Assume I do:
ThingWhichKnowsItsContainer *a = [[ ThingWhichKnowsItsContainer alloc ] init];
NSArray *array = @[ a ];
a.theContainer = array;
NSData *d = [ NSKeyedArchiver archivedDataWithRootObject: array];
NSArray *unarchivedArray = [ MyVeryOwnUnarchiver: unarchiveObjectWithData: d ];
MyVeryOwnUnarchiver has a method like:
- (id)objectForArchiveIndex: (NSNumber *n)
{
id result = dictionaryOfThingsDone[n];
if ( result == nil ) // create and remember result
{
// assume n stands for the array:
NSMutableArray *tempMutable = [ NSMutableArray array];
dictionaryOfThingsDone[n] = tempMutable;
// needed to be done here so that later stuff (like
ThingWhichKnowsItsContainer) do not create another array, but use this one.
for all archiveIndices "i" in "n" do:
{
id x = [ self objectForArchiveIndex: i ];
[ tempMutable addObject: x ];
}
result = [ tempMutable copy]; // result must be NSArray, not
NSMutableArray
};
return result;
}
When it comes to ThingWhichKnowsItsContainer it will (using my
dictionaryOfThingsDone) set myContainer = tempMutable.
So I get an unarchivedArray which contains a ThingWhichKnowsItsContainer which
knows tempMutable but NOT it's container which is unarchivedArray.
How to fix this?
NSKeyedUnarchiver probably just uses something like: [tempMutable
makeImmutable] but this is not a public method.
Gerriet.
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