zongaro 2003/02/04 08:21:00
Modified: java/samples/CompiledServlet Tag: XSLTC_DTM
TransformServlet.java
Log:
Changed sample to use JAXP transform API along with XSLTC's "use-classpath"
attribute to load precompiled stylesheets, instead of using the XSLTC Native
API.
Also changed imports to import minimal number of classes and interfaces.
Revision Changes Path
No revision
No revision
1.2.2.2 +36 -67
xml-xalan/java/samples/CompiledServlet/TransformServlet.java
Index: TransformServlet.java
===================================================================
RCS file:
/home/cvs/xml-xalan/java/samples/CompiledServlet/TransformServlet.java,v
retrieving revision 1.2.2.1
retrieving revision 1.2.2.2
diff -u -r1.2.2.1 -r1.2.2.2
--- TransformServlet.java 27 Jan 2003 19:43:38 -0000 1.2.2.1
+++ TransformServlet.java 4 Feb 2003 16:21:00 -0000 1.2.2.2
@@ -61,38 +61,35 @@
*
*/
-import java.io.*;
-import java.text.*;
-import java.util.*;
-
-import javax.servlet.*;
-import javax.servlet.http.*;
-
-import org.xml.sax.*;
-
-import org.apache.xalan.xsltc.*;
-import org.apache.xalan.xsltc.runtime.AbstractTranslet;
-import org.apache.xalan.xsltc.runtime.output.*;
-import org.apache.xalan.xsltc.dom.*;
+import java.io.IOException;
+import java.io.PrintWriter;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.stream.StreamResult;
+import javax.xml.transform.stream.StreamSource;
+
+import org.xml.sax.SAXException;
/**
* This servlet demonstrates how XSL transformations can be made available as
* a web service. See the CompileServlet for an example on how stylesheets
* can be pre-compiled before this servlet is invoked.
*
- * Note that the XSLTC transformation engine is invoked through its native
- * interface and not the javax.xml.transform (JAXP) interface. This because
- * XSLTC still does not offer precompiled transformations through JAXP.
+ * Note that the XSLTC transformation engine is invoked through the JAXP
+ * interface, using the XSLTC "use-classpath" attribute. The
+ * "use-classpath" attribute specifies to the XSLTC TransformerFactory
+ * that a precompiled version of the stylesheet (translet) may be available,
+ * and that that should be used in preference to recompiling the stylesheet.
*/
public final class TransformServlet extends HttpServlet {
- /*
- * This is a document cache with 32 document slots. This servlet returns
- * cache statistics if the 'stats' parameter is passed with the HTTP
- * request in doGet().
- */
- private static DocumentCache cache = null;
-
/**
* Main servlet entry point
*/
@@ -105,62 +102,34 @@
PrintWriter out = response.getWriter();
// Get the two paramters "class" and "source".
- String className = request.getParameter("class");
- String documentURI = request.getParameter("source");
+ String transletName = request.getParameter("translet");
+ String documentURI = request.getParameter("source");
try {
- // Initialize document cache with 32 DOM slots
- if (cache == null) cache = new DocumentCache(32);
-
- if (request.getParameter("stats") != null) {
- cache.getStatistics(out);
- }
- else if ((className == null) || (documentURI == null)) {
+ if ((transletName == null) || (documentURI == null)) {
out.println("<h1>XSL transformation error</h1>");
out.println("The parameters <b><tt>class</tt></b> and " +
"<b><tt>source</tt></b> must be specified");
}
else {
- // Get a reference to the translet class (not object yet)
- Class tc = Class.forName(className);
- // Instanciate a translet object (inherits AbstractTranslet)
- AbstractTranslet translet = (AbstractTranslet)tc.newInstance();
-
- // Set the document cache for the translet. This is needed in
- // case the translet uses the document() function.
- translet.setDOMCache(cache);
-
- // Read input document from the DOM cache
- DOMImpl dom = cache.retrieveDocument(documentURI, 0, translet);
-
- // Create output handler
- TransletOutputHandlerFactory tohFactory =
- TransletOutputHandlerFactory.newInstance();
- tohFactory.setOutputType(TransletOutputHandlerFactory.STREAM);
- tohFactory.setEncoding(translet._encoding);
- tohFactory.setOutputMethod(translet._method);
- tohFactory.setWriter(out);
+ TransformerFactory tf = TransformerFactory.newInstance();
+ try {
+ tf.setAttribute("use-classpath", Boolean.TRUE);
+ } catch (IllegalArgumentException iae) {
+ System.err.println(
+ "Could not set XSLTC-specific TransformerFactory "
+ + "attributes. Transformation failed.");
+ }
+ Transformer t =
+ tf.newTransformer(new StreamSource(transletName));
// Start the transformation
final long start = System.currentTimeMillis();
- translet.transform(dom, tohFactory.getTransletOutputHandler());
+ t.transform(new StreamSource(documentURI),
+ new StreamResult(out));
final long done = System.currentTimeMillis() - start;
out.println("<!-- transformed by XSLTC in "+done+"msecs -->");
}
- }
- catch (IOException e) {
- out.println("<h1>Error</h1>");
- out.println("Could not locate source document: " + documentURI);
- out.println(e.toString());
- }
- catch (ClassNotFoundException e) {
- out.println("<h1>Error</h1>");
- out.println("Could not locate the translet class: " + className);
- out.println(e.toString());
- }
- catch (SAXException e) {
- out.println("<h1>Error</h1>");
- out.println("Error parsing document " + documentURI);
}
catch (Exception e) {
out.println("<h1>Error</h1>");
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