Re: JMIUNDO SPI 0.2

Brian Smith wrote:
> 
> // ... TestClass tc = ...;
> Collection c = tc.getUntrackable().clone();
> // ... change c as you wish
> tc.setUntrackable(c);

Okay, I wasn't thinking: clone() will probably return another immutable 
collection :(. So, let me try again. Let's say that c.untrackable 
contains { { 'Hello', 'Holger' }, { 'I', 'love', 'undo' } } and you want 
to change the 'Hello' to 'Goodbye'. Then you would have to do something 
like (untested):

// a is a mutable list of immutable collections
ArrayList a = new ArrayList(tc.getUntrackable());

ArrayList a0 = new ArrayList((Collection) a.get(0));

a0.set(0, "Goodbye");	// replace 'Hello' with 'Goodbye'

// replace { 'Hello', 'Holger' } with { 'Goodbye', 'Holger' }
a.set(0, a0);

tc.setUntrackable(a); // This will make an immutable deep copy of a

Notice that there are 2+3 copies of collections being made during this 
operation: we made two copies ourselves and tc.setUntrackable(a) made up 
to three copies (likely, at least two).

- Brian