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| wyatt |
 Posted: Thu Nov 09, 2006 1:12 pm Post subject: Accessing the MQRFH2 header using a JavaCompute node |
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Joined: 28 Nov 2004
Posts: 76
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Does anyone have an example of accessing user defined data in the MQRFH2 header?
The evaluateXPath() method defined in MbMessage and MbElement return data in the Message Body only.
Thx |
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| jefflowrey |
| Posted: Thu Nov 09, 2006 1:28 pm Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
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| wyatt |
| Posted: Thu Nov 09, 2006 1:59 pm Post subject: |
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Joined: 28 Nov 2004
Posts: 76
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| I looked at the example in the suplied link(before posting), this link focuses is on the creation of an RFH2 header. We are trying to access an existing RFH2 header within java compute node, specifically user defined tags. |
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| jefflowrey |
| Posted: Thu Nov 09, 2006 2:16 pm Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
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If you look at the syntax of the XPath statement at the end of that section, it will show you (somewhat, there are some jsp formatting errors) how to write the XPath you want. Based on my reading, I would expect something like "/MQHRF2/usr/<property name>".
Otherwise, you can use the getFirstChild and getNextSibling methods on MbElement to work your way down from the Root to find the element named MQRFH2, and work your way down from there to the fields you want.
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| wyatt |
| Posted: Thu Nov 09, 2006 3:03 pm Post subject: |
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Joined: 28 Nov 2004
Posts: 76
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Hmm, Im missing something
| Quote: |
| Otherwise, you can use the getFirstChild and getNextSibling methods on MbElement to work your way down from the Root to find the element named MQRFH2, and work your way down from there to the fields you want. |
The following code accesss the MQRFH2 folder but always returns empty list regardless of what is placed in the evaluateXPath method
MbElement inRoot = contact admin.getMessage().getRootElement();
MbElement inRFH2Doc = inRoot.getFirstChild().getNextSibling().getNextSibling();
java.util.List inRFH2 = (java.util.List) inRFH2Doc.evaluateXPath("/MQRFH2");
inRFH2.size();
When evaluateXPath is invoked from MbMessage, it finds XML tags in the message body but not anything that in the MQRFH2 folder
MbMessage msg = assembly.getMessage();
List chapters= (List)msg.evaluateXPath("/MQRFH2");
MbElement chapter = (MbElement)chapters.get(0);
The MbMessage java doc says MbMessage.evaluateXPath() "Evaluates the XPath 1.0 expression with the message body (last child of root) as the context node." Is MQRFH2 part of the message body within Java compute node? |
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| wyatt |
| Posted: Thu Nov 09, 2006 3:25 pm Post subject: |
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Voyager
Joined: 28 Nov 2004
Posts: 76
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ha, this works also but I dont think it will pass a code review:
MbElement inRFH2Doc = inRoot.getFirstChild().getNextSibling().getNextSibling().getFirstChild().getNextSibling().getNextSibling().getNextSibling().getNextSibling().getNextSibling().getNextSibling().getNextSibling().getNextSibling().getNextSibling().getNextSibling().getNextSibling().getNextSibling().getFirstChild(); |
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| jefflowrey |
| Posted: Thu Nov 09, 2006 3:28 pm Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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MQRFH2 is going to be a Previous Sibling of the Message Body.
It's probably going to be the Next Sibling of MQMD.
Looking for /MQRFH2 after already moving to the second sibling of root doesn't make much sense.
Go back and look at the example in the documentation link again!
Ignore every statement that includes "create".
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| wyatt |
| Posted: Thu Nov 09, 2006 3:43 pm Post subject: |
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Joined: 28 Nov 2004
Posts: 76
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| Quote: |
| Looking for /MQRFH2 after already moving to the second sibling of root doesn't make much sense. |
Root->Properties->MQMD->MQRFH2
....getFirstChild(().getNextSibling().getNextSibling();
This takes you to the RFH2 folder
But as mentioned, evaluateXPath returns an empty list. Of course I can chain getNextSibling() methods
What else am I missing |
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| wyatt |
| Posted: Thu Nov 09, 2006 4:08 pm Post subject: |
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Voyager
Joined: 28 Nov 2004
Posts: 76
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For the benefit of others, this will retrieve data from RFH2 folder
MbElement root = inMessage.getRootElement();
MbXPath xp = new MbXPath("/MQRFH2/usr/sometag", root);
List rfh2list = (List)root.evaluateXPath(xp);
rfh2list.size();
MbElement rfh2elem = (MbElement) rfh2list.get(0);
rfh2elem.getName();
rfh2elem.getValue();
Thx, you were correct! |
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