[
https://issues.apache.org/jira/browse/SCXML-69?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Rahul Akolkar resolved SCXML-69.
--------------------------------
Resolution: Won't Fix
I think this might require a different way of going about the snippet posted
above, but I believe we shouldn't be adding more Data() function variants.
Not sure what "bar" refers to in the line:
<data name="foo" expr="'bar'"/>
As general comments:
* <data> should contain XML nodes, which would happen here if "bar" pointed to
one
* For pieces of the data model that are not nodes, <cs:var> should be used
instead, where 'cs' is the Commons SCXML namespace
Separately, there is a way to obtain the root <data> element by using the
current context node '.' in the query string i.e. Data(foo, '.')
Its unclear how useful that operation is (given the best practice that <data>
should contain an XML "tree" rooted with an application-specific root element).
> JEXL built-in Data() function cannot return a reference to a whole <data>
> element
> ---------------------------------------------------------------------------------
>
> Key: SCXML-69
> URL: https://issues.apache.org/jira/browse/SCXML-69
> Project: Commons SCXML
> Issue Type: Improvement
> Affects Versions: 0.5, 0.6, 0.7
> Reporter: Javier Arauz
> Priority: Minor
> Original Estimate: 72h
> Remaining Estimate: 72h
>
> There is no way with JEXL of building a Data() expression that refers to a
> whole <data> element, only to one of its children.
> Using standard W3C SCXML it is possible to refer to a whole <data> element,
> e.g.:
> <data name="myFoo"><content>Hi there!</content></data>
> <data name="foo" expr="'bar'"/>
> <assign location="/foo" expr="/myFoo/content"/>
> In theory, after running the above SCXML the 'foo' data element changes from
> value 'bar' to 'Hi there!'.
> There is no equivalent to the above SCXML using JEXL, since no Data()
> expression yields the root <data> element. This has the side effect that data
> elements as 'foo' above are effectively constants, since once defined there's
> no way of changing them.
> The solution to this problem would consist of implementing a new method in
> class org.apache.commons.scxml.Builtin that takes just two arguments: the
> namespaces in use and the name of the <data> element, and returns an
> org.w3c.Node containing whatever that <data> element contains. Then you could
> write:
> <data name="myFoo"><content>Hi there!</content></data>
> <data name="foo" expr="'bar'"/>
> <assign location="Data(foo)" expr="Data(myFoo, 'content'"/>
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
