| Author |
Message
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| fde |
 Posted: Thu Jun 04, 2009 3:20 am Post subject: Mapping empty simple objects |
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Acolyte
Joined: 05 Jul 2007
Posts: 65
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I am using the mapping node in Broker 6.1 to map an object within the xmlnsc domain.
Empty elements are not mapped currently.
I am receiving:
<data>
<stringField1></stringField1>
<stringField2>HelloWorld</stringField2>
</data>
The mapping node connects stringField1 with stringField1 of the target MessageSet. But the empty field is not mapped.
<data>
<stringField2>HelloWorld</stringField2>
</data>
The missing field stringField1 is defined as mandatory in the MessageSet, so now the message is no longer valid. I saw some custom solutions with esql code as a mapping directive but this scenario could happen for a lot more fields, so custom processing is not a good option.
I tested some configurations with global "xml representation of null values" with "Null value" for non-numeric null values without success.
Any suggestion for mapping empty xml elements?
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| fjb_saper |
| Posted: Thu Jun 04, 2009 7:53 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20768
Location: LI,NY
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Have you tried using a value clause? 
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| AkankshA |
| Posted: Thu Jun 04, 2009 8:48 pm Post subject: |
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Grand Master
Joined: 12 Jan 2006
Posts: 1494
Location: Singapore
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from 6.1 Help
ESQL support for null values
Using ESQL, you can set the value of a message tree element to NULL:SET OutputRoot.XMLNSC.myField VALUE = NULL;
Note that this is quite different from SET OutputRoot.XMLNSC.myField = NULL; which would cause myField to be deleted from the message tree.
The same effect can be achieved using Java or a Mapping node.
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| kimbert |
| Posted: Fri Jun 05, 2009 1:15 am Post subject: |
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Jedi Council
Joined: 29 Jul 2003
Posts: 5543
Location: Southampton
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| fde |
| Posted: Fri Jun 05, 2009 3:45 am Post subject: |
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Acolyte
Joined: 05 Jul 2007
Posts: 65
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Thank you. I implemented a 'per field' solution in an esql node:
| Code: |
SET OutputRoot = InputRoot;
SET OutputLocalEnvironment = InputLocalEnvironment;
IF InputRoot.MRM.StringField IS NULL
THEN
SET OutputRoot.MRM.StringField = '';
END IF;
RETURN TRUE;
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This is working for the implemented field. Although I think, that the mapping node should be able to do the same.
There is a difference between an element being null and an element having a value of null. Imo the mapping node should care for that difference.
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Global warming is an unintentional side effect of SOA's hotness.
-- http://soafacts.com/
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| kimbert |
| Posted: Fri Jun 05, 2009 4:02 am Post subject: |
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Jedi Council
Joined: 29 Jul 2003
Posts: 5543
Location: Southampton
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That sounds like the correct approach for now.
I've made the appropriate developer aware of this shortcoming in the Mapping node. |
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| fde |
| Posted: Fri Jun 05, 2009 6:05 am Post subject: |
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Acolyte
Joined: 05 Jul 2007
Posts: 65
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Thank you for your patience, I had to discard my esql-node solution. I was not able to match the correct order of elements.
Instead I went to esql mapping directives. I enveloped each of those empty elements with an "if" mapping declaration with condition
| Code: |
esql:is-null($source/myElement)
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That worked very well. But it is still a solution for a particular element, not a whole message. I would have to envelope all elements with this structure.
I will set up a low priority pmr for this.
Thank you again.
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| fde |
| Posted: Fri Jun 05, 2009 6:12 am Post subject: |
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Acolyte
Joined: 05 Jul 2007
Posts: 65
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Yes, thanks, I found that initially, I got my esql-mapping-directive aproach from there. Compared to op, luckily I can set my simple types to '' in order to generade an empty element.
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