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List:       jakarta-commons-dev
Subject:    Re: [configuration] Type conversion
From:       Oliver Heger <oliver.heger () oliver-heger ! de>
Date:       2008-02-29 20:06:03
Message-ID: 47C865AB.9090804 () oliver-heger ! de
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Emmanuel Bourg schrieb:
> Hi,
> 
> I've been working on the type conversion lately, it's almost complete, I 
> still have to refactor the unit tests and write the docs. Here is what I 
> plan to commit:
> 
> - A new Converter interface is introduced in the o.a.c.c.converter 
> package. This interface has a single method designed to convert a value 
> into any other type:
> 
> public interface Converter
> {
>     <T> T convert(Class<T> cls, Object value, Object... params) throws 
> ConversionException;
> }
> 
> 
> - the DefaultConverter class in the same package provides a default 
> implementation of this interface.
> 
> - AbstractConfiguration has a new instance field with get/setters to 
> specify the converter to be used. DefaultConverter is used by default. 
> Another implementation using BeanUtils or Morph can be used instead (I 
> implemented a converter based on BeanUtils as an example but it supports 
> only the String->Object conversion).
> 
> - internally, DefaultConverter uses a set of package private type 
> converters to handle the conversion into a specific type 
> (LocaleConverter, DateConverter, etc). The TypeConverter interface looks 
> like this :
> 
> 
> interface TypeConverter<T>
> {
>     T convert(Object value, Object... params) throws ConversionException;
> }
> 
> - the to<Type>() methods in PropertyConverter are removed. I suggest 
> renaming the class to PropertyUtils to avoid any confusion with the 
> converters.
> 
> What do you think?
> 
> Emmanuel Bourg
> 
> 
This looks pretty good to me. Just a question about the convert() 
methods: What is the meaning of the params var arg parameter and where 
do the actual values come from?

Oliver

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