StAX Filter [ Data conversion, extraction, or do something between
XMLStreamReader and StAXBuilder]
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Key: WSCOMMONS-76
URL: http://issues.apache.org/jira/browse/WSCOMMONS-76
Project: WS-Commons
Issue Type: New Feature
Components: AXIOM
Environment: windows
Reporter: Takahide Nogayama
Attachments: patchAXIOM_to_moduleaxiom-apisrcmainjava.txt,
patchAXIS2_to_moduleskernelsrc.txt, StAX_filter_architecture.ppt
Filter is interface and extends XMLStreamReader. Filter wraps XMLStreamReader.
And XMLStreamReader of StAXBuilder is replaced by Filter.
In building phase, next() method must be invoked on each event. filter get
result of next() from XMLStreamReader, and do some process, then return the
result to StAXBuilder.
We can set Object on filter. Filter get some information from it and set result
on it to transfer the result.
We can set StAXBuilder on filter. Filter get OMDocument from the builder. If
filter want to know past information, the OMDocument has it.
If StAXBuilder has lastNode() method, Filter can make reference list to OMNode.
this is commneted in http://issues.apache.org/jira/browse/WSCOMMONS-75 .
Example1)
SOAP header has some child elements. and they has actor Attribute. it indicates
which intermediary should process the element.
ExtractMyActorSOAPHeaderFilter.java is implementation of Filter for this
example. The filter monitors locaName at first,
If START_ELEMENT whose actor does not equals myactor is found, The filter
invokes next() until the element's END_ELEMENT.
Thus, The soap header elements which has other's actor are not transfered to
StAXBuilder. We can ommit creating fruitness OM.
Example2)
If StAXBuilder has lastNode() method, Filter can make reference list. The list
has OMNode whose actor indicates myactor.
After building, If we want to access Security header elements which has
myactor, we can access the element directry by using the reference list.
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