[relaxng-user] Java datatype library: value object->string conversion

[Kohsuke Kawaguchi]

Julian Scheid wrote:
> Kohsuke Kawaguchi wrote:
>> And even if you fix that, it's still not enough for code generators. 
>> They have to know how to create an instance of QName, not a string 
>> representation. You'd like to be able to generate something like:
>> 
>>     public static final QName ABC = new QName("foo","bar");
> 
> Actually I don't need this, I'd just like to generate:
> 
>       Datatype qnameDatatype = ...;
>       QName abc = (QName)qnameDatatype.createValue(literal, context);
> 
> where 'literal' is some value read from an XML stream.
> 
> I assume that's because I'm ok with the generated code depending on the 
> datatype library.

Oh, OK. But if you are doing this, can't you just remember what literal 
you passed in to Datatype.createValue, along with the context that you 
passed in?  You can also use .getClass() to find out what the type of 
the value is for that particular literal.

> I agree that when it comes to transforming to literals the issue is 
> somewhat more complex than I indicated. But isn't what's needed 
> basically a registerNamespace(String uri, String prefix) method in the 
> context?

No. My point was that generating code like the following is a lot more work:

     public static final QName ABC = new QName("foo","bar");

It's clearly not just an issue of declaring a new namespace.


-- 
Kohsuke Kawaguchi
Sun Microsystems                   kohsuke.kawaguchi at sun.com