagConstraints();
c.gridwidth = 3; c.gridheight = 1;
c.fill = GridBagConstraints.NONE;
c.anchor = GridBagConstraints.CENTER;
c.weightx = 0.0; c.weighty = 0.0;
c.gridx = 0; c.gridy = i;
((GridBagLayout)this.getLayout()).setConstraints(actionbuttons, c);
this.add(actionbuttons);
// instantiate and add each of the buttons
//
previous = new Button("Previous");
actionbuttons.add(previous);
previous.addActionListener( new PrevRowHandler() );
next = new Button("Next");
actionbuttons.add(next);
next.addActionListener( new NextRowHandler() );
quit = new Button("Quit");
actionbuttons.add(quit);
quit.addActionListener( new QuitHandler() );
newrow = new Button("New");
actionbuttons.add(newrow);
newrow.addActionListener( new NewRowHandler() );
edit = new Button("Edit");
actionbuttons.add(edit);
edit.addActionListener( new EditRowHandler() );
delete = new Button("Delete");
actionbuttons.add(delete);
delete.addActionListener( new DeleteRowHandler() );
// save and cancel are disabled until the user
// is adding or editing.
//
save = new Button("Save");
actionbuttons.add(save);
save.setEnabled(false);
save.addActionListener( new SaveHandler() );
cancel = new Button("Cancel");
actionbuttons.add(cancel);
cancel.setEnabled(false);
cancel.addActionListener( new CancelHandler() );
// Invoke getRow() to display the first row in the table.
//
getRow(0);
}
/**
* Return the id of the current row.
*/
public int getCurrentRowVal() {
return current_row;
}
public void setCols(String name, String address, String city, String state, String zip, String id) {
clearForm();
fld_name.setText(name);
fld_address.setText(address);
fld_city.setText(city);
fld_state.setText(state);
fld_zip.setText(zip);
fld_id.setText(id);
current_row = Integer.parseInt(id);
}
public void setCurrentRow(int r) {
current_row = r;
}
public String getName() { return fld_name.getText(); }
public String getAddress() { return fld_address.getText(); }
public String getCity() { return fld_city.getText(); }
public String getState() { return fld_state.getText(); }
public String getZip() { return fld_zip.getText(); }
public String getId() { return fld_id.getText(); }
/**
* This eventhandler will move to the previous row.
*/
class PrevRowHandler implements ActionListener {
public void actionPerformed( ActionEvent e) {
getRow(-1);
}
}
/**
* This eventhandler will move to the next row.
*/
class NextRowHandler implements ActionListener {
public void actionPerformed( ActionEvent e) {
getRow(1);
}
}
/**
* This eventhandler will terminate the application.
*/
class QuitHandler implements ActionListener {
public void actionPerformed( ActionEvent e) {
System.exit(0);
}
}
/**
* This eventhandler will display a blank record and put
* this application in new record mode.
*/
class NewRowHandler implements ActionListener {
public void actionPerformed( ActionEvent e) {
clearForm();
edit_status = "new";
setEdit();
}
}
/**
* This eventhandler will put the application in edit
* mode (for the current row).
*/
class EditRowHandler implements ActionListener {
public void actionPerformed( ActionEvent e) {
edit_status = "edit";
setEdit();
}
}
/**
* This eventhandler will delete the current row.
*/
class DeleteRowHandler implements ActionListener {
public void actionPerformed( ActionEvent e) {
delRow();
}
}
/**
* This eventhandler will save (update or insert) the
* current record.
*/
class SaveHandler implements ActionListener {
public void actionPerformed( ActionEvent e) {
if (edit_status.equals("new")) {
saveIt();
}
if (edit_status.equals("edit")) {
updateRow();
}
// set the edit_status to "browse", and call setBrowse()
//
edit_status = "browse";
setBrowse();
}
}
/**
* This eventhandler cancels any pending edit.
*/
class CancelHandler implements ActionListener {
public void actionPerformed( ActionEvent e) {
// if it was new, make sure that they can't edit the
// id field...
if (edit_status.equals("new")) {
fld_id.setEditable(false);
}
// return the edit_status to browse, call getRow()
// to retrieve the row they were looking at
// before editing or adding, and call setBrowse()
//
edit_status = "browse";
getRow(0);
setBrowse();
}
}
// This is the event handler to deal with cases where
// the user closes the window with a window control.
//
class WinEventHandler extends WindowAdapter {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
}
/**
* clearForm()
*/
protected void clearForm () {
fld_name.setText("");
fld_address.setText("");
fld_city.setText("");
fld_state.setText("");
fld_zip.setText("");
fld_id.setText("");
}
/**
* AddToFrame()
* A convenience method to wrap the living hell
* that is GridBagConstraints()
*/
protected void AddToFrame (Component item, int x, int y) {
// some sane layout defaults.
//
GridBagConstraints c = new GridBagConstraints();
c.gridwidth = 1; c.gridheight = 1;
c.fill = GridBagConstraints.NONE;
c.anchor = GridBagConstraints.NORTHWEST;
c.weightx = 0.0; c.weighty = 0.0;
// set the grid coordinates
//
c.gridx = x; c.gridy = y;
// set the constraints, and add the item to the layout
//
((GridBagLayout)this.getLayout()).setConstraints(item, c);
this.add(item);
}
/**
* setEdit()
*
* prepare the form for editing/adding
*/
protected void setEdit () {
// disable all these buttons
//
next.setEnabled(false);
previous.setEnabled(false);
newrow.setEnabled(false);
edit.setEnabled(false);
delete.setEnabled(false);
// set everything except the id to be editable
//
fld_name.setEditable(true);
fld_address.setEditable(true);
fld_city.setEditable(true);
fld_state.setEditable(true);
fld_zip.setEditable(true);
// enable these two buttons
//
save.setEnabled(true);
cancel.setEnabled(true);
}
/**
* setBrowse()
*
* prepare the form for viewing
*
*/
protected void setBrowse() {
// enable all these buttons
//
next.setEnabled(true);
previous.setEnabled(true);
newrow.setEnabled(true);
edit.setEnabled(true);
delete.setEnabled(true);
// disable the fields
//
fld_name.setEditable(false);
fld_address.setEditable(false);
fld_city.setEditable(false);
fld_state.setEditable(false);
fld_zip.setEditable(false);
fld_id.setEditable(false);
// disable these two buttons
//
save.setEnabled(false);
cancel.setEnabled(false);
}
perl void delRow() {{
my $id = $self->getId____s();
$sql = qq[delete from cardfile ] .
qq[where (id = $id)];
use Sprite;
my $rdb = new Sprite();
my @data = $rdb->sql($sql);
$rdb->close("cardfile");
my $status = shift @data;
if (!$status) {
print STDERR "Bummer - couldn't execute query!\n";
die;
}
$self->setCurrentRow__I(0);
$self->getRow__I(0);
}}
perl void updateRow() {{
my $name = $self->getName____s();
my $address = $self->getAddress____s();
my $city = $self->getCity____s();
my $state = $self->getState____s();
my $zip = $self->getZip____s();
my $id = $self->getId____s();
$sql = qq[update cardfile ] .
qq[set name = ('$name'), ] .
qq[set address = ('$address'), ] .
qq[set city = ('$city'), ] .
qq[set state = ('$state'), ] .
qq[set zip = ('$zip') ] .
qq[where (id = $id)];
use Sprite;
my $rdb = new Sprite();
my @data = $rdb->sql($sql);
$rdb->close("cardfile");
my $status = shift @data;
if (!$status) {
print STDERR "Bummer - couldn't execute query!\n";
die;
}
}}
/**
* getRow()
*
* This method is used to either fetch this current row,
* in which case it is given an argument of zero, or it
* can be used to move relative to the current row, in
* which case it must be given an argument of 1 or -1.
*
*/
perl void getRow(int direction) {{
use Sprite;
my $rdb = new Sprite();
my $nextid = $self->getCurrentRowVal____I() + $direction;
my $op;
if ($direction == -1) {
$op = "<=";
} else {
$op = ">=";
}
my $sql = "select name, address, city, " .
"state, zip, id from cardfile " .
"where id $op $nextid";
my @data = $rdb->sql($sql);
$rdb->close("cardfile");
my $status = shift @data;
if (!$status) {
print STDERR "Bummer - couldn't execute query!\n";
die;
}
my $numrows = scalar(@data);
if (!$numrows) {
print STDERR "End of file reached.\n";
return;
}
my $index;
if ($direction == -1) {
$index = $#data;
} else {
$index = 0;
}
my($name, $address, $city, $state, $zip, $id) = @{$data[$index]};
$self->setCols__ssssss($name, $address, $city, $state, $zip, $id);
}}
perl void saveIt() {{
use Sprite;
my $rdb = new Sprite();
my @data = $rdb->sql("select id, name from cardfile");
my $status = shift @data;
if (!$status) {
print STDERR "Bummer - couldn't execute query!\n";
die;
}
my @ids;
foreach $record (@data) {
my ($id, $name) = split (/\0/, $record, 2);
push @ids, $id;
}
@ids = sort @ids;
my $newid = $ids[$#ids] + 1;
my $name = $self->getName____s();
my $address = $self->getAddress____s();
my $city = $self->getCity____s();
my $state = $self->getState____s();
my $zip = $self->getZip____s();
my $sql = "insert into cardfile (name, address, city, state, zip, id) values ('$name', '$address', '$city', '$state', '$zip', $newid)";
@data = $rdb->sql($sql);
$rdb->close("cardfile");
$status = shift @data;
if (!$status) {
print STDERR "Bummer - couldn't execute insert!\n";
die;
}
$self->setCurrentRow__I($newid);
}}
public static void main(String[] args) {
// make a new JPL_Rolo, pack() it and show() it.
JPL_Rolo cardfile = new JPL_Rolo(args);
cardfile.pack();
cardfile.show();
}
}
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