Groovy XmlSlurper: Find attribute name by attribute value in XML

Question

How can I find an attribute name in XML structure by attribute value using Groovy XmlSlurper/XmlParser. Let's say we have XML:

<root>
    <item id="Correction">
        <desc value_err="Error_3"></desc>
    </item>
    <item id_err="Error_2">
        <desc />
    </item>
</root>

I need to find attribute name by value (Initial task: find list of nodes where attribute value like 'Error_'). e.g "Error_2" -> id_err and "Error_3" -> value_err

The only solution I found iteration through all Node attributes map. Is there any GPath for it?

Small remark: we're not able to change structure of XML. This is external exception API.

Answer 1

You can just do a depth-first search of the XML tree:

def xmlString = '''<root>
    <item id="Correction">
        <desc value_err="Error_3"></desc>
    </item>
    <item id_err="Error_2">
        <desc />
    </item>
</root>'''

import groovy.xml.*

def xml = new XmlSlurper().parseText(xmlString)

def nodes = xml.'**'.findAll { node ->
    node.attributes().find { it.value.startsWith 'Error_' }
}