Running custom Java functions within XSLT and SAXON (9.1.8)

Question

Meta

Saxon XSLT processor (v. 9.1.8)
Java
XSLT 2.0

I got a simple example of a java class file and some xsl transformation. My goal is to run my custom java functions from the class file within the XSLT process (via SAXON). How is this possible? When I start the below described batch file the cmd displays an error calling me the function is not known to saxon. So I have to add my class to the Java / or Saxon CLASSPATH?

The transformation should copy all XML data and (return &) display the dimension of imagefiles.

My XSL Transformation

<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:ImageInfo="java:ImageInfo"
version="2.0">

<xsl:output method="xml"/>
<xsl:template match="@* | node()">
    <xsl:copy>
        <xsl:apply-templates select="@* | node()"/>
    </xsl:copy>
<xsl:template/>

<xsl:template match="img">
    <xsl:copy>
        [image] file found: <xsl:value-of select="ImageInfo:getImageWidth(@src)"/> x <xsl:value-of select="ImageInfo:getImageHeight(@src)"/>
    </xsl:copy>
</xsl:template>

Java Class

import javax.swing.ImageIcon;
public class ImageInfo {

String filename;
ImageIcon img;

public ImageInfo(String filename) {
    this.filename = filename;
    img = new ImageIcon(filename);
}

public int getWidth() {
    return img.getIconWidth();
}

public int getHeight() {
    return img.getIconHeight();
}
}

Saxon command line call (via .BAT)

java -jar "%~dp0\saxonb9-1-0-8j\saxon9.jar" -s:"data.xml" -xsl:"transformation.xsl" -o:"result.xml"

I understand that this question is old, but I still will be hoping for answer - where I need to put custom java extension classes so that xsl can find them? — alalambda
– alalambda, Commented Mar 14, 2017 at 14:16

Martin Honnen · Accepted Answer · 2015-12-08 09:31:46Z

1

You need the -cp option of your java command e.g. java -cp ".;%~dp0\saxonb9-1-0-8j\saxon9.jar" net.sf.saxon.Transform -s:"data.xml" -xsl:"transformation.xsl" -o:"result.xml" where you need to make sure that the directory with your ImageInfo is on the class path, I have added ., assuming the class is in your current working directory.

However, note that ImageInfo:getImageWidth(@src) would try to call a static method getImageWidth, you have instance methods, the method you have is called getWidth and it does not take an argument.

See the documentation for that old version of Saxon 9, it should be available on http://saxon.sourceforge.net/.

answered Dec 8, 2015 at 9:31

Martin Honnen

169k6 gold badges100 silver badges122 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

garlicDoge Over a year ago

extending the classpath and adding the main class from saxon helped. thanks.

Martynas Jusevičius Over a year ago

Note that classpath separator will is OS-dependent - on Unix it's :

Michael Kay · Accepted Answer · 2015-12-08 10:10:37Z

1

Once you've sorted out your classpath problems as Martin suggests, the code you want will be something like this:

<xsl:variable name="image" select="ImageInfo:new(@src)"/>
[image] file found: 
   <xsl:value-of select="ImageInfo:getWidth($image)"/> x 
   <xsl:value-of select="ImageInfo:getHeight($image)"/>

answered Dec 8, 2015 at 10:10

Michael Kay

165k11 gold badges97 silver badges173 bronze badges

3 Comments

garlicDoge Over a year ago

thank you very much. is it neccessary to create a new java object in order to call the functions?

Michael Kay Over a year ago

The methods getWidth() and getHeight() are methods defined on an instance of a class, so yes, you can't call them without having an instance to apply them to.

garlicDoge Over a year ago

I see. So I´ve decided to create the object within the returning type methods themselves and let them take the input parameter from the methods. Works fine now. again - thanks for your help!

Collectives™ on Stack Overflow

Running custom Java functions within XSLT and SAXON (9.1.8)

2 Answers 2

2 Comments

3 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

3 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related