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Igor KarpSubject: exception while calling java function with long argument
Author: Igor Karp
Date: 23 May 2007 01:42 PM
Hello All,

I am trying to use Java extension function to convert timestamps to local timezone. I am having trouble passing parameter of the type long to java.util.TimeZone getOffset method, but what is strange that the same value can be passed as a long to java.util.Date constructor.

The minimal example is below:

xml:
<?xml version="1.0"?>
<root>
<start_utc>2007-05-24T11:11:11Z</start_utc>
</root>

xslt:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" version="2.0" exclude-result-prefixes="xs">
<xsl:output method="xml" indent="yes"/>

<xsl:variable name="tz">
<xsl:value-of xmlns:tz="java:java.util.TimeZone" select="tz:get-time-zone('Europe/Berlin')"/>
</xsl:variable>

<xsl:template match="start_utc">
<xsl:variable name="start_unix" as="xs:long">
<xsl:value-of select="((. cast as xs:dateTime - '1970-01-01T00:00:00Z' cast as xs:dateTime) div 'PT0.001S' cast as xs:dayTimeDuration) cast as xs:long"/>
</xsl:variable>
<testt>
<xsl:value-of xmlns:tz="java:java.util.TimeZone" select="tz:get-offset($tz, $start_unix)"/>
</testt>
<testd>
<xsl:value-of xmlns:d="java:java.util.Date" select="d:new($start_unix)"/>
</testd>
</xsl:template>

</xsl:transform>

the error i get is:
SXJE0021: Error in call to extension function {public int java.util.TimeZone.getOffset(long)}: Cannot convert supplied XPath value to the required type for the extension function

I have a workaround but I would really like to get some ideas how to fix this.

Regards,
Igor

Postnext
Minollo I.Subject: exception while calling java function with long argument
Author: Minollo I.
Date: 23 May 2007 03:22 PM
This seems a Saxon specific question, better asked on the Saxon discussion list. The problem is with the first argument, not the second one; a quick way to make it work is:
<xsl:value-of xmlns:tz="java:java.util.TimeZone" select="tz:get-offset(tz:get-time-zone('Europe/Berlin'), $start_unix)"/>

There are ways to declare variables as Java types in Saxon (wrapped java objects), but I haven't tried doing that.
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James DurningSubject: exception while calling java function with long argument
Author: James Durning
Date: 24 May 2007 01:18 PM
You appear to be calling the function with incorrect arguments. See:
http://java.sun.com/j2se/1.5.0/docs/api/java/util/TimeZone.html

The 2 possible ways to call this are
getOffset(int era, int year, int month, int day, int dayOfWeek, int milliseconds) OR
getOffset(long date)
but you are passing in 2 arguments.

I think you want:
<xsl:value-of xmlns:tz="java:java.util.TimeZone" select="tz:get-offset($start_unix)"/>
without the $tz passed in as an argument.

   
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