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Java Compute Node accessing localenvironment values / XPath

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jholand

Posted: Mon Jun 08, 2009 8:27 am Post subject: Java Compute Node accessing localenvironment values / XPath

Newbie

Joined: 08 Jun 2009
Posts: 2

I am having troubles accessing the localenvironment values with a Java Compute node.
I have tried variations such as (example pruned to minimum):

public void evaluate(MbMessageAssembly contact admin) throws MbException {
try {
MbMessage localEnv = contact admin.getLocalEnvironment();
String fileName = "";
fileName = (String) localEnv.evaluateXPath("string(/localenvironment/file/@name");
fileName = (String) localEnv.evaluateXPath("string(/file/@name");
fileName = (String) localEnv.evaluateXPath("string(/file/name");
}
finally {}
}

but I never get anything more than NULL for fileName.

Has anyone ever accessed the vaulues in the localenvironment?
if so could you share a simply code example?

Many thanks.
John R. Holand

rekarm01

Posted: Tue Jun 09, 2009 12:45 am Post subject: Re: Java Compute Node accessing localenvironment values / XP

Grand Master

Joined: 25 Jun 2008
Posts: 1415

This looks like a question for the WMB forum.

jholand wrote:

I am having troubles accessing the LocalEnvironment values with a Java Compute node.
I have tried variations such as (example pruned to minimum):

Code:

public void evaluate(MbMessageAssembly contact admin) throws MbException {
try {
MbMessage localEnv = contact admin.getLocalEnvironment();
String fileName = "";
fileName = (String) localEnv.evaluateXPath("string(/localenvironment/file/@name");
fileName = (String) localEnv.evaluateXPath("string(/file/@name");
fileName = (String) localEnv.evaluateXPath("string(/file/name");
}
finally {}
}

but I never get anything more than NULL for fileName.

MbMessage.evaluateXPath() uses the last child of the message as the context node; that's typically more useful for the Root message (where the last child is the message body), rather than LocalEnvironment.

MbElement.evaluateXPath() may work better:

Code:

MbElement localEnv = contact admin.getLocalEnvironment().getRootElement();

Vitor

Posted: Tue Jun 09, 2009 1:16 am Post subject:

Grand High Poobah

Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA

Moved to more relevant section
_________________
Honesty is the best policy.
Insanity is the best defence.

jholand

Posted: Tue Jun 09, 2009 5:38 pm Post subject:

Newbie

Joined: 08 Jun 2009
Posts: 2

I was able to finally figure this out, so I thought I would post the solution.
Here is the very brief (and now simple) code snippet.

MbElement localEnv = contact admin.getLocalEnvironment().getRootElement();
String directory = localEnv.getFirstChild().getFirstChild().getValueAsString();
String fileName = localEnv.getFirstChild().getFirstChild().getNextSibling().getValueAsString();

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