Re: [picocontainer-dev] ConfigParameterTestCase / ConfigParameter

Paul Hammant wrote:

[snip]

> I'd love to stop using the XSteam converters, and just use the miriad
> of built in converters in the JDK ...
> 
>      Currency.getInstance(paramValue)
>      Float.valueOf(paramValue)

Hmmm. Remember XStream's ToStringConverter that was contributed by you?
Since Pico is now Java 5 it should be quite easy to provide some generic
parameter factories (Pico only needs 'em oneway only). Some pseudo-code:

interface ParameterFactory<T> {
    bool provides(Class<U> type);
    T fromString(String s);
}

abstract class AbstractParameterFactory<T> implements PF<T> {
    bool provides(Class<U> type) {
        return T.class == U.class;
    }
}

class StringConstructorParameterFactory<T> extends APF<T> {
    T fromString(String s) {
        return new T(s);
    }
}

class NewInstanceParameterFactory<T> extends APF<T> {
    T fromString(String s) {
        return T.newInstance(s);
    }
}

class ValueOfParameterFactory<T> extends APF<T> {
    T fromString(String s) {
        return T.valueOf(s);
    }
}

class EnumParameterFactory<T> extends APF<T> {
    T fromString(String s) {
        return Enum.valueOf(T.class, s));
    }
}

...
 
> This would allow a massive simplification of the implementation, and
> meet the my need, Konstantin's original need, and the needs in the
> lastest thread.

The only missing part is now to have a factory for the
ParameterFactories ;-)
However, all that is necessary is a (enhanceable ?) list of class types for
each ParameterFactory.

WDYAT ?

- Jörg


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