Class Command

Object
   |
   +--OObject
         |
         +--Command

Direct Known Subclasses:

SaveAllAccountChangesCmd, SelectFirstUnreconciledCmd, SelectAccountCmd, CancelAllAccountChangesCmd, CloseWindowIfDataSavedCmd, RatsCmd, LoadAccountDataCmd, ScalarEditCmd

class Command

extends OObject

This class acts as the abstract base class for each Command (ala Command design pattern).

 Subclasses of Command should define/override:
  (1) the constructor to load the do/undo/redo context data
      which should set the "valid" attribute to a negative
      number if the command cant properly be initiated. 
  (2) the doit() method which executes the command
  (3) the undo() method which "rolls back" the command
  (4) the redo() method which "un-rolls-back" the command
  (5) canUndo property if this cmd is only meant for mutex

 FYI, REDO would be different than DO, for example, in the case
 that DO had to do a database search to get a value, but REDO
 could simply use that saved value without re-searching for it.

- konstructor()

Constructor Detail

Command

Command()

See:
- konstructor()
Author: Bruce Wallace (PolyGlotInc.com)
Version: 1.0

details

String details()

return details of this command for user viewing

DOIT

void DOIT()

"DO" this command if in the proper state.

doit

void doit()

"Do command" logic

isInvalid

boolean isInvalid()

return true iff this command should not even be started

konstructor

void konstructor( <String> optName )

Parameters:
optName - optional name of this instance

redo

void redo()

"command REDO" logic. Default is to just call doit()

REDO

void REDO()

"REDO" this command if in the proper state.

syncDoIt

void syncDoIt()

synchronized this.DOIT()

syncReDo

void syncReDo()

synchronized this.REDO()

syncUnDo

void syncUnDo()

synchronized this.UNDO()

toString

String toString()

return THIS formatted as string

undo

void undo()

"command UNDO" logic

UNDO

void UNDO()

"UNDO" this command if in the proper state.