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Node-set to XML string via Java extensions in Xalan-J: possible?

Node-set to XML string via Java extensions in Xalan-J: possible?

2007-02-22       - By Kevin Cormier
Reply:     1     2     3     4     5     6     7  

Hi Mike,

The getDefaultMethodProperties(String method) method of the
org.apache.xml.serializer.OutputPropertiesFactory class is static, so you
can't call it on the instance that you've created.  You can call it like
this:

<xsl:variable name="formatprops"
select="java:org.apache.xml.serializer.OutputPropertiesFactory
.getDefaultMethodProperties('xml')"/>

As for the SerializerFactory, its constructor is private, so it can't be
instantiated directly.  You have to use the static getSerializer(Properties
format) method to obtain an instance.

Hope this helps.

Kevin Cormier
Software Developer, XSLT Development
IBM Toronto Lab, D1-435
Phone: 905-413-5771
E-mail:  kcormier@(protected)


                                                                         
            Mike Brown                                                    
            <mike@(protected)>                                              
                                                                       To
            02/22/2007 12:41          xalan-j-users@(protected)        
            PM                                                         cc
                                                                         
                                                                  Subject
                                      Node-set to XML string via Java    
                                      extensions in Xalan-J: possible?    
                                                                         
                                                                         
                                                                         
                                                                         
                                                                         
                                                                         




I'm trying to serialize nodes to an XML string, using Java extensions. I'm
trying to avoid writing my own. I thought perhaps I could use the
DOMSerializer in Xalan-J.

However, I'm having trouble calling certain methods. They're documented as
existing, but Xalan-J is not finding them. For example, I can instantiate
an
OutputPropertiesFactory, but I can't call its getDefaultMethodProperties()
method. And I can't instantiate a SerializerFactory at all.



Here is my XML:

<?xml version="1.0" encoding="utf-8"?>
<greetings>
 <greeting xml:lang="en">hello!</greeting>
 <greeting xml:lang="es">&#161;hola!</greeting>
 <greeting xml:lang="fr">bonjour!</greeting>
 <greeting
xml:lang="ru">&#1047;&#1076;&#1088;&#1072;&#1074;&#1089;&#1090;&#1074;&#1091;&
#1081;&#1090;&#1077;!</greeting>

 <greeting xml:lang="ja">&#20170;&#26085;&#12399;</greeting>
</greetings>


Here is my XSLT (the failure is when I try to create $formatprops):

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 xmlns:java="http://xml.apache.org/xalan/java">

 <xsl:output method="text" indent="no"/>

 <xsl:template match="/">
   <xsl:variable name="nodeset" select="/greetings"/>
   <!--OutputPropertiesFactory opropsfactory = new
OutputPropertiesFactory();-->
   <xsl:variable name="opropsfactory"
select="java:org.apache.xml.serializer.OutputPropertiesFactory.new()"/>
   <!--String method = org.apache.xml.serializer.Method.XML;
Properties formatprops =
opropsfactory.getDefaultMethodProperties(method);-->
   <xsl:variable name="formatprops"
select="java:getDefaultMethodProperties($opropsfactory, 'xml')"/>
   <!--SerializerFactory serializerfactory = new SerializerFactory();-->
   <xsl:variable name="serializerfactory"
select="java:org.apache.xml.serializer.SerializerFactory.new()"/>
            <!--Serializer serializer =
serializerfactory.getSerializer(formatprops);-->
            <xsl:variable name="serializer"
select="java:getSerializer($serializerfactory, $formatprops)"/>
            <!--StringWriter buffer = new StringWriter();-->
            <xsl:variable name="buffer"
select="java:java.io.StringWriter.new()"/>
            <!--serializer.setWriter(buffer);-->
            <xsl:variable name="void1" select="java:setWriter($serializer,
$buffer)"/>
            <!--DOMSerializer domserializer =
serializer.asDOMSerializer();-->
            <xsl:variable name="domserializer"
select="java:asDOMSerializer($serializer)"/>
            <!--domserializer.serialize(node);-->
            <xsl:variable name="void2"
select="java:serialize($domserializer, $nodeset)"/>
            <!--System.out.write(buffer.toString());-->
            <xsl:value-of select="java:toString($buffer)"/>
 </xsl:template>

</xsl:stylesheet>


Here is how I am invoking Xalan-J, and the error message:

C:\dev\test>java -Djava.endorsed.dirs=C:\dev\xalan-j_2_7_0 -cp
C:\dev\xalan-j_2_7_0\xalan.jar;C:\dev\xalan-j_2_7_0\serializer.jar
org.apache.xalan.xslt.Process -IN greetings.xml -XSL xalanserialize.xsl
-EDUMP

; SystemID: file:///C:/dev/test/xalanserialize.xsl; Line#: 14; Column#: 103
javax.xml.transform.TransformerException: java.lang.NoSuchMethodException:
For extension function, could not find method
org.apache.xml.serializer.OutputPropertiesFactory.getDefaultMethodProperties(
[ExpressionContext,]
#STRING).
       at
org.apache.xalan.extensions.ExtensionHandlerJavaPackage.callFunction
(ExtensionHandlerJavaPackage.java:420)

       at
org.apache.xalan.extensions.ExtensionHandlerJavaPackage.callFunction
(ExtensionHandlerJavaPackage.java:438)

       at
org.apache.xalan.extensions.ExtensionsTable.extFunction(ExtensionsTable.java
:220)

       at
org.apache.xalan.transformer.TransformerImpl.extFunction(TransformerImpl.java
:473)

       at
org.apache.xpath.functions.FuncExtFunction.execute(FuncExtFunction.java:206)

       at org.apache.xpath.XPath.execute(XPath.java:335)
       at
org.apache.xalan.templates.ElemVariable.getValue(ElemVariable.java:278)
       at
org.apache.xalan.templates.ElemVariable.execute(ElemVariable.java:246)
       at
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates
(TransformerImpl.java:2411)

       at
org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode
(TransformerImpl.java:2281)

       at
org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.java
:1367)

       at
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:709)

       at
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java
:1284)

       at
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java
:1262)

       at org.apache.xalan.xslt.Process.main(Process.java:1046)
---------
java.lang.NoSuchMethodException: For extension function, could not find
method
org.apache.xml.serializer.OutputPropertiesFactory.getDefaultMethodProperties(
[ExpressionContext,]
#STRING).
       at
org.apache.xalan.extensions.MethodResolver.getMethod(MethodResolver.java:274)

       at
org.apache.xalan.extensions.ExtensionHandlerJavaPackage.callFunction
(ExtensionHandlerJavaPackage.java:381)

       at
org.apache.xalan.extensions.ExtensionHandlerJavaPackage.callFunction
(ExtensionHandlerJavaPackage.java:438)

       at
org.apache.xalan.extensions.ExtensionsTable.extFunction(ExtensionsTable.java
:220)

       at
org.apache.xalan.transformer.TransformerImpl.extFunction(TransformerImpl.java
:473)

       at
org.apache.xpath.functions.FuncExtFunction.execute(FuncExtFunction.java:206)

       at org.apache.xpath.XPath.execute(XPath.java:335)
       at
org.apache.xalan.templates.ElemVariable.getValue(ElemVariable.java:278)
       at
org.apache.xalan.templates.ElemVariable.execute(ElemVariable.java:246)
       at
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates
(TransformerImpl.java:2411)

       at
org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode
(TransformerImpl.java:2281)

       at
org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.java
:1367)

       at
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:709)

       at
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java
:1284)

       at
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java
:1262)

       at org.apache.xalan.xslt.Process.main(Process.java:1046)
Exception in thread "main" java.lang.RuntimeException:
java.lang.NoSuchMethodException: For extension function, could not find
method
org.apache.xml.serializer.OutputPropertiesFactory.getDefaultMethodProperties(
[ExpressionContext,]
#STRING).
       at org.apache.xalan.xslt.Process.doExit(Process.java:1153)
       at org.apache.xalan.xslt.Process.main(Process.java:1126)


If I try to create the SerializerFactory first, I get a similar error about
its constructor
not being found. Am I doing something wrong?

Thanks,
Mike