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/*
* Sun Public License Notice
*
* The contents of this file are subject to the Sun Public License
* Version 1.0 (the "License"). You may not use this file except in
* compliance with the License. A copy of the License is available at
* http://www.sun.com/
*
* The Original Code is NetBeans. The Initial Developer of the Original
* Code is Sun Microsystems, Inc. Portions Copyright 1997-2002 Sun
* Microsystems, Inc. All Rights Reserved.
*/
package org.netbeans.spi.xml.cookies;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.net.URL;
import java.security.ProtectionDomain;
import java.security.CodeSource;
import org.xml.sax.EntityResolver;
import org.xml.sax.XMLReader;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.Source;
import javax.xml.transform.Result;
import javax.xml.transform.ErrorListener;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.URIResolver;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stream.StreamSource;
import org.openide.filesystems.FileObject;
import org.netbeans.api.xml.cookies.*;
import org.netbeans.api.xml.services.UserCatalog;
/**
* Perform Transform action on XML document.
* Default implementation of {@link TransformableCookie} cookie.
*
* @author Libor Kramolis
*/
public final class TransformableSupport implements TransformableCookie {
// associated source
private final Source source;
/** cached TransformerFactory instance. */
private static TransformerFactory transformerFactory;
/**
* Create new TransformableSupport for given data object.
* @param source Supported Source .
*/
public TransformableSupport (Source source) {
if (source == null) throw new NullPointerException();
this.source = source;
}
/**
* Transform this object by XSL Transformation.
*
* @param transformSource source of transformation.
* @param outputResult result of transformation.
* @param listener optional listener (null allowed)
* giving judgement details.
* @throws TransformerException if an unrecoverable error occurs during the course of the transformation
*/
public void transform (Source transformSource, Result outputResult, CookieObserver notifier) throws TransformerException {
try {
if ( Util.THIS.isLoggable() ) /* then */ {
Util.THIS.debug ("TransformableSupport.transform");
Util.THIS.debug (" transformSource = " + transformSource.getSystemId());
Util.THIS.debug (" outputResult = " + outputResult.getSystemId());
}
Source xmlSource = source;
if ( Util.THIS.isLoggable() ) /* then */ Util.THIS.debug (" xmlSource = " + xmlSource.getSystemId());
// prepare transformer == parse stylesheet, errors may occur
Transformer transformer = newTransformer (transformSource);
// transform
if (notifier != null) {
// inform user about used implementation
ProtectionDomain domain = transformer.getClass().getProtectionDomain();
CodeSource codeSource = domain.getCodeSource();
if (codeSource == null) {
notifier.receive(new CookieMessage(Util.THIS.getString("BK000", transformer.getClass().getName())));
} else {
URL location = codeSource.getLocation();
notifier.receive(new CookieMessage(Util.THIS.getString("BK001", location, transformer.getClass().getName())));
}
Proxy proxy = new Proxy (notifier);
transformer.setErrorListener (proxy);
}
transformer.transform (xmlSource, outputResult);
} catch (Exception exc) { // TransformerException, ParserConfigurationException, SAXException, FileStateInvalidException
if ( Util.THIS.isLoggable() ) /* then */ {
Util.THIS.debug (" EXCEPTION during transformation: " + exc.getClass().getName(), exc);
Util.THIS.debug (" exception's message = " + exc.getLocalizedMessage());
Throwable tempExc = unwrapException (exc);
Util.THIS.debug (" wrapped exception = " + tempExc.getLocalizedMessage());
}
TransformerException transExcept = null;
Object detail = null;
if ( exc instanceof TransformerException ) {
transExcept = (TransformerException)exc;
if ( ( notifier != null ) &&
( exc instanceof TransformerConfigurationException ) ) {
detail = new DefaultXMLProcessorDetail (transExcept);
}
} else if ( exc instanceof SAXParseException ) {
transExcept = new TransformerException (exc);
if ( notifier != null ) {
detail = new DefaultXMLProcessorDetail ((SAXParseException)exc);
}
} else {
transExcept = new TransformerException (exc);
if ( notifier != null ) {
detail = new DefaultXMLProcessorDetail (transExcept);
}
}
if ( ( notifier != null ) &&
( detail != null ) ) {
CookieMessage message = new CookieMessage
(message(exc),
CookieMessage.FATAL_ERROR_LEVEL,
detail);
notifier.receive (message);
}
if ( Util.THIS.isLoggable() ) /* then */ Util.THIS.debug ("--> throw transExcept: " + transExcept);
throw transExcept;
} // catch (Exception exc)
}
//
// utils
//
private static Throwable unwrapException (Throwable exc) {
Throwable wrapped = null;
if (exc instanceof TransformerException) {
wrapped = ((TransformerException) exc).getException();
} else if (exc instanceof SAXException) {
wrapped = ((SAXException) exc).getException();
} else {
return exc;
}
if ( wrapped == null ) {
return exc;
}
return unwrapException (wrapped);
}
private static URIResolver getURIResolver () {
UserCatalog catalog = UserCatalog.getDefault();
URIResolver res = (catalog == null ? null : catalog.getURIResolver());
return res;
}
private static TransformerFactory getTransformerFactory () {
if ( transformerFactory == null ) {
transformerFactory = TransformerFactory.newInstance();
transformerFactory.setURIResolver (getURIResolver()); //!!! maybe that it should be set every call if UsersCatalog instances are dynamic
}
return transformerFactory;
}
private static Transformer newTransformer (Source xsl) throws TransformerConfigurationException {
return getTransformerFactory().newTransformer (xsl);
}
/**
* Extract message from exception or use exception name.
*/
private static String message(Throwable t) {
String msg = t.getLocalizedMessage();
return (msg!=null ? msg : new ExceptionWriter(t).toString());
}
/**
* Print first four exception lines.
*/
private static class ExceptionWriter extends PrintWriter {
private int counter = 4;
private Throwable t;
public ExceptionWriter(Throwable t) {
super(new StringWriter());
this.t = t;
}
public void println(String s) {
if (counter-- > 0) super.println(s);
}
public void println(Object o) {
if (counter-- > 0) super.println(o);
}
public String toString() {
t.printStackTrace(this);
flush();
return ((StringWriter)out).getBuffer().toString();
}
}
//
// class Proxy
//
private static class Proxy implements ErrorListener {
private final CookieObserver peer;
public Proxy (CookieObserver peer) {
if (peer == null) {
throw new NullPointerException();
}
this.peer = peer;
}
public void error (TransformerException tex) throws TransformerException {
report (CookieMessage.ERROR_LEVEL, tex);
}
public void fatalError (TransformerException tex) throws TransformerException {
report (CookieMessage.FATAL_ERROR_LEVEL, tex);
throw tex;
}
public void warning (TransformerException tex) throws TransformerException {
report (CookieMessage.WARNING_LEVEL, tex);
}
private void report (int level, TransformerException tex) throws TransformerException {
if ( Util.THIS.isLoggable() ) /* then */ {
Util.THIS.debug ("[TransformableSupport::Proxy]: report [" + level + "]: ", tex);
Util.THIS.debug (" exception's message = " + tex.getLocalizedMessage());
Throwable tempExc = unwrapException (tex);
Util.THIS.debug (" wrapped exception = " + tempExc.getLocalizedMessage());
}
Throwable unwrappedExc = unwrapException (tex);
CookieMessage message = new CookieMessage (
message(unwrappedExc),
level,
new DefaultXMLProcessorDetail (tex)
);
peer.receive (message);
}
} // class Proxy
}
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