Re: [morph-developer] Imprecise converters

[Matt S. <Mat...@wh...>]

Yikes, that doesn't sound good.  I'm wondering if it would be possible to
fix this as an implementation concern rather than introducing a new
interface.  Perhaps the ordering of the source and destination classes could
be used by the ChainedTransformer to give an indication of preference for
the conversion path chosen.

Can you give me a concrete example where data is lost?  I would be very
interested in setting up a test case that demonstrates the problem and also
a solution for the problem.  This is the type of problem with Morph that I
have a lot of fun with ;)

Matt S

On Jan 3, 2008 5:27 PM, Matt Benson <gud...@ya...> wrote:

> In using ChainedTransformer I find I have to jump
> through hoops at times to pick the proper
> transformation path, particularly with the
> TextConverter.  If it happens to pick char, Character,
> or null as a conversion step between e.g. a "to-text"
> converter and a "from-text" converter, data is lost.
> I am thinking of an interface like this:
>
> public interface ImpreciseConverter extends Converter
> {
>    boolean isImpreciseConversion(Class
> destinationClass, Class sourceClass);
> }
>
> The default implementation on BaseTransformer:
>
> public boolean isImpreciseConversion(Class
> destinationClass, Class sourceClass) {
>    return destinationClass == null && sourceClass !=
> null;
> }
>
> TextConverter would report that a conversion from a
> string to null or char is imprecise.
> ChainedTransformer could then be coded to avoid
> imprecise conversions when possible.
>
> WDYT?
>
> -Matt B
>
>
>
>
>
>
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