JEXL built-in Data() function cannot return a reference to a whole <data>
element
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Key: SCXML-69
URL: https://issues.apache.org/jira/browse/SCXML-69
Project: Commons SCXML
Issue Type: Improvement
Affects Versions: 0.6, 0.5, 0.7, 0.8, 1.0
Reporter: Javier Arauz
Priority: Minor
Fix For: 0.8
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'"/>
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