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Subject: RE: [Digester] How to specify a <call-param-rule> parameter from
	top-of-stack
From: Simon Kitching <simon@ecnetwork.co.nz>
To: Jakarta Commons Users List <commons-user@jakarta.apache.org>
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Date: 28 Jan 2003 10:59:07 +1300
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Hi Naresh,

Isn't the "SetTopRule" what you want?

class Product
{
  .....

  public void addToParent(HashMap parent)
  {
    parent.put(this.partNumber, this);
  }
}

digester.addSetTop("/products/product", "addToParent",
"java.util.HashMap");

I presume the same functionality is available via the xml config..

Regards,

Simon


On Sat, 2003-01-25 at 07:07, Naresh Bhatia wrote:
> Yep, I found it in the latest nightly build.
> Naresh
> 
> -----Original Message-----
> From: Baltz, Kenneth [mailto:Kbaltz@firstam.com] 
> Sent: Friday, January 24, 2003 1:00 PM
> To: Jakarta Commons Users List
> Subject: RE: [Digester] How to specify a <call-param-rule> parameter
> from top-of-stack
> 
> 
> Looks like that's a new feature, "fromStack".  I don't see it in the 1.3
> Javadoc.  Perhaps it will come to the XML soon.  I'm surprised a
> developer hasn't chimed in yet.
> 
> K.C.
> 
> > -----Original Message-----
> > From: Naresh Bhatia [mailto:NBhatia@sapient.com]
> > Sent: Friday, January 24, 2003 9:25 AM
> > To: Jakarta Commons Users List
> > Subject: RE: [Digester] How to specify a <call-param-rule> parameter 
> > from top-of-stack
> > 
> > 
> > Yep, that would work - neat trick! Although, I agree with you that the
> 
> > ability to address the object on the stack as an argument would be 
> > nicer. I thought that this could be done programatically using 
> > Digester.addCallParam(java.lang.String pattern, int paramIndex, 
> > boolean
> > fromStack) - just that I could not find a way to do this via XML.
> > 
> > Thanks again.
> > Naresh
> > 
> > -----Original Message-----
> > From: Baltz, Kenneth [mailto:Kbaltz@firstam.com]
> > Sent: Friday, January 24, 2003 11:51 AM
> > To: Jakarta Commons Users List
> > Subject: RE: [Digester] How to specify a <call-param-rule> parameter
> > from top-of-stack
> > 
> > 
> > Here's the solution I was given.  I think it would be easier
> > if we could
> > reference the item on the stack as an argument.
> > 
> > The trick is to create a new object that takes care of populating the 
> > HashMap for you.
> > 
> > E.g.
> > 
> > // Has to be public, although an anonymous inner class would be great 
> > public class HashMapProxy {
> > 	HashMap _map;
> > 	public Hashmap Proxy() {
> > 		_map = new HashMap();
> > 	}
> > 
> > 	public void addProduct( Product p ) {
> > 		_map.put( p.getPartNumber(), p );
> > 	}
> > 
> > 	public HashMap getMap() {
> > 		return _map;
> > 	}
> > }
> > 
> > Use the following Digester code:
> > 
> > 
> >     digester.addObjectCreate( "products", HashMapProxy.class );
> >     digester.addObjectCreate( "products/product", Product.class );
> > 	... initialize your Product object
> >     digester.addSetNext( "products/product", "addProduct" );
> > 
> >     HashMapProxy proxy = (HashMapProxy)digester.parse( XML );
> > 
> >     return proxy.getMap();
> > 
> > 
> > Hope that helps, hope they find a better way.
> > 
> > K.C.
> > 
> > > -----Original Message-----
> > > From: Naresh Bhatia [mailto:NBhatia@sapient.com]
> > > Sent: Thursday, January 23, 2003 9:44 PM
> > > To: commons-user@jakarta.apache.org
> > > Subject: [Digester] How to specify a <call-param-rule>
> > parameter from
> > > top-of-stack
> > > 
> > > 
> > > I am trying to parse an XML file similar to the one shown below:
> > > 
> > > <products>
> > >   <product partNumber="1000">
> > >       ...
> > >   </product>
> > >   <product partNumber="2000">
> > >       ...
> > >   </product>
> > > </products>
> > > 
> > > I want Digester to return a HashMap with partNumber as the key and
> > > product as the value. How do I put the product on to the HashMap? I 
> > > guess I don't know how <call-param-rule> can specify the 
> > object from
> > > top of the stack as a parameter. Here's my unsuccessful attempt at
> > > this:
> > > 
> > > <digester-rules>
> > >   <object-create-rule pattern="products" 
> > > classname="java.util.HashMap"/>
> > > 
> > >   <pattern value="products/product">
> > >     <object-create-rule classname="Product"/>
> > > 
> > >     <set-properties-rule>
> > >       <alias attr-name="partNumber" prop-name="partNumber"/>
> > >     </set-properties-rule>
> > > 
> > >     <call-method-rule methodname="put" paramcount="2"
> > >       paramTypes="java.lang.String,Product"/>
> > >     <call-param-rule paramnumber="0" attrname="partNumber"/>
> > >     <call-param-rule paramnumber="1"/>  <--- what to do here?
> > >   </pattern>
> > > 
> > > </digester-rules>
> > > 
> > > Thanks.
> > > Naresh Bhatia
> > > 
> > 
> > --
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