ReferenceInsertionEventHandler called "to often"/need more configuration
settings
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Key: VELOCITY-749
URL: https://issues.apache.org/jira/browse/VELOCITY-749
Project: Velocity
Issue Type: Bug
Affects Versions: 1.6.2
Reporter: Marco Rothe
Priority: Minor
Fix For: 1.6.x, 1.7
I use the EscapeXmlReference (ReferenceInsertionEventHandler implementation) in
our projects to produce valid XHTML.
But I works not as expected in some situations:
Given the reference $test as 'Me & Co. Ltd' (for example from context) will
output as
Me & Co. Ltd
correctly after the EscapeXmlReference.
But if we enrich the $test reference with some other string before output
(#set($test = "* $test *")) we got
* Me & Co. Ltd *
and not * Me & Co. Ltd * as output!
This is because the EscapeReference handler was called two times. First on the
(internal) set directive (Me & Co. Ltd -> Me & Co. Ltd), second on the real
output of $test to the stream (* Me & Co. Ltd *-> * Me & Co. Ltd
*).
The javadoc of ReferenceInsertionEventHandler says "Reference 'Stream
insertion' event handler. Called with object that will be inserted into
stream via value.toString()."
"inserted into stream" means to me into the real output stream of the
template merge, not into internal substreams. So I believe it's a bug or a
least an unexpected behaviour because it produce unpredictable results on
string operations.
So the ReferenceInsertionEventHandler needs the possibility to know if the
current insertation is an internal or an real output insertation to be able to
react on situations as descripted above.
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