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From "Andreas Veithen (JIRA)" <>
Subject [jira] Created: (WSCOMMONS-487) DataHandler extension should support deferred loading/parsing
Date Mon, 06 Jul 2009 20:33:14 GMT
DataHandler extension should support deferred loading/parsing

                 Key: WSCOMMONS-487
             Project: WS-Commons
          Issue Type: Improvement
          Components: AXIOM
    Affects Versions: Axiom 1.2.8
            Reporter: Andreas Veithen
            Assignee: Andreas Veithen

The XMLStreamReader extension defined by the IS_DATA_HANDLERS_AWARE, IS_BINARY and DATA_HANDLER
properties (see OMConstants) currently only allows immediate loading of the DataHandler. This
extension could be leveraged in a wider range of use cases if it also allowed deferred loading
of the DataHandler: in this case the consumer of the XMLStreamReader would get a reference/link
to the binary data but would fetch the DataHandler only when required (as Axiom does when
processing an MTOM/XOP message).

This improvement could be implemented by defining a set of additional properties, but a purely
property based solution is not very usable, difficult to document and also not very efficient.
The proposal is therefore to define an extension interface (with methods isBinary(), isDeferred(),
getDataHandler(), etc.) as well as a single property that allows the consumer of the XMLStreamReader
to query that extension interface. Of course care would be taken to maintain compatibility
with the existing DataHandler extension.

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