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Posted to users@cocoon.apache.org by a0...@gmx.net on 2002/04/10 09:41:29 UTC
how to marshal objects within xsp
Whats the best way to perform marshalling from Objects to XML within XSP's?
The Object is a result from a Castor OQL-Query.
Here's an example what I'd like to intend:
<some-items anAttr="aVal">
<xsp:logic>
marshalObjToXml(model.getAnItem());
</xsp:logic>
</some-items>
I've experimented in vain with the following approaches:
1. Include Object as String:
<xsp:page
language="java"
xmlns:xsp="http://apache.org/xsp"
xmlns:cinclude="http://apache.org/cocoon/include/1.0"
xmlns:util="http://apache.org/xsp/util/2.0"
>
<some-items anAttr="aVal">
<util:include-expr>
<xsp:expr>model.getAnItemAsString()</xsp:expr>
</util:include-expr>
</some-items>
</some-items>
</xsp:page>
The page does not compile. The method .getAnItemAsString is not even
executed.
2.
Use Castor's marshalling capabilities:
<some-items anAttr="aVal">
<xsp:logic>
model.marshal(this.contentHandler);
</xsp:logic>
</some-items>
Within the method I pass the contentHandler (wrapped into
DocumentHandlerAdapter) to castor's marshaller before I perfom mashal(obj).
As A result the cinclude transformer (which I need) complains about a
Nullpointer exception.
Does anyone have a better Idea? Examples are welcome.
Harald
--
GMX - Die Kommunikationsplattform im Internet.
http://www.gmx.net
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RE: how to marshal objects within xsp
Posted by Vadim Gritsenko <va...@verizon.net>.
> From: a000@gmx.net [mailto:a000@gmx.net]
>
> Whats the best way to perform marshalling from Objects to XML within
XSP's?
Take a look at the XMLizable interface. These objects could be included
as easy as (IIRC):
<xsp:expr>myXMLizable</xsp:expr>
> The Object is a result from a Castor OQL-Query.
> Here's an example what I'd like to intend:
>
>
> <some-items anAttr="aVal">
> <xsp:logic>
> marshalObjToXml(model.getAnItem());
> </xsp:logic>
> </some-items>
>
> I've experimented in vain with the following approaches:
>
> 1. Include Object as String:
>
>
> <xsp:page
> language="java"
> xmlns:xsp="http://apache.org/xsp"
> xmlns:cinclude="http://apache.org/cocoon/include/1.0"
> xmlns:util="http://apache.org/xsp/util/2.0"
> >
> <some-items anAttr="aVal">
> <util:include-expr>
>
<xsp:expr>model.getAnItemAsString()</xsp:expr>
> </util:include-expr>
> </some-items>
> </some-items>
> </xsp:page>
>
> The page does not compile. The method .getAnItemAsString is not even
> executed.
This will compile if you put everything on one line, no text nodes in
the util:include-expr element:
<util:include-expr><xsp:expr>model.getAnItemAsString()</xsp:expr></util:
include-expr>
Also, I would not recommend you this anyway because of re-parsing
performance penalty.
> 2.
> Use Castor's marshalling capabilities:
>
> <some-items anAttr="aVal">
> <xsp:logic>
> model.marshal(this.contentHandler);
> </xsp:logic>
> </some-items>
This sounds perfect.
> Within the method I pass the contentHandler (wrapped into
> DocumentHandlerAdapter) to castor's marshaller before I perfom
mashal(obj).
>
> As A result the cinclude transformer (which I need) complains about a
> Nullpointer exception.
Make sure that model.marshal() does not call startDocument() and
endDocument() on the contentHandler. If it does, you should strip these
calls by wrapping contentHandler into the IncludeXMLConsumer.
This should work. Or we have a bug.
Vadim
>
> Does anyone have a better Idea? Examples are welcome.
>
> Harald
>
> --
> GMX - Die Kommunikationsplattform im Internet.
> http://www.gmx.net
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