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https://issues.apache.org/jira/browse/OFBIZ-2397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12704851#action_12704851
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Scott Gray commented on OFBIZ-2397:
-----------------------------------
I was pleasantly surprised by how easy it was to write a new resolver it must
have taken about an hour or two to get from never having looked at how JUEL
works before to having a working POC.
Anyway if you're happy with the implementation let me know and I'll go ahead
and commit it. The main reason I posted it to jira was so that you could take
a look before it went in since you're our resident JUEL expert :-)
> Implement a custom JUEL resolver for performing XPath queries on DOM Nodes
> --------------------------------------------------------------------------
>
> Key: OFBIZ-2397
> URL: https://issues.apache.org/jira/browse/OFBIZ-2397
> Project: OFBiz
> Issue Type: New Feature
> Components: framework
> Affects Versions: SVN trunk
> Reporter: Scott Gray
> Assignee: Scott Gray
> Attachments: XPath.patch
>
>
> In order to make XML easy to read using simple methods I've implemented a
> custom JUEL ELResolver that handles string properties for objects
> implementing org.w3c.dom.Node and org.apache.xerces.dom.NodeImpl. It takes
> the String and compiles it into an XPathExpression which is then evaluated
> against the base Node. The JUEL evaluation returns either null, a single
> Node or a NodeList depending on the result of the XPath evaluation.
> Type conversion is handled using the set operation like so:
> {code}
> // Get the key attribute node from the first property element, note no type
> is specified so no conversion takes place
> <set field="attributeNode"
> from-field="document['resource/property[1]/@key']"/>
> // ObjectType.simpleTypeConvert calls getTextContent on the node, if the
> target type is anything other than a string it calls simpleTypeConvert again
> using the string
> // Get the value of the attribute key from the first property element
> <set field="attributeValue"
> from-field="document['resource/property[1]/@key']" type="String"/>
> // If the key value were an Integer you could do this, the conversion would
> be node.getTextContent -> String -> Integer
> <set field="attributeValue"
> from-field="document['resource/property[1]/@key']" type="Integer"/>
> {code}
> I've also added support for NodeList to the iterate tag so that you can do
> this:
> {code:xml}
> <iterate entry="node" list="parameters.document['resource/property']">
> <log level="always" message="Property Key: ${node['@key']}"/>
> <log level="always" message="First Value: ${node['value[1]']}"/>
> </iterate>
> {code}
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