problem with time conversion

> In my app I have a XSLT processor that prepares config XML for
> sql-processor. The stylesheet contains a piece of logic that converts
> the current datetime into miliseconds that passed since 1/1/1970. (I
> added the "line 181" text to tie this snippet with the error below):
>
>                                 <xsl:apply-templates><!-- convert
> current date into milliseconds -->
>                                     <xsl:with-param name="timestamp">
>                                         <!-- express duration between
> current date and jan 1 1970 in format PxxxDTxxxHxxxMxxxS -->
>                                         <xsl:variable name="dur">
>                                             <xsl:value-of
> select='xs:dateTime(current-dateTime()) -
> xs:dateTime("1970-01-01T00:00:00")'/>
>                                         </xsl:variable>
>                                         <!-- convert variable dur into
> miliseconds -->
>                                         <xsl:value-of
> select="1000*(60*(60*(24*xs:decimal(substring-before(substring-after($dur,
> 'P'), 'D')) +
>                                            
> xs:decimal(substring-before(substring-after($dur, 'T'), 'H'))) +
>                                            
> xs:decimal(substring-before(substring-after($dur, 'H'), 'M'))) +
> line 181                            
> xs:decimal(substring-before(substring-after($dur, 'M'), 'S')))"/>
>                                     </xsl:with-param>
>                                 </xsl:apply-templates>
>
>
> The code works most of the time, but every once a while OPS throws an
> exception like this:
>
> 2006-01-12 10:00:42,000 ERROR org.orbeon.oxf.pipeline.InitUtils null -
> Exception at oxf:/H3F/notice.xpl, line 181, column -1
> ; SystemID: oxf:/H3F/notice.xpl; Line#: 181; Column#: -1
> org.orbeon.saxon.xpath.DynamicError: Cannot convert string "" to decimal
>     at
> org.orbeon.saxon.expr.ComputedExpression.dynamicError(ComputedExpression.java:465)
>
>     at
> org.orbeon.saxon.expr.CastExpression.evaluateItem(CastExpression.java:106)
>     at
> org.orbeon.saxon.expr.ArithmeticExpression$NumericArithmetic.evaluateItem(ArithmeticExpression.java:386)
>
>     at
> org.orbeon.saxon.expr.ArithmeticExpression$NumericArithmetic.evaluateItem(ArithmeticExpression.java:386)
>
>     at
> org.orbeon.saxon.expr.ArithmeticExpression$NumericArithmetic.evaluateItem(ArithmeticExpression.java:376)
>
>     at
> org.orbeon.saxon.expr.ArithmeticExpression$NumericArithmetic.evaluateItem(ArithmeticExpression.java:386)
>
>     at
> org.orbeon.saxon.expr.ComputedExpression.iterate(ComputedExpression.java:408)
>
>
> Given that all input into this function is always present (right?) I
> have no clue what could ba causing this problem. Optionally, if there is
> a better method to generate this "miliseconds" string please let me know.
>
> Alex.

> Alex,
>
> I would think that the error is not random, but due to incorrect input  
> data, because of what the error indicates. You may want to add types  
> to your XSLT variables (as="xs:integer", for example), which may allow  
> you to track down those errors earlier.
>
> If you can identify one case that doesn't work and reproduce it, then  
> the solution should come out pretty easily.
>
> -Erik
>
> Alexander Zatko wrote:
>> In my app I have a XSLT processor that prepares config XML for  
>> sql-processor. The stylesheet contains a piece of logic that converts  
>> the current datetime into miliseconds that passed since 1/1/1970. (I  
>> added the "line 181" text to tie this snippet with the error below):
>>                                 <xsl:apply-templates><!-- convert  
>> current date into milliseconds -->
>>                                     <xsl:with-param name="timestamp">
>>                                         <!-- express duration between  
>> current date and jan 1 1970 in format PxxxDTxxxHxxxMxxxS -->
>>                                         <xsl:variable name="dur">
>>                                             <xsl:value-of  
>> select='xs:dateTime(current-dateTime()) -  
>> xs:dateTime("1970-01-01T00:00:00")'/>
>>                                         </xsl:variable>
>>                                         <!-- convert variable dur  
>> into miliseconds -->
>>                                         <xsl:value-of  
>> select="1000*(60*(60*(24*xs:decimal(substring-before(substring-
>> after($dur, 'P'), 'D')) +
>>                                              
>> xs:decimal(substring-before(substring-after($dur, 'T'), 'H'))) +
>>                                              
>> xs:decimal(substring-before(substring-after($dur, 'H'), 'M'))) +
>> line 181                              
>> xs:decimal(substring-before(substring-after($dur, 'M'), 'S')))"/>
>>                                     </xsl:with-param>
>>                                 </xsl:apply-templates>
>> The code works most of the time, but every once a while OPS throws an  
>> exception like this:
>> 2006-01-12 10:00:42,000 ERROR org.orbeon.oxf.pipeline.InitUtils null  
>> - Exception at oxf:/H3F/notice.xpl, line 181, column -1
>> ; SystemID: oxf:/H3F/notice.xpl; Line#: 181; Column#: -1
>> org.orbeon.saxon.xpath.DynamicError: Cannot convert string "" to  
>> decimal
>>     at  
>> org.orbeon.saxon.expr.ComputedExpression.dynamicError(ComputedExpressi
>> on.java:465)     at  
>> org.orbeon.saxon.expr.CastExpression.evaluateItem(CastExpression.java:
>> 106)
>>     at  
>> org.orbeon.saxon.expr.ArithmeticExpression$NumericArithmetic.evaluateI
>> tem(ArithmeticExpression.java:386)     at  
>> org.orbeon.saxon.expr.ArithmeticExpression$NumericArithmetic.evaluateI
>> tem(ArithmeticExpression.java:386)     at  
>> org.orbeon.saxon.expr.ArithmeticExpression$NumericArithmetic.evaluateI
>> tem(ArithmeticExpression.java:376)     at  
>> org.orbeon.saxon.expr.ArithmeticExpression$NumericArithmetic.evaluateI
>> tem(ArithmeticExpression.java:386)     at  
>> org.orbeon.saxon.expr.ComputedExpression.iterate(ComputedExpression.ja
>> va:408) Given that all input into this function is always present  
>> (right?) I have no clue what could ba causing this problem.  
>> Optionally, if there is a better method to generate this  
>> "miliseconds" string please let me know.
>> Alex.
>
>
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