Re: [Simple-support] how to write a transformer

[Александр (R. Щ. <ir...@gm...>]

just implement Matcher and Transformer and pass the first as an argument to
Persister constructior.

Here is my implementation for enums (sometimes i gotta deal with them in
non-standart way):

public class EnumMatcher implements Matcher {
     public Transform match(Class aClass) throws Exception {
        if (aClass.equals(Protocol.class)) {
            logger.debug("Matched :" + aClass.getName());
            return new EnumTransform(aClass);
        } else {
            return null;
        }
    }
}

public class EnumTransform implements Transform {

    private Class clazz;

    public EnumTransform(Class clazz) {
        this.clazz = clazz;
    }

    public Object read(String s) throws Exception {
        if (clazz.equals(Protocol.class)) {
            return Protocol.parseString(s);
        } else throw new InternalException("Invalid transform match");
    }

    public String write(Object o) throws Exception {
        if (clazz.equals(Protocol.class)) {
            return ((Protocol) o).protocol();
        } else throw new InternalException("Invalid transform match");
    }
}

in this example Protocol is a Enum with static method parseString(String).


2011/4/8 Niall Gallagher <gal...@ya...>

> You need to write a Matcher object to return the Matcher for the specified
> type. If you look in the test cases there is actually a Transformer for UUID
> in there somewhere.
>
> --- On *Thu, 7/4/11, jo desmet <jd...@gm...>* wrote:
>
>
> From: jo desmet <jd...@gm...>
> Subject: [Simple-support] how to write a transformer
> To: sim...@li...
> Received: Thursday, 7 April, 2011, 8:44 AM
>
> Hi,
>
> I need to serialize some object tree but it contains UUID's
>
> so when serializing I get the error
>
> Exception in thread "main"
> org.simpleframework.xml.transform.TransformException: Transform of class
> java.util.UUID not supported
>
>
> It is easy to write a transformer for this but how can I add this to the
> persister ?
>
>
>
> Jo
>
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> smartphone on the nation's most reliable network.
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-- 
Sincerely Yours
Alexander Shchegolev