[jira] [Updated] (CAMEL-5403) Type converter for NodeList with size 1 to Node

["Raul Kripalani (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CAMEL-5403?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Raul Kripalani updated CAMEL-5403:
----------------------------------

    Labels: type-converter xerces xpath  (was: )
    
> Type converter for NodeList with size 1 to Node
> -----------------------------------------------
>
>                 Key: CAMEL-5403
>                 URL: https://issues.apache.org/jira/browse/CAMEL-5403
>             Project: Camel
>          Issue Type: New Feature
>          Components: camel-core
>    Affects Versions: 2.8.0
>            Reporter: Raul Kripalani
>              Labels: type-converter, xerces, xpath
>
> In many cases, Xerces will return transformation results as a NodeList of size 1 even though the XPath evaluation only yields one element during runtime.
> {code}
> <transform>
>    <xpath>/child::node()[local-name() = 'ABC']</xpath>
> </transform>
> {code}
> (that XPath is capable of matching multiple elements - but let's assume only one is matched)
> When applying an XPath choice afterwards, it is easy to come across this error:
> {code}
> java.lang.ClassCastException: org.apache.xml.dtm.ref.DTMNodeList cannot be cast to org.w3c.dom.Node
> 	at org.apache.xpath.jaxp.XPathExpressionImpl.eval(XPathExpressionImpl.java:121)[:]
> 	at org.apache.xpath.jaxp.XPathExpressionImpl.eval(XPathExpressionImpl.java:99)[:]
> 	at org.apache.xpath.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.java:184)[:]
> 	at org.apache.camel.builder.xml.XPathBuilder.doInEvaluateAs(XPathBuilder.java:676)[88:org.apache.camel.camel-core:2.8.0.fuse-03-06]
> 	at org.apache.camel.builder.xml.XPathBuilder.evaluateAs(XPathBuilder.java:640)[88:org.apache.camel.camel-core:2.8.0.fuse-03-06]
> 	at org.apache.camel.builder.xml.XPathBuilder.matches(XPathBuilder.java:132)[88:org.apache.camel.camel-core:2.8.0.fuse-03-06]
> 	at org.apache.camel.processor.ChoiceProcessor.process(ChoiceProcessor.java:65)[88:org.apache.camel.camel-core:2.8.0.fuse-03-06]
> [...]
> {code}
> To make the out-of-the-box experience smoother, I propose adding a little type converter that converts from NodeList => Node when the size of the former is 1.

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