Thanks Michael
I think I found the method getFontMetrics(font) in Java class java.awt.Graphics
http://java.sun.com/j2se/1.4.2/docs/api/java/awt/Graphics.html
I added -TJ as a parameter but I'm not convinced <oXygen/> is paying attention
to it.
My error message now seems to be the result of my incorrect use of the method:
Error in call to extension function {public java.awt.FontMetrics
java.awt.Graphics.getFontMetrics()}: Cannot convert supplied XPath value to the
required type for the extension function.
I have tried several values for $font as well as placing the font name directly
in the parameter list with the same result.
My revised stylesheet is:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; version="2.0"
xmlns:FontMetrics="ext://java.awt.Graphics">
<xsl:output indent="yes"/>
<xsl:template match="/">
<!-- establish a font name -->
<xsl:variable name="font" select="'HelveticaWorld-Regular'"/>
<!-- obtain the metrics for a specified font -->
<xsl:variable name="metrics" select="FontMetrics:getFontMetrics($font)"/>
<!-- display the result -->
<xsl:message>result:<xsl:value-of select="$metrics"/></xsl:message>
</xsl:template>
</xsl:stylesheet>
-----Original Message-----
From: Michael Kay [mailto:mike(_at_)saxonica(_dot_)com]
Sent: Monday, December 22, 2008 10:01 AM
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: RE: [xsl] Using Java in XSLT to determine font metrics
As far as I can see the Java class java.awt.FontMetrics does not have a method
getFontMetrics().
Generally, you may find the command line option -TJ useful for debugging this
kind of problem.
Also, please get out of the habit of writing this kind of code:
<xsl:variable name="metrics">
<xsl:value-of select="FontMetrics:getFontMetrics()"/>
</xsl:variable>
when you mean
<xsl:variable name="metrics" select="FontMetrics:getFontMetrics()"/>
This is always highly inefficient, and when you are manipulating external Java
objects it will almost certainly make your code incorrect, because you really
don't want to convert the object to a string.
Michael Kay
http://www.saxonica.com/
-----Original Message-----
From: Ylvisaker, Steve
[mailto:steve(_dot_)j(_dot_)ylvisaker(_at_)medtronic(_dot_)com]
Sent: 22 December 2008 15:37
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: [xsl] Using Java in XSLT to determine font metrics
This is my first attempt at calling an external Java method to do work
on behalf of a stylesheet. I'm not a Java developer so I think I need
a fairly complete "cookbook"
description of how to do this. My objective is to determine the exact
length, in pixels, of a given string based on the font and font size
in play.
I'm sure I have two problems here. (1) to properly bind my stylesheet
to a Java name space and (2) proper use of the Java methods that
parse my font and return the metrics I'm looking for.
Following is my failed stylesheet, annotated with comments explaining
what I am "trying" to do at each step. I am very certain that I am
not properly telling whomever which font I am using.
I am working within the <oXygen/> IDE (Saxon8) and have successfully
gotten the example on page 134 of Michael's XSLT 2.0 3rd Edition to
work. This tells me that I am somewhat successful in using Java
extensions.
When I process this stylesheet I get the following error:
Cannot find a matching 0-argument function named
{ext://java.awt.FontMetrics}getFontMetrics()
Unfortunately this error message doesn't tell me if the problem is
that I'm not finding the Java method or if I'm finding it but not
using it properly.
<?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; version="2.0"
xmlns:FontMetrics="ext://java.awt.FontMetrics">
<xsl:output indent="yes"/>
<xsl:template match="/">
<xsl:variable name="tstString" select="'Hello World'"/>
<!-- declair a font and fontsize - not shure who is listening to this
-->
FontMetrics:Font("helveticaWorld", Font.PLAIN, 10)
<!-- obtain the metrics for the specified font -->
<xsl:variable name="metrics">
<xsl:value-of select="FontMetrics:getFontMetrics()"/>
</xsl:variable>
<!-- obtain the length in pixels of the test string -->
<xsl:variable name="resultStringLength">
<xsl:value-of select="metrics.stringWidth($tstString)"/>
</xsl:variable>
<!-- display the result -->
<xsl:message>result:<xsl:value-of
select="$resultStringLength"/></xsl:message>
</xsl:template>
</xsl:stylesheet>
Thanks in advance for you help. Please keep in mind that I am not a
Java developer at all so nothing is obvious to me.
Steve Ylvisaker
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