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Date: Thu, 11 Jun 2009 06:41:07 -0700 (PDT)
From: "Bill Harts (JIRA)" <jira@apache.org>
To: dev@synapse.apache.org
Subject: [jira] Updated: (SYNAPSE-557) XPath doesn't return attribute value
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     [ https://issues.apache.org/jira/browse/SYNAPSE-557?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bill Harts updated SYNAPSE-557:
-------------------------------

    Attachment: changes.patch

Changes to SynapseXPath.java to fix the XPath attribute problem.  Needs to be applied to the codebase.

Bill


> XPath doesn't return attribute value
> ------------------------------------
>
>                 Key: SYNAPSE-557
>                 URL: https://issues.apache.org/jira/browse/SYNAPSE-557
>             Project: Synapse
>          Issue Type: Bug
>          Components: Core
>            Reporter: Bill Harts
>         Attachments: changes.patch
>
>
> Problem:
> An XPath expression in my synapse.xml configuration file is unable to retrieve an XML attribute from a message.  Example:
> <log level="custom">
>   <property name="sessID"  expression="//ns:LoginResponse/ns:LoginResponseData/@sessionID" xmlns:ns="http://www.test.com/ns" />
> </log>
> The message body is:
>  <soapenv:Body>
>   <ns:LoginResponse xmlns:ns="http://www.test.com/ns">
>    <ns:LoginResponseData sessionID="250446AD43C0EEF3ED2F3172F8FA0A3D" statusCode="0"/>
>   </ns:LoginResponse>
>  </soapenv:Body>
> In this case the log mediator always returns null for the sessID variable.
> Cause:
> After poking around in a bunch of modules I believe that these XPath expressions are being handled in module synapseXPath.java.  Specifically there is a call in stringValueOf(MessageContext synCtx) to BaseXPath.evaluate() which returns a List of element pointers retrieved by the XPath expression.  The function then correctly checks each element to to determine if it is of type OMTextImpl, OMElementImpl or OMDocumentImpl but when an attribute has been found evaluate() returns an attribute of type DocumentNavigator$OMAttributeEx.  It appears that there is no code in stringValueOf() to handle this type of pointer.
> Solution:
> I added the following code to synapseXpath.java::stringValueOf at line 206:
>                     ...
>                     } else if (o instanceof OMAttributeEx) {
>                         textValue.append( ((OMAttributeEx)o).getAttributeValue());
>                    }
>                    ...
> Also, since the type OMAttributeEx is an inner class of type DocumentNavigator I needed to add an import statement in SynapseXPath.java:
> import org.apache.axiom.om.xpath.DocumentNavigator.OMAttributeEx;
> Unfortunately, OMAtributeEx is defined as private to class DocumentNavigator so I had to declare class and constructor OMAttributeEx as public in the module DocumentNavigator.java in the Axiom project module axiom-api.jar.  

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