Ard Schrijvers wrote:
> > > I'm wondering if there is a way to pre-compile XSLT into Java
> > > classes, using the command-line xsltc compiler, put those classes
> > > somewhere in Cocoon's classpath and use them as transformers.
> >
> > Actually, since Cocoon can already run the cached compiled
> > stylesheets it shouldn't be that hard to get it to use them in the
> > first place.
>
> Yes. You can take a look at the excalibur xmlutil in
> org.apache.excalibur.xml.xslt.XSLTProcessorImpl and write your own
> that for example first looks at compiled version at some place.
Thank you for your suggestion.
I was able to understand how XSLTProcessor, TraxProcessor, and
TraxTransformer relate to one another and I could write my own
xslt-processor-role that loads pre-compiled stylesheets from the
classpath.
Here it is, if anybody is interested or wants to take it from here.
Suggestions are welcome.
Tobia
=== cocoon.xconf =======================================================
<component class="ClassLoadingTraxProcessor" logger="core.xslt"
role="org.apache.excalibur.xml.xslt.XSLTProcessor/clxsltc">
<parameter name="use-store" value="true"/>
<parameter name="transformer-factory"
value="org.apache.xalan.xsltc.trax.TransformerFactoryImpl"/>
</component>
=== sitemap.xmap =======================================================
<transformer name="clxsltc"
src="org.apache.cocoon.transformation.TraxTransformer">
<xslt-processor-role>clxsltc</xslt-processor-role>
</transformer>
...
<transform src="test.class" type="clxsltc"/>
=== Java patch =========================================================
--- cocoon-2.1.10/src/java/org/apache/cocoon/components/xslt/TraxProcessor.java
2006-12-19 12:03:37.000000000 +0100
+++ ClassLoadingTraxProcessor.java 2007-10-23 18:03:34.000000000 +0200
@@ -14,7 +14,7 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
-package org.apache.cocoon.components.xslt;
+import org.apache.cocoon.components.xslt.*;
import java.io.File;
import java.io.IOException;
@@ -72,6 +72,14 @@
-public class TraxProcessor extends AbstractLogEnabled implements
XSLTProcessor, Serviceable, Initializable, Disposable, Parameterizable,
+public class ClassLoadingTraxProcessor extends AbstractLogEnabled implements
XSLTProcessor, Serviceable, Initializable, Disposable, Parameterizable,
Recyclable, URIResolver {
+
+ private class SourceWrapper implements javax.xml.transform.Source {
+ private String id;
+ public SourceWrapper(String id) { this.id = id; }
+ public String getSystemId() { return id; }
+ public void setSystemId(String id) {}
+ }
+
/** The store service instance */
protected Store m_store;
@@ -208,6 +216,36 @@
TraxErrorListener errorListener = new TraxErrorListener(getLogger(),
stylesheet.getURI());
try{
+
+ if (m_factory instanceof
org.apache.xalan.xsltc.trax.TransformerFactoryImpl
+ && id.endsWith(".class")) {
+
+ // custom code to load pre-compiled translet
from the classpath
+
+ if(getLogger().isDebugEnabled())
+ getLogger().debug("Loading Templates
from classpath " + id);
+
+ m_factory.setAttribute("use-classpath",
Boolean.TRUE);
+
+ final Templates template =
m_factory.newTemplates(new SourceWrapper(id));
+
+ putTemplates(template, stylesheet, id);
+
+ final TransformerHandler handler =
m_factory.newTransformerHandler(template);
+
handler.getTransformer().setErrorListener(errorListener);
+ handler.getTransformer().setURIResolver(this);
+
+ m_factory.setAttribute("use-classpath",
Boolean.FALSE);
+
+ final SourceValidity alwaysValid = new
SourceValidity() {
+ public int isValid() { return 1; }
+ public int isValid(SourceValidity
newValidity) { return 1; }
+ };
+
+ return new
MyTransformerHandlerAndValidity(handler, alwaysValid);
+ // end custom code
+ }
+
if (getLogger().isDebugEnabled()) {
getLogger().debug("Creating new Templates for " + id);
}
