@Override
public void add(IUndoableOperation operation) {
Assert.isNotNull(operation);
/*
* If we are in the middle of executing an open batching operation, and
* this is not that operation, then we need only add the context of the
* new operation to the batch. The operation itself is disposed since we
* will never undo or redo it. We consider it to be triggered by the
* batching operation and assume that its undo will be triggered by the
* batching operation undo.
*/
synchronized (openCompositeLock) {
if (openComposite != null && openComposite != operation) {
openComposite.add(operation);
return;
}
}
if (checkUndoLimit(operation)) {
synchronized (undoRedoHistoryLock) {
undoList.add(operation);
}
notifyAdd(operation);
// flush redo stack for related contexts
IUndoContext[] contexts = operation.getContexts();
for (int i = 0; i < contexts.length; i++) {
flushRedo(contexts[i]);
}
} else {
// Dispose the operation since we will not have a reference to it.
operation.dispose();
}
}
@Override
public void replaceOperation(IUndoableOperation operation, IUndoableOperation[] replacements) {
// check the undo history first.
boolean inUndo = false;
synchronized (undoRedoHistoryLock) {
int index = undoList.indexOf(operation);
if (index > -1) {
inUndo = true;
undoList.remove(operation);
// notify listeners after the lock on undoList is released
ArrayList<IUndoContext> allContexts = new ArrayList<>(replacements.length);
for (int i = 0; i < replacements.length; i++) {
IUndoContext[] opContexts = replacements[i].getContexts();
for (int j = 0; j < opContexts.length; j++) {
allContexts.add(opContexts[j]);
}
undoList.add(index, replacements[i]);
// notify listeners after the lock on the history is
// released
}
// recheck all the limits. We do this at the end so the index
// doesn't change during replacement
for (int i = 0; i < allContexts.size(); i++) {
IUndoContext context = allContexts.get(i);
forceUndoLimit(context, getLimit(context));
}
}
}
if (inUndo) {
// notify listeners of operations added and removed
internalRemove(operation);
for (int i = 0; i < replacements.length; i++) {
notifyAdd(replacements[i]);
}
return;
}
// operation was not in the undo history. Check the redo history.
synchronized (undoRedoHistoryLock) {
int index = redoList.indexOf(operation);
if (index == -1) {
return;
}
ArrayList<IUndoContext> allContexts = new ArrayList<>(replacements.length);
redoList.remove(operation);
// notify listeners after we release the lock on redoList
for (int i = 0; i < replacements.length; i++) {
IUndoContext[] opContexts = replacements[i].getContexts();
for (int j = 0; j < opContexts.length; j++) {
allContexts.add(opContexts[j]);
}
redoList.add(index, replacements[i]);
// notify listeners after we release the lock on redoList
}
// recheck all the limits. We do this at the end so the index
// doesn't change during replacement
for (int i = 0; i < allContexts.size(); i++) {
IUndoContext context = allContexts.get(i);
forceRedoLimit(context, getLimit(context));
}
}
// send listener notifications after we release the lock on the history
internalRemove(operation);
for (int i = 0; i < replacements.length; i++) {
notifyAdd(replacements[i]);
}
}
