def performUndo(null):
repoCaller = Repo()
indexOfOperations = repoCaller.getIndexOfOperations()
listOfOperations = repoCaller.getListOfOperations()
commands = {
"removeB": removeABook,
"removeC": removeAClient,
"addB": addABook,
"addC": addAClient,
"updateB": updateABook,
"updateC": updateAClient
}
if indexOfOperations >= 0:
commands[Undo.getFuntion(listOfOperations[indexOfOperations])](
Undo.getParameters(listOfOperations[indexOfOperations]))
repoCaller.decrementIndex()
repoCaller.setRedoTrue()
else:
return "Cannot undo anymore"
return False
def performRedo(null):
repoCaller = Repo()
listOfOperations = repoCaller.getListOfOperations()
canRedo = repoCaller.getRedoState()
if canRedo == True:
repoCaller.incrementIndex()
index = repoCaller.getIndexOfOperations()
commands = {
"removeB": addABook,
"removeC": addAClient,
"addB": removeABook,
"addC": removeAClient,
"updateB": updateABook,
"updateC": updateAClient
}
if "update" in Undo.getFuntion(listOfOperations[index]):
commands[Undo.getFuntion(listOfOperations[index])](
Undo.getParametersUpdate(listOfOperations[index]))
else:
commands[Undo.getFuntion(listOfOperations[index])](
Undo.getParameters(listOfOperations[index]))
return False
