[Jboss-dev-forums] [Design of JBoss ESB] - Re: Looking for a real life ESB transformation example

[tfennelly <do-...@jb...>]

OK, so I've put something together on this.

So the solution I implemented revolves around a standard SAX Parser implementation called X12nToSaxEventParser.  As its name is supposed to suggest, it parses an X12N stream and generates a set of SAX Events which it fires at a standard SAX ContentHandler implementation.  It has 2 support class: 
1. X12nStreamReader: Wraps the stream and makes the X12N segments easier to access.
2. X12nModel: Contains definitions to help the parser convert the X12N stream to a stream of SAX events.

Here's a sample of its output after parsing the sample X12N stream in Dave's above post - actually it's 2 blocks of the above sample X12N, hence the 2  blocks inside the root <x12n> element.

So, this parser could be used by any XML transformation tools that support SAX based processing and transformation.  I had to make a very small mod to Smooks in order to make it easier to specify specific SAX parsers for specific message types - available in the v 0.7.2-SNAPSHOT build from the downloads.

See the JUnit test code.  The x12n-config.cdrl config file illustrates how to configure the X12nToSaxEventParser to parse messages originating from X12N based message producers ("x12n-requester" - "x12n-producer" might have been a better profile name).  See X12nToSaxEventParserTest for the units test code for executing a parse.  Excuse the fact that this test has no assertions - it just runs the parse :-)  This test doesn't perform any actual XML based transformations on the XMLified X12N stream.  This would probably be required in a real life situation (different transformations for different consumers) and is easy enough using the standard Smooks mechanisms (see tutorials) - once we have it in XML, we can do whatever we want!!

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