Faking large arrays in bindings to satisfy sparse data...
Faking large arrays in bindings to satisfy sparse data...
- Subject: Faking large arrays in bindings to satisfy sparse data...
- From: アンドレ（Andre） <email@hidden>
- Date: Sat, 19 Mar 2005 18:01:56 -0800
Hi,
I'm currently working on a project that uses bindings for structured
data that may get very large.
In order to deal with this I have devised a class that encapsulates a
sparse array.
The only problem is that even though it contains a to-many relation
with its contents,
when binding to an array controller, I am wondering if I can fake the
count of objects...
For example, say I only have two items in my sparse array, but the
second item is in position 33.
If I have my object return countOf<Key> to return 33 would that be good
enough?
When the controller gets a change to another position below 33 I could
handle it and
abstract it with objectIn<Key>AtIndex: etc, but what I am worried about
is anything above
33.... what would happen if I returned INT_MAX for countOf<key> would
that cause the
NSArrayController to allocate space for 2 billion items?? Or is it
smart enough?
Is there any way to do this besides getting all the items in a given
array, iterate their "position" key
to find the ones I want changed or removed??
I thought about an NSDictionary, but this has speed disadvantages as
each key must be compared in unicode
when all I need is to compare numerals (positions in the sparse
array)....
I really want to use bindings!!
Please let me know if anyone has an idea.
I appreciate it.
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