How to redirect the content of xsl:message element to a file?

[Bettina Reck <Be...@gmx.de>]

Hi all,

is there a possibility to redirect a text message from the element
xsl:message to a file instead of stderr? I validated an xml file against a
W3C Schema and afterwards – in order to do additional checking – against a
stylesheet. The validation errors from the Xerces parser are written to a
file (by use of a derived class of the DefaultHandler) and I would like to
append the error messages which I defined in the stylesheet between the
<xsl:message> tags to the already created file. 
Is there a class for Xalan to register with the XalanTransformer similar to
the behaviour of the DefaultHandler class?

I searched the docs and the archive for any examples but I still have no
clue how to start.

Any hints are appreciated!

Thanks,
Bettina

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Re: How to redirect the content of xsl:message element to a file?

[da...@us.ibm.com]

> Hi Dave,
> 
> thank you for your answer! In the meantime I tried both versions:
> XalanTranformer::setWarningStream() worked fine, but finally I will need 
a
> ProblemListener. Therefore I derived a class from the
> XalanTransformerProblemListener and reimplemented the problem() method – 
at
> least I tried to do so. To get information from the input parameter I
> searched for a while how to convert a XalanDOMString and a XalanDOMChar 
to a
> std::string. 
> Now there is another question:
> my application ends up in the catch block  I enclosed the 
transform()-method
> of the XalanTransformer in caused by an assignment from XalanDOMChar to
> XalanDOMString (as I found out):
> 
> XalanDOMString& dom_str_uri  =  dom_str_uri.assign(_uri); 

This code is puzzling.  Is dom_str_uri really a reference to itself?  Or 
is this a typo?

> 
> Where _uri is the input parameter from the problem() function of the 
derived
> ProblemListener class. But I simply have no clue why it does so. Do I 
use
> the wrong function?

You should set your debugger to stop when an exception is thrown, but I 
suspect either your code is broken, as I mentioned above, or the _uri 
parameter is null, and you are not checking for that before you call 
XalanDOMString::assign().

Dave

Re: How to redirect the content of xsl:message element to a file?

[Bettina Reck <Be...@gmx.de>]

Hi Dave,

thank you for your answer! In the meantime I tried both versions:
XalanTranformer::setWarningStream() worked fine, but finally I will need a
ProblemListener. Therefore I derived a class from the
XalanTransformerProblemListener and reimplemented the problem() method – at
least I tried to do so. To get information from the input parameter I
searched for a while how to convert a XalanDOMString and a XalanDOMChar to a
std::string. 
Now there is another question:
my application ends up in the catch block  I enclosed the transform()-method
of the XalanTransformer in caused by an assignment from XalanDOMChar to
XalanDOMString (as I found out):

XalanDOMString& dom_str_uri  =  dom_str_uri.assign(_uri);  

Where _uri is the input parameter from the problem() function of the derived
ProblemListener class. But I simply have no clue why it does so. Do I use
the wrong function?

Thanks again for any help!

Bettina


> > is there a possibility to redirect a text message
> > from the element xsl:message to a file instead of
> > stderr? I validated an xml file against a W3C Schema
> > and afterwards – in order to do additional checking
> > – against a stylesheet. The validation errors from
> > the Xerces parser are written to a file (by use of
> > a derived class of the DefaultHandler) and I would
> > like to append the error messages which I defined in
> > the stylesheet between the <xsl:message> tags to the
> > already created file. Is there a class for Xalan to
> > register with the XalanTransformer similar to the
> > behaviour of the DefaultHandler class?
> 
> If you set your own derivative of ProblemListener, using 
> XalanTransformer::setProblemListener(), you can re-direct messages, 
> warnings, and errors.  However, you will be responsible for the display of
> any diagnostic output if you do this.
> 
> If you just want simple re-direction of warnings and messages, you can set
> and instance of std::ostream, by calling 
> XalanTranformer::setWarningStream().  Again, this interrupts the normal 
> display of diagnostic output (except errors), so you will be responsible 
> for displaying messages or warnings.
> 
> Dave

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+++ Empfehlung der Redaktion +++ Internet Professionell 10/04 +++

Re: How to redirect the content of xsl:message element to a file?

[da...@us.ibm.com]

> is there a possibility to redirect a text message
> from the element xsl:message to a file instead of
> stderr? I validated an xml file against a W3C Schema
> and afterwards – in order to do additional checking
> – against a stylesheet. The validation errors from
> the Xerces parser are written to a file (by use of
> a derived class of the DefaultHandler) and I would
> like to append the error messages which I defined in
> the stylesheet between the <xsl:message> tags to the
> already created file. Is there a class for Xalan to
> register with the XalanTransformer similar to the
> behaviour of the DefaultHandler class?

If you set your own derivative of ProblemListener, using 
XalanTransformer::setProblemListener(), you can re-direct messages, 
warnings, and errors.  However, you will be responsible for the display of 
any diagnostic output if you do this.

If you just want simple re-direction of warnings and messages, you can set 
and instance of std::ostream, by calling 
XalanTranformer::setWarningStream().  Again, this interrupts the normal 
display of diagnostic output (except errors), so you will be responsible 
for displaying messages or warnings.

Dave