org.gvsig.tools.undo.command.impl
Class DefaultUndoRedoCommandStack

java.lang.Object
  org.gvsig.tools.undo.command.impl.DefaultUndoRedoCommandStack

All Implemented Interfaces:

Observable, WeakReferencingObservable, UndoRedoCommandStack, UndoRedoStack

public class DefaultUndoRedoCommandStack
extends Object
implements UndoRedoCommandStack

Clase en memoria para registrar y gestionar los comandos que vamos realizando. La forma en que ha sido implementada esta clase, en vez de una única lista para albergar los comandos de deshacer(undos) y los de rehacer(redos), se ha optado por dos pilas una para deshacer(undos) y otra para rehacer(redos), de esta forma : Cuando se añade un nuevo comando, se inserta este a la pila de deshacer(undos) y se borra de la de rehacer(redos). Si se realiza un deshacer se desapila este comando de la pila deshacer(undos) y se apila en la de rehacer(redos). Y de la misma forma cuando se realiza un rehacer se desapila este comando de la pila de rehacer(redos) y pasa a la de deshacer(undos).

Author:

Vicente Caballero Navarro

Constructor Summary

DefaultUndoRedoCommandStack()

Method Summary

void	add(Command command)
void	addObserver(Observer o)
boolean	canRedo() If a redo can be performed on the stack.
boolean	canUndo() If an undo can be performed on the stack.
void	clear()
void	deleteObserver(Observer o)
void	deleteObservers()
void	endComplex()
Command	getNextRedoCommand()
Command	getNextUndoCommand()
List	getRedoInfos() Returns the list of UndoRedoInfo in the REDO stack
List	getUndoInfos() Returns the list of UndoRedoInfo in the UNDO stack
boolean	inComplex()
void	redo() Re-does the following redoable elements.
void	redo(int commands) Re-does a number of the following redoable element.
int	size()
void	startComplex(String description)
void	undo() Undoes the following undoable elements.
void	undo(int commands) Undoes a number of the following undoable elements.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultUndoRedoCommandStack

public DefaultUndoRedoCommandStack()

Method Detail

add

public void add(Command command)

Specified by:

add in interface UndoRedoCommandStack

undo

public void undo()
          throws UndoException

Description copied from interface: UndoRedoStack

Undoes the following undoable elements.

Specified by:

undo in interface UndoRedoStack

Throws:

UndoException - if there is an error performing de undo element

redo

public void redo()
          throws RedoException

Description copied from interface: UndoRedoStack

Re-does the following redoable elements.

Specified by:

redo in interface UndoRedoStack

Throws:

RedoException - if there is an error performing de redo element

redo

public void redo(int commands)
          throws RedoException

Description copied from interface: UndoRedoStack

Re-does a number of the following redoable element.

Specified by:

redo in interface UndoRedoStack

Parameters:

commands - the number of elements to redo

Throws:

RedoException - if there is an error performing de redo element

undo

public void undo(int commands)
          throws UndoException

Description copied from interface: UndoRedoStack

Undoes a number of the following undoable elements.

Specified by:

undo in interface UndoRedoStack

Parameters:

commands - the number of elements to undo

Throws:

UndoException - if there is an error performing de undo element

canUndo

public boolean canUndo()

Description copied from interface: UndoRedoStack

If an undo can be performed on the stack.

Specified by:

canUndo in interface UndoRedoStack

Returns:

an undo can be performed

canRedo

public boolean canRedo()

Description copied from interface: UndoRedoStack

If a redo can be performed on the stack.

Specified by:

canRedo in interface UndoRedoStack

Returns:

a redo can be performed

getUndoInfos

public List getUndoInfos()

Description copied from interface: UndoRedoStack

Returns the list of UndoRedoInfo in the UNDO stack

Specified by:

getUndoInfos in interface UndoRedoStack

Returns:

list of UndoRedoInfo in the UNDO stack

getRedoInfos

public List getRedoInfos()

Description copied from interface: UndoRedoStack

Returns the list of UndoRedoInfo in the REDO stack

Specified by:

getRedoInfos in interface UndoRedoStack

Returns:

list of UndoRedoInfo in the REDO stack

size

public int size()

Specified by:

size in interface UndoRedoCommandStack

clear

public void clear()

Specified by:

clear in interface UndoRedoCommandStack

getNextUndoCommand

public Command getNextUndoCommand()

Specified by:

getNextUndoCommand in interface UndoRedoCommandStack

getNextRedoCommand

public Command getNextRedoCommand()

Specified by:

getNextRedoCommand in interface UndoRedoCommandStack

addObserver

public void addObserver(Observer o)

Specified by:

addObserver in interface Observable

deleteObserver

public void deleteObserver(Observer o)

Specified by:

deleteObserver in interface Observable

deleteObservers

public void deleteObservers()

Specified by:

deleteObservers in interface Observable

endComplex

public void endComplex()

Specified by:

endComplex in interface UndoRedoCommandStack

startComplex

public void startComplex(String description)

Specified by:

startComplex in interface UndoRedoCommandStack

inComplex

public boolean inComplex()

Specified by:

inComplex in interface UndoRedoCommandStack