Add more servicability to OMStaxWrapper
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Key: WSCOMMONS-370
URL: https://issues.apache.org/jira/browse/WSCOMMONS-370
Project: WS-Commons
Issue Type: Improvement
Components: AXIOM
Reporter: Rich Scheuerle
Assignee: Rich Scheuerle
Background:
Axiom exposes an XMLStreamReader interface. The implementation of this
interface is the OMStAXWrapper object.
The OMStAXWrapper simulates the XMLStreamReader event model by a combination
of walking the om, walking OMDataSource objects, and getting events from the
original parser. There are a number of things that can go wrong. Sometimes
the problems are outside of Axiom (ie. invalid parser or incorrectly coded
OMDataSource implementation).
Problem:
When problems arise due to bad events from OMStAXWrapper, the problems may
not be detected until much further downstream. This can make it difficult to
determine the root cause of certain kinds of problems. (Example WSCOMMONS-369).
Solution:
I am working on a simple OMXMLStreamReaderValidator. When debug is enabled,
the validator wraps the OMStAXWrapper and can be used to validate the events.
The first generation of the validator will simply ensure that the START_ELEMENT
events have a matching END_ELEMENT event.
If the validator discovers a problem, it logs the assertion failures. This new
debug information will make it easier to track down the root cause.
The validator will only be inserted if tracing is enabled. Thus it will not
affect the performance of axiom.
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