@Override
public IStatus undoOperation(
IUndoableOperation operation, IProgressMonitor monitor, IAdaptable info)
throws ExecutionException {
Assert.isNotNull(operation);
IStatus status;
if (operation.canUndo()) {
status = doUndo(monitor, info, operation);
} else {
if (DEBUG_OPERATION_HISTORY_UNEXPECTED) {
Tracing.printTrace(
"OPERATIONHISTORY",
"Undo operation not valid - " + operation); // $NON-NLS-1$//$NON-NLS-2$
}
status = IOperationHistory.OPERATION_INVALID_STATUS;
}
return status;
}
@Override
public IStatus undo(IUndoContext context, IProgressMonitor monitor, IAdaptable info)
throws ExecutionException {
Assert.isNotNull(context);
IUndoableOperation operation = getUndoOperation(context);
// info if there is no operation
if (operation == null) {
return IOperationHistory.NOTHING_TO_UNDO_STATUS;
}
// error if operation is invalid
if (!operation.canUndo()) {
if (DEBUG_OPERATION_HISTORY_UNEXPECTED) {
Tracing.printTrace(
"OPERATIONHISTORY",
"Undo operation not valid - " + operation); // $NON-NLS-1$ //$NON-NLS-2$
}
return IOperationHistory.OPERATION_INVALID_STATUS;
}
return doUndo(monitor, info, operation);
}
@Override
public boolean canUndo(IUndoContext context) {
// null context is allowed and passed through
IUndoableOperation operation = getUndoOperation(context);
return (operation != null && operation.canUndo());
}
