Hi Roland,
Roland Roberts wrote:
> DefaultConverterLookup method lookupConverterForType(Class type) throws
> a runtime exception. This was totally unexpected since I don't see it in
> the docs. How exactly is one supposed to /safely/ look up converters?
>
> Why do I need to do this you ask....
>
> I have a map from name to object. Before calling toString() on the
> object, I want to see if there is a converter for the object's class and
> if so, call it. And yes, there is a reason for using that type of map
> which is what has evolved (or maybe devolved) after several rounds of
> factoring in the code.
The idea is, that a ConverterLookup actually *can* handle all types.
Therefore XStream registers normally a ReflectionConverter with lowest
priority that acts as catch all.
In your case you will have to register an equivalent for null i.e.:
class NoConverter implements Converter {
static Converter INSTANCE = new NoConverter();
boolean canConvert(Class type) {
return true;
}
void marshal(...) {
throw new ConverterException();
}
Object unmarshal(...) {
throw new ConverterException();
}
}
lookup.registerConverter(NoConverter.INSTANCE, Integer.MAX_VALUE);
Converter converter = lookup.lookupConverterForType(Void.class);
if (converter != NoConverter.INSTANCE) {
// ...
}
- Jörg
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