private Collection<Document> collectReadOnlyDocuments() {
Collection<DocumentReference> affectedDocument = myUndoableGroup.getAffectedDocuments();
Collection<Document> readOnlyDocs = new ArrayList<Document>();
for (DocumentReference ref : affectedDocument) {
if (ref instanceof DocumentReferenceByDocument) {
Document doc = ref.getDocument();
if (doc != null && !doc.isWritable()) readOnlyDocs.add(doc);
}
}
return readOnlyDocs;
}
private LinkedList<UndoableGroup> doGetStackForDocument(DocumentReference r) {
// If document is not associated with file, we have to store its stack in document
// itself to avoid memory leaks caused by holding stacks of all documents, ever created, here.
// And to know, what documents do exist now, we have to maintain weak reference list of them.
Document d = r.getDocument();
LinkedList<UndoableGroup> result = d.getUserData(STACK_IN_DOCUMENT_KEY);
if (result == null) {
result = new LinkedList<UndoableGroup>();
d.putUserData(STACK_IN_DOCUMENT_KEY, result);
myDocumentsWithStacks.add(d);
}
return result;
}
public void clearStacks(boolean clearGlobal, Set<DocumentReference> affectedDocuments) {
if (clearGlobal) myGlobalStack.clear();
for (DocumentReference each : affectedDocuments) {
List<UndoableGroup> stack = getStack(each);
stack.clear();
if (each.getFile() != null) {
myDocumentStacks.remove(each);
} else {
Document d = each.getDocument();
d.putUserData(STACK_IN_DOCUMENT_KEY, null);
myDocumentsWithStacks.remove(d);
}
}
}