sale
Class NullDisplay

java.lang.Object
  sale.NullDisplay

All Implemented Interfaces:

Display

public final class NullDisplay
extends Object
implements Display

A dummy display, that cannot display anything. This display is used for background processes that must not display any Form- or MenuSheets. All methods of this display, except isUseableDisplay() throw an InvalidDisplayException.

Since:

v2.0

Author:

Steffen Zschaler

Field Summary

static NullDisplay

s_ndGlobal The singleton NullDisplay used in the entire application.

Method Summary

void	addFormSheetListener(FormSheetListener fsl) Throws an InvalidDisplayException.
void	closeFormSheet() Throws an InvalidDisplayException.
Rectangle	getBounds() Throws an InvalidDisplayException.
FormSheet	getFormSheet() Throws an InvalidDisplayException.
MenuSheet	getMenuSheet() Throws an InvalidDisplayException.
boolean	isUseableDisplay() Returns false to indicate this display is not useable.
void	load(ObjectInputStream ois) Throws an InvalidDisplayException.
void	popUpFormSheet(FormSheet fs) Throws an InvalidDisplayException.
void	removeFormSheetListener(FormSheetListener fsl) Throws an InvalidDisplayException.
void	save(ObjectOutputStream oos) Throws an InvalidDisplayException.
void	setBounds(Rectangle r) Throws an InvalidDisplayException.
void	setFormSheet(FormSheet fs) Throws an InvalidDisplayException.
void	setMenuSheet(MenuSheet ms) Throws an InvalidDisplayException.
void	toFront() Throws an InvalidDisplayException.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

s_ndGlobal

public static NullDisplay s_ndGlobal

The singleton NullDisplay used in the entire application.

Method Detail

setFormSheet

public final void setFormSheet(FormSheet fs)

Throws an InvalidDisplayException.

Specified by:

setFormSheet in interface Display

Parameters:

fs - the FormSheet to be displayed.

Override:

Never

setBounds

public void setBounds(Rectangle r)

Throws an InvalidDisplayException.

Specified by:

setBounds in interface Display

Parameters:

r - the Rectangle that contains the size and position information.

Override:

Never

getBounds

public Rectangle getBounds()

Throws an InvalidDisplayException.

Specified by:

getBounds in interface Display

Override:

Never

getFormSheet

public FormSheet getFormSheet()

Throws an InvalidDisplayException.

Specified by:

getFormSheet in interface Display

Override:

Never

getMenuSheet

public MenuSheet getMenuSheet()

Throws an InvalidDisplayException.

Specified by:

getMenuSheet in interface Display

Override:

Never

closeFormSheet

public final void closeFormSheet()

Throws an InvalidDisplayException.

Specified by:

closeFormSheet in interface Display

Override:

Never

popUpFormSheet

public final void popUpFormSheet(FormSheet fs)

Throws an InvalidDisplayException.

Specified by:

popUpFormSheet in interface Display

Parameters:

fs - the FormSheet to be displayed.

Override:

Never

setMenuSheet

public final void setMenuSheet(MenuSheet ms)

Throws an InvalidDisplayException.

Specified by:

setMenuSheet in interface Display

Parameters:

ms - the MenuSheet to be displayed. null is a valid value and should result in the current MenuSheet being closed.

Override:

Never

isUseableDisplay

public final boolean isUseableDisplay()

Returns false to indicate this display is not useable.

Specified by:

isUseableDisplay in interface Display

Override:

Never

addFormSheetListener

public final void addFormSheetListener(FormSheetListener fsl)

Throws an InvalidDisplayException.

Specified by:

addFormSheetListener in interface Display

Parameters:

fsl - the FormSheetListener to be registered.

Override:

Never

removeFormSheetListener

public void removeFormSheetListener(FormSheetListener fsl)

Throws an InvalidDisplayException.

Specified by:

removeFormSheetListener in interface Display

Parameters:

fsl - the FormSheetListener to be unregistered.

Override:

Never

toFront

public void toFront()

Throws an InvalidDisplayException.

Specified by:

toFront in interface Display

Override:

Never

load

public void load(ObjectInputStream ois)
          throws IOException,
                 ClassNotFoundException

Throws an InvalidDisplayException.

Specified by:

load in interface Display

Parameters:

ois - the stream to read attributes from

Throws:

IOException

ClassNotFoundException

Override:

Never

save

public void save(ObjectOutputStream oos)
          throws IOException

Throws an InvalidDisplayException.

Specified by:

save in interface Display

Parameters:

oos - the stream to write attributes to

Throws:

IOException

Override:

Never