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package com.jclark.xsl.sax;
import java.io.IOException;
import java.io.File;
import java.io.Writer;
import java.net.URL;
import java.util.Enumeration;
import javax.servlet.*;
import javax.servlet.http.*;
import org.xml.sax.*;
public class XSLServlet extends HttpServlet {
private XSLProcessor cached;
public void init() throws ServletException {
String stylesheet = getInitParameter("stylesheet");
if (stylesheet == null)
throw new ServletException("missing stylesheet parameter");
cached = new XSLProcessorImpl();
cached.setParser(createParser());
try {
cached.loadStylesheet(new InputSource(getServletContext().getResource(stylesheet).toString()));
}
catch (SAXException e) {
throw new ServletException(e);
}
catch (IOException e) {
throw new ServletException(e);
}
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
File inputFile = new File(request.getPathTranslated());
if (!inputFile.isFile()) {
inputFile = new File(request.getPathTranslated() + ".xml");
if (!inputFile.isFile()) {
response.sendError(HttpServletResponse.SC_NOT_FOUND,
"File not found: " + request.getPathTranslated());
return;
}
}
XSLProcessor xsl = (XSLProcessor)cached.clone();
xsl.setParser(createParser());
for (Enumeration e = request.getParameterNames(); e.hasMoreElements();) {
String name = (String)e.nextElement();
// What to do about multiple values?
xsl.setParameter(name, request.getParameter(name));
}
OutputMethodHandlerImpl outputMethodHandler = new OutputMethodHandlerImpl(xsl);
xsl.setOutputMethodHandler(outputMethodHandler);
outputMethodHandler.setDestination(new ServletDestination(response));
try {
xsl.parse(fileInputSource(inputFile));
}
catch (SAXException e) {
throw new ServletException(e);
}
}
static Parser createParser() throws ServletException {
String parserClass = System.getProperty("com.jclark.xsl.sax.parser");
if (parserClass == null)
parserClass = System.getProperty("org.xml.sax.parser");
if (parserClass == null)
parserClass = "com.jclark.xml.sax.CommentDriver";
try {
return (Parser)Class.forName(parserClass).newInstance();
}
catch (ClassNotFoundException e) {
throw new ServletException(e);
}
catch (InstantiationException e) {
throw new ServletException(e);
}
catch (IllegalAccessException e) {
throw new ServletException(e);
}
catch (ClassCastException e) {
throw new ServletException(parserClass + " is not a SAX driver");
}
}
/**
* Generates an <code>InputSource</code> from a file name.
*/
static public InputSource fileInputSource(File file) {
String path = file.getAbsolutePath();
String fSep = System.getProperty("file.separator");
if (fSep != null && fSep.length() == 1)
path = path.replace(fSep.charAt(0), '/');
if (path.length() > 0 && path.charAt(0) != '/')
path = '/' + path;
try {
return new InputSource(new URL("file", "", path).toString());
}
catch (java.net.MalformedURLException e) {
/* According to the spec this could only happen if the file
protocol were not recognized. */
throw new Error("unexpected MalformedURLException");
}
}
}
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