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List:       jakarta-commons-dev
Subject:    RE: [digester] minor patches for using a Digester as a ContentHandler...
From:       "Scott Sanders" <ssanders () nextance ! com>
Date:       2002-07-31 17:15:03
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Excellent work, James.  I like it a lot.

FYI, I have just recently being working on SAX-based 'substreams', and
this will allow Digester to fit right in.

Scott

> -----Original Message-----
> From: James Strachan [mailto:james_strachan@yahoo.co.uk] 
> Sent: Wednesday, July 31, 2002 4:05 AM
> To: Jakarta Commons Developers
> Subject: [digester] minor patches for using a Digester as a 
> ContentHandler...
> 
> 
> I've been working on a Betwixt library for Jelly, so that in 
> Jelly we can do things like...
> 
> <betwixt:parse var="mybean" rootClass="com.acme.Foo">
>   <Foo id="123" name="cheese">
>     <Bar>abc</Bar>
>     <Bar>xyz</Bar>
>   </Foo>
> </betwixt:parse>
> 
> <j:forEach items="${mybean.bars}">
>     ...
> 
> Or a URI can be specified like this...
> 
> <betwixt:parse var="mybean" rootClass="com.acme.Foo" uri="foo.xml"/>
> 
> 
> In the first case, I need to be able to use Betwixt's 
> BeanReader, which is-a Digester in a new way that I'm not 
> sure folks have done before.
> 
> Digester implements the SAX ContentHandler interface, so you 
> can just stream SAX events into digester rather than calling 
> the one of the parse() methods. So in the first example, the 
> <betwixt:parse> tag will fire all the SAX events of its body 
> (the <Foo> and <Bar> elements) directly into the digester 
> rather than calling a parse() method.
> 
> I've made 2 minor patches to Digester so that it can be used 
> properly as a SAX ContentHandler, rather than via the parse() 
> methods...
> 
> * ensured that configure() is called in the startDocument() 
> to ensure that digester rules are properly configured before 
> any XML events are consumed.
> 
> * added a getRoot() property, so that after the SAX events 
> have been fired into the digester, the calling code can 
> extract the root object.
> 
> So now folks should be able to use the digester (if they 
> wish) like this...
> 
>     Digester digester = new MyDigester();
> 
>     // fire SAX events into the digester.
>     digester.startDocument();
>     ...
>     digester.endDocument();
> 
>     // now retrieve the object that digester parsed
>     Object object = digester.getRoot();
> 
> James
> 
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