/*
* Determine whether the operation in question is still valid.
*/
private IStatus proceedWithOperation(
final IUndoableOperation operation,
final IOperationHistory history,
final IAdaptable uiInfo,
final int doing) {
// return immediately if the operation is not relevant
if (!operation.hasContext(context)) {
return Status.OK_STATUS;
}
// if the operation does not support advanced validation,
// then we assume it is valid.
if (doing == EXECUTING) {
if (!(operation instanceof IAdvancedUndoableOperation2)) {
return Status.OK_STATUS;
}
} else {
if (!(operation instanceof IAdvancedUndoableOperation)) {
return Status.OK_STATUS;
}
}
// The next two methods make a number of UI calls, so we wrap the
// whole thing up in a syncExec.
final IStatus[] status = new IStatus[1];
Workbench.getInstance()
.getDisplay()
.syncExec(
new Runnable() {
public void run() {
// Compute the undoable or redoable status
status[0] = computeOperationStatus(operation, history, uiInfo, doing);
// Report non-OK statuses to the user. In some cases, the user
// may choose to proceed, and the returned status will be
// different than what is reported.
if (!status[0].isOK()) {
status[0] = reportAndInterpretStatus(status[0], uiInfo, operation, doing);
}
}
});
// If the operation is still not OK, inform the history that the
// operation has changed, since it was previously believed to be valid.
// We rely here on the ability of an IAdvancedUndoableOperation to
// correctly report canUndo() and canRedo() once the undoable and
// redoable status have been computed.
if (!status[0].isOK()) {
history.operationChanged(operation);
}
return status[0];
}
