sale
Class NullDisplay

java.lang.Object
  |
  +--sale.NullDisplay

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 a InvalidDisplayException.

Since:

v2.0

Version:

2.0 27/05/1999

Author:

Steffen Zschaler

Field Summary

static NullDisplay

s_ndGlobal The singleton NullDisplay used in the entire application.

Method Summary

void	addFormSheetListener(FormSheetListener fsl) Throw a InvalidDisplayException.
void	closeFormSheet() Throw a InvalidDisplayException.
boolean	isUseableDisplay() Return false to indicate this display is not useable.
void	popUpFormSheet(FormSheet fs) Throw a InvalidDisplayException.
void	removeFormSheetListener(FormSheetListener fsl) Throw a InvalidDisplayException.
void	setFormSheet(FormSheet fs) Throw a InvalidDisplayException.
void	setMenuSheet(MenuSheet ms) Throw a 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)

Throw a InvalidDisplayException.

Override:

Never.

Specified by:

setFormSheet in interface Display

closeFormSheet

public final void closeFormSheet()

Throw a InvalidDisplayException.

Override:

Never.

Specified by:

closeFormSheet in interface Display

popUpFormSheet

public final void popUpFormSheet(FormSheet fs)

Throw a InvalidDisplayException.

Override:

Never.

Specified by:

popUpFormSheet in interface Display

setMenuSheet

public final void setMenuSheet(MenuSheet ms)

Throw a InvalidDisplayException.

Override:

Never.

Specified by:

setMenuSheet in interface Display

isUseableDisplay

public final boolean isUseableDisplay()

Return false to indicate this display is not useable.

Override:

Never.

Specified by:

isUseableDisplay in interface Display

addFormSheetListener

public final void addFormSheetListener(FormSheetListener fsl)

Throw a InvalidDisplayException.

Override:

Never.

Specified by:

addFormSheetListener in interface Display

removeFormSheetListener

public void removeFormSheetListener(FormSheetListener fsl)

Throw a InvalidDisplayException.

Override:

Never.

Specified by:

removeFormSheetListener in interface Display