Re: [xmlvm-dev] java.util.HashMap

[Arno P. <ar...@pu...>]

this is one of those reasons we are moving to the C backend. Mapping the 
Java object model to the Objective-C object model causes these kinds of 
problems.

Can you please generate a patch and submit to the review system? As long 
as we haven't switched to the C backend we're willing to look at 
Objective-C patches. (you have a CLA on file, right?)

Arno


On 3/18/11 8:43 AM, Troy Gaines wrote:
> Hello everyone,
>
> It seems like the java.util.HashMap might be implemented incorrectly.
>   Either that, or I'm not seeing something.  Below is the
> implementation.  I had some code that was cross-compiled over which had
> the equals method and hashCode method implemented correctly.
>
> During the program run, it could not find User instances in the map.
>   What I discovered is this was only a problem when the User instances
> were separate references even though the equals method and hashCode was
> correct.
>
> I'm thinking the [NSValue valueWithPointer:key] compares references and
> not the underlying values (in this case User).  Has anyone seen this
> same issue?  This may not even be a problem in the new C back-end, but
> I'm curious what you guys think.  The only solution I could come up with
> is to wrap the key in something else and forward the isEqual and hash
> methods.
>
> - (java_lang_Object*)
> put___java_lang_Object_java_lang_Object:(java_lang_Object*) key:
> (java_lang_Object*) value {
> java_lang_Object* oldObj = [self get___java_lang_Object:key];
> id k = [key conformsToProtocol: @protocol(NSCopying)] ? key : [NSValue
> valueWithPointer: key];
> [self setObject:value forKey:k];
> return oldObj;
> }
>
> Thanks again for all the great work!
>
>
>
>
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