immutable object that holds Objects

Thread view:

Mize-ze - 01 Apr 2007 11:54 GMT

I have an immutable object that needs to hold (Among the rest) two
"Object" objects

for all the mutable objects my object holds I create a "defensive
copy" but what can I do with the "Object" objects? can I somehow clone
them so they can't be changed from outside the object?

BTW: I can't know what is the type of the Object before run-time...
(that's way it is an "Object")

Thanks.

Reply to this Message

Tom Hawtin - 01 Apr 2007 13:28 GMT

> I have an immutable object that needs to hold (Among the rest) two
> "Object" objects
[quoted text clipped - 5 lines]
> BTW: I can't know what is the type of the Object before run-time...
> (that's way it is an "Object")

No.

I suggest using a wrapper interface that can be copied, and a wrapper
implementation for each type of object that you want your immutable to hold.

Tom hawtin

Reply to this Message

Hendrik Maryns - 02 Apr 2007 11:09 GMT

Tom Hawtin schreef:

>> I have an immutable object that needs to hold (Among the rest) two
>> "Object" objects
[quoted text clipped - 11 lines]
> implementation for each type of object that you want your immutable to
> hold.

Indeed, for inspiration, have a look at Collections.unmodifiableX(X)
where X is Set Collection or Map. Or maybe that is what you need?

H.
- --
Hendrik Maryns
http://tcl.sfs.uni-tuebingen.de/~hendrik/
==================
http://aouw.org
Ask smart questions, get good answers:
http://www.catb.org/~esr/faqs/smart-questions.html

Reply to this Message

immutable object that holds Objects

Free Magazines