package com.jclark.xml.sax;

import java.io.IOException;
import org.xml.sax.*;
import org.xml.sax.helpers.ParserAdapter;

/**
 * SAX2 wrapper for XP.
 * This wrapper reports that XP doesn't validate,
 * and that it always processes external entities.
 * Although this parser could partially support a LexicalHandler property
 * (to expose comments), it doesn't.
 */
public class SAX2Driver extends ParserAdapter
{
    public SAX2Driver ()
    {
	super (new Driver ());
    }

    public boolean getFeature (String id)
    throws SAXNotRecognizedException, SAXNotSupportedException
    {
	if ("http://xml.org/sax/features/validation".equals (id))
	    return false;
	if ("http://xml.org/sax/features/external-general-entities"
		.equals (id))
	    return true;
	if ("http://xml.org/sax/features/external-parameter-entities"
		.equals (id))
	    return true;

	return super.getFeature (id);
    }

    public void setFeature (String id, boolean value)
    throws SAXNotRecognizedException, SAXNotSupportedException
    {
	boolean	current = getFeature (id);

	if (current == value)
	    return;
	if ("http://xml.org/sax/features/validation".equals (id)
		|| "http://xml.org/sax/features/external-general-entities"
			.equals (id)
		|| "http://xml.org/sax/features/external-parameter-entities"
			.equals (id))
	    throw new SAXNotSupportedException (id);
	super.setFeature (id, value);
    }

    public void parse (InputSource in)
    throws SAXException, IOException
    {
	try {
	    super.parse (in);
	    // calls endDocument once, except not
	    // when handling an aborted parse
	} catch (IOException e) {
	    ContentHandler handler = getContentHandler ();
	    if (handler != null) handler.endDocument ();
	    throw e;
	} catch (RuntimeException e) {
	    ContentHandler handler = getContentHandler ();
	    if (handler != null) handler.endDocument ();
	    throw e;
	} catch (SAXException e) {
	    ContentHandler handler = getContentHandler ();
	    if (handler != null) handler.endDocument ();
	    throw e;
	}
    }
}