// DefaultHandler2.java - extended DefaultHandler
// http://www.saxproject.org
// Public Domain: no warranty.
// $Id: DefaultHandler2.java 226184 2005-04-08 10:53:24Z neeraj $

package org.xml.sax.ext;

import java.io.IOException;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;


This class extends the SAX2 base handler class to support the SAX2 LexicalHandler, DeclHandler, and EntityResolver2 extensions. Except for overriding the original SAX1 resolveEntity() method the added handler methods just return. Subclassers may override everything on a method-by-method basis. 

This module, both source code and documentation, is in the
Public Domain, and comes with NO WARRANTY.

 Note: this class might yet learn that the
ContentHandler.setDocumentLocator() call might be passed a Locator2 object, and that the ContentHandler.startElement() call might be passed a Attributes2 object. 
Author:
David Brownell
Since:
SAX 2.0 (extensions 1.1 alpha)
Version:
TBS/**
 * This class extends the SAX2 base handler class to support the
 * SAX2 {@link LexicalHandler}, {@link DeclHandler}, and
 * {@link EntityResolver2} extensions.  Except for overriding the
 * original SAX1 {@link DefaultHandler#resolveEntity resolveEntity()}
 * method the added handler methods just return.  Subclassers may
 * override everything on a method-by-method basis.
 *
 * <blockquote>
 * <em>This module, both source code and documentation, is in the
 * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
 * </blockquote>
 *
 * <p> <em>Note:</em> this class might yet learn that the
 * <em>ContentHandler.setDocumentLocator()</em> call might be passed a
 * {@link Locator2} object, and that the
 * <em>ContentHandler.startElement()</em> call might be passed a
 * {@link Attributes2} object.
 *
 * @since SAX 2.0 (extensions 1.1 alpha)
 * @author David Brownell
 * @version TBS
 */
public class DefaultHandler2 extends DefaultHandler
    implements LexicalHandler, DeclHandler, EntityResolver2
{
    
Constructs a handler which ignores all parsing events. /** Constructs a handler which ignores all parsing events. */
    public DefaultHandler2 () { }


    // SAX2 ext-1.0 LexicalHandler

    public void startCDATA ()
    throws SAXException
	{}

    public void endCDATA ()
    throws SAXException
	{}

    public void startDTD (String name, String publicId, String systemId)
    throws SAXException
	{}

    public void endDTD ()
    throws SAXException
	{}

    public void startEntity (String name)
    throws SAXException
	{}

    public void endEntity (String name)
    throws SAXException
	{}

    public void comment (char ch [], int start, int length)
    throws SAXException
	{ }


    // SAX2 ext-1.0 DeclHandler

    public void attributeDecl (String eName, String aName,
	    String type, String mode, String value)
    throws SAXException
	{}

    public void elementDecl (String name, String model)
    throws SAXException
	{}

    public void externalEntityDecl (String name,
    	String publicId, String systemId)
    throws SAXException
	{}

    public void internalEntityDecl (String name, String value)
    throws SAXException
	{}

    // SAX2 ext-1.1 EntityResolver2

    
Tells the parser that if no external subset has been declared
in the document text, none should be used.
/**
     * Tells the parser that if no external subset has been declared
     * in the document text, none should be used.
     */
    public InputSource getExternalSubset (String name, String baseURI)
    throws SAXException, IOException
	{ return null; }

    
Tells the parser to resolve the systemId against the baseURI and read the entity text from that resulting absolute URI. Note that because the older DefaultHandler.resolveEntity(), method is overridden to call this one, this method may sometimes be invoked with null name and baseURI, and
with the systemId already absolutized.
/**
     * Tells the parser to resolve the systemId against the baseURI
     * and read the entity text from that resulting absolute URI.
     * Note that because the older
     * {@link DefaultHandler#resolveEntity DefaultHandler.resolveEntity()},
     * method is overridden to call this one, this method may sometimes 
     * be invoked with null <em>name</em> and <em>baseURI</em>, and
     * with the <em>systemId</em> already absolutized.
     */
    public InputSource resolveEntity (String name, String publicId,
	    String baseURI, String systemId)
    throws SAXException, IOException
	{ return null; }
    
    // SAX1 EntityResolver

    
Invokes EntityResolver2.resolveEntity() with null entity name and base URI. You only need to override that method to use this class. /**
     * Invokes
     * {@link EntityResolver2#resolveEntity EntityResolver2.resolveEntity()}
     * with null entity name and base URI.
     * You only need to override that method to use this class.
     */
    public InputSource resolveEntity (String publicId, String systemId)
    throws SAXException, IOException
	{ return resolveEntity (null, publicId, null, systemId); }
}