/*
 * The Apache Software License, Version 1.1
 * 
 * Copyright (c) 1999-2000 The Apache Software Foundation.  All rights
 * reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 * 
 * 4. The names "Xerces" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
 *    permission, please contact apache\@apache.org.
 * 
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 * 
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation, and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.ibm.com .  For more information
 * on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

/*
 * $Log: SAX2XMLReaderImpl.hpp,v $
 * Revision 1.3  2000/08/09 22:16:13  jpolast
 * many conformance & stability changes:
 *   - ContentHandler::resetDocument() removed
 *   - attrs param of ContentHandler::startDocument() made const
 *   - SAXExceptions thrown now have msgs
 *   - removed duplicate function signatures that had 'const'
 *       [ eg: getContentHander() ]
 *   - changed getFeature and getProperty to apply to const objs
 *   - setProperty now takes a void* instead of const void*
 *   - SAX2XMLReaderImpl does not inherit from SAXParser anymore
 *   - Reuse Validator (http://apache.org/xml/features/reuse-validator) implemented
 *   - Features & Properties now read-only during parse
 *
 * Revision 1.2  2000/08/02 20:46:32  aruna1
 * sax2 changes
 *
 * Revision 1.1  2000/08/02 18:04:41  jpolast
 * initial checkin of sax2 implemenation
 * submitted by Simon Fell (simon@fell.com)
 * and Joe Polastre (jpolast@apache.org)
 *
 *
 */

#if !defined(SAX2XMLReaderImpl_HPP)
#define SAX2XMLReaderImpl_HPP

#include <parsers/SAXParser.hpp>
#include <sax/Parser.hpp>
#include <framework/XMLBuffer.hpp>
#include <internal/VecAttributesImpl.hpp>
#include <sax2/SAX2XMLReader.hpp>
#include <util/RefStackOf.hpp>
#include <util/ValueStackOf.hpp>
#include <framework/XMLBufferMgr.hpp>

class ContentHandler;

/**
  * This class implements the SAX2 'XMLReader' interface and should be
  * used by applications wishing to parse the XML files using SAX2.
  * It allows the client program to install SAX2 handlers for event
  * callbacks.
  *
  * <p>It can be used to instantiate a validating or non-validating
  * parser, by setting a member flag.</p>
  *
  * we basically re-use the existing SAX1 parser code, but provide a 
  * new implementation of XMLContentHandler that raises the new
  * SAX2 style events
  *
  */

class PARSERS_EXPORT SAX2XMLReaderImpl :
	public SAX2XMLReader
//    , public Parser
    , public XMLDocumentHandler
    , public XMLErrorReporter
    , public XMLEntityHandler
    , public DocTypeHandler
{
public :

	static const XMLCh SAX_CORE_VALIDATION[];
	static const XMLCh SAX_CORE_NAMESPACES[];
	static const XMLCh SAX_CORE_NAMESPACES_PREFIXES[];
	static const XMLCh SAX_XERCES_DYNAMIC[];
	static const XMLCh SAX_XERCES_REUSEVALIDATOR[];
	
	SAX2XMLReaderImpl() ;
	~SAX2XMLReaderImpl() ;

	// -----------------------------------------------------------------------
    //  Implementation of the XMLDocumentHandler interface
    // -----------------------------------------------------------------------

    /** @name Implementation of the XMLDocumentHandler Interface. */
    //@{
    /**
      * This method is used to report all the characters scanned
      * by the parser. The driver will invoke the 'characters'
      * method of the user installed SAX Document Handler.
      *
      * <p>If any advanced callback handlers are installed, the
      * corresponding 'docCharacters' method will also be invoked.</p>
      *
      * @param chars   A const pointer to a Unicode string representing the
      *                character data.
      * @param length  The length of the Unicode string returned in 'chars'.
      * @param cdataSection  A flag indicating if the characters represent
      *                      content from the CDATA section.
      * @see DocumentHandler#characters
      */
    virtual void docCharacters
    (
        const   XMLCh* const    chars
        , const unsigned int    length
        , const bool            cdataSection
    );

    /**
      * This method is used to report any comments scanned by the parser.
      * This method is a no-op unless, unless an advanced callback handler
      * is installed, in which case the corresponding 'docComment' method
      * is invoked.
      *
      * @param comment A const pointer to a null terminated Unicode
      *                string representing the comment text.
      */
    virtual void docComment
    (
        const   XMLCh* const    comment
    );

    /**
      * This method is used to report any PI scanned by the parser.
      *
      * <p>Any PI's occurring before any 'content' are not reported
      * to any SAX handler as per the specification. However, all
      * PI's within content are reported via the SAX Document Handler's
      * 'processingInstruction' method.
      *
      * <p>If any advanced callback handlers are installed, the
      * corresponding 'docPI' method will be invoked.</p>
      *
      * @param target A const pointer to a Unicode string representing the
      *               target of the PI declaration.
      * @param data   A const pointer to a Unicode string representing the
      *               data of the PI declaration. See the PI production rule
      *               in the XML specification for details.
      *
      * @see DocumentHandler#processingInstruction
      */
    virtual void docPI
    (
        const   XMLCh* const    target
        , const XMLCh* const    data
    );

    /**
      * This method is used to indicate the end of root element
      * was just scanned by the parser. Corresponding 'endDocument'
      * method of the user installed SAX Document Handler will also
      * be invoked.
      *
      * <p>In addition, if any advanced callback handlers are installed,
      * the corresponding 'endDocument' method is invoked.</p>
      *
      * @see DocumentHandler#endDocument
      */
    virtual void endDocument();

    /**
      * This method is used to indicate the end tag of an element.
      * The driver will invoke the corresponding 'endElement' method of
      * the SAX Document Handler interface.
      *
      * <p>If any advanced callback handlers are installed, the
      * corresponding 'endElement' method is also invoked.</p>
      *
      * @param elemDecl A const reference to the object containing element
      *                 declaration information.
      * @param urlId    An id referring to the namespace prefix, if
      *                 namespaces setting is switched on.
      * @param isRoot   A flag indicating whether this element was the
      *                 root element.
      * @see DocumentHandler#endElement
      */
    virtual void endElement
    (
        const   XMLElementDecl& elemDecl
        , const unsigned int    urlId
        , const bool            isRoot
    );

    /**
      * This method is used to indicate that an end of an entity reference
      * was just scanned.
      *
      * <p>If any advanced callback handlers are installed, the
      * corresponding 'endEnityReference' method is invoked.</p>
      *
      * @param entDecl A const reference to the object containing the
      *                entity declaration information.
      */
    virtual void endEntityReference
    (
        const   XMLEntityDecl&  entDecl
    );

    /**
      * This method is used to report all the whitespace characters,
      * which are determined to be 'ignorable'. This distinction
      * between characters is only made, if validation is enabled.
      * Corresponding 'ignorableWhitespace' method of the user installed
      * SAX Document Handler interface is called.
      *
      * <p>Any whitespace before content is not reported to the SAX
      * Document Handler method, as per the SAX specification.
      * However, if any advanced callback handlers are installed, the
      * corresponding 'ignorableWhitespace' method is invoked.</p>
      *
      * @param chars   A const pointer to a Unicode string representing the
      *                ignorable whitespace character data.
      * @param length  The length of the Unicode string 'chars'.
      * @param cdataSection  A flag indicating if the characters represent
      *                      content from the CDATA section.
      * @see DocumentHandler#ignorableWhitespace
      */
    virtual void ignorableWhitespace
    (
        const   XMLCh* const    chars
        , const unsigned int    length
        , const bool            cdataSection
    );

    /**
      * This method allows the user installed Document Handler and
      * any advanced callback handlers to 'reset' themselves.
      */
    virtual void resetDocument();

    /**
      * This method is used to report the start of the parsing process.
      * The corresponding user installed SAX Document Handler's method
      * 'startDocument' is invoked.
      * 
      * <p>If any advanced callback handlers are installed, then the
      * corresponding 'startDocument' method is also called.</p>
      *
      * @see DocumentHandler#startDocument
      */
    virtual void startDocument();

    /**
      * This method is used to report the start of an element. It is
      * called at the end of the element, by which time all attributes
      * specified are also parsed. The corresponding user installed
      * SAX Document Handler's method 'startElement' is invoked.
      * 
      * <p>If any advanced callback handlers are installed, then the
      * corresponding 'startElement' method is also called.</p>
      *
      * @param elemDecl A const reference to the object containing element
      *                 declaration information.
      * @param urlId    An id referring to the namespace prefix, if
      *                 namespaces setting is switched on.
      * @param elemPrefix A const pointer to a Unicode string containing
      *                   the namespace prefix for this element. Applicable
      *                   only when namespace processing is enabled.
      * @param attrList  A const reference to the object containing the
      *                  list of attributes just scanned for this element.
      * @param attrCount A count of number of attributes in the list
      *                  specified by the parameter 'attrList'.
      * @param isEmpty  A flag indicating whether this is an empty element
      *                 or not.
      * @param isRoot   A flag indicating whether this element was the
      *                 root element.
      * @see DocumentHandler#startElement
      */
    virtual void startElement
    (
        const   XMLElementDecl&         elemDecl
        , const unsigned int            urlId
        , const XMLCh* const            elemPrefix
        , const RefVectorOf<XMLAttr>&   attrList
        , const unsigned int            attrCount
        , const bool                    isEmpty
        , const bool                    isRoot
    );

    /**
      * This method is used to indicate the start of an entity reference.
      *
      * <p>If any advanced callback handlers are installed, the
      * corresponding 'endEnityReference' method is invoked.</p>
      *
      * @param entDecl A const reference to the object containing the
      *                entity declaration information.
      */
    virtual void startEntityReference
    (
        const   XMLEntityDecl&  entDecl
    );

    /**
      * This method is used to report the XML decl scanned by the parser.
      * Refer to the XML specification to see the meaning of parameters.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      * @param versionStr A const pointer to a Unicode string representing
      *                   version string value.
      * @param encodingStr A const pointer to a Unicode string representing
      *                    the encoding string value.
      * @param standaloneStr A const pointer to a Unicode string
      *                      representing the standalone string value.
      * @param actualEncodingStr A const pointer to a Unicode string
      *                          representing the actual encoding string
      *                          value.
      */
    virtual void XMLDecl
    (
        const   XMLCh* const    versionStr
        , const XMLCh* const    encodingStr
        , const XMLCh* const    standaloneStr
        , const XMLCh* const    actualEncodingStr
    );
    //@}

	// -----------------------------------------------------------------------
    //  Implementation of the XMLReader interface
    // -----------------------------------------------------------------------

    /** @name Getter methods */
    //@{

    /**
      * This method returns the installed content handler. 
      *
      * @return A pointer to the installed content handler object.
      */
    virtual ContentHandler* getContentHandler() const;

    /**
      * This method returns the installed DTD handler. 
      *
      * @return A pointer to the installed DTD handler object.
      */
    virtual DTDHandler* getDTDHandler() const ;

    /**
      * This method returns the installed entity resolver. 
      *
      * @return A pointer to the installed entity resolver object.
      */
    virtual EntityResolver* getEntityResolver() const  ;

    /**
      * This method returns the installed error handler. 
      *
      * @return A pointer to the installed error handler object.
      */
    virtual ErrorHandler* getErrorHandler() const ;

    /** @name Implementation of SAX 2.0 interface's. */
    //@{
    /**
      * This method invokes the parsing process on the XML file specified
      * by the InputSource parameter.
      *
      * @param source A const reference to the InputSource object which
      *               points to the XML file to be parsed.
      */
    virtual void parse(const InputSource& source);

    /**
      * This method invokes the parsing process on the XML file specified by
      * the Unicode string parameter 'systemId'.
      *
      * @param systemId A const XMLCh pointer to the Unicode string which
      *                 contains the path to the XML file to be parsed.
      */
    virtual void parse(const XMLCh* const systemId);

    /**
      * This method invokes the parsing process on the XML file specified by
      * the native char* string parameter 'systemId'.
      *
      * @param systemId A const char pointer to a native string which
      *                 contains the path to the XML file to be parsed.
      */
    virtual void parse(const char* const systemId);

    /**
      * This method installs the user specified SAX Document Handler
      * callback function on parser.
      *
      * @param handler A pointer to the document handler to be called
      *                when the parser comes across 'document' events
      *                as per the SAX specification.
      */
    virtual void setContentHandler(ContentHandler* const handler);

  /**
    * Allow an application to register a DTD event handler.
    *
    * If the application does not register a DTD handler, all DTD
    * events reported by the SAX parser will be silently ignored (this
    * is the default behaviour implemented by HandlerBase).
    *
    * Applications may register a new or different handler in the middle
    * of a parse, and the SAX parser must begin using the new handler
    * immediately.
    *
    * @param handler The DTD handler.
    * @see DTDHandler#DTDHandler
    * @see HandlerBase#HandlerBase
    */
    virtual void setDTDHandler(DTDHandler* const handler) ;

  /**
    * Allow an application to register a custom entity resolver.
    *
    * If the application does not register an entity resolver, the
    * SAX parser will resolve system identifiers and open connections
    * to entities itself (this is the default behaviour implemented in
    * DefaultHandler).
    *
    * Applications may register a new or different entity resolver
    * in the middle of a parse, and the SAX parser must begin using
    * the new resolver immediately.
    *
    * @param resolver The object for resolving entities.
    * @see EntityResolver#EntityResolver
    * @see DefaultHandler#DefaultHandler
    */
    virtual void setEntityResolver(EntityResolver* const resolver) ;
    
  /**
    * Allow an application to register an error event handler.
    *
    * If the application does not register an error event handler,
    * all error events reported by the SAX parser will be silently
    * ignored, except for fatalError, which will throw a SAXException
    * (this is the default behaviour implemented by HandlerBase).
    *
    * Applications may register a new or different handler in the
    * middle of a parse, and the SAX parser must begin using the new
    * handler immediately.
    *
    * @param handler The error handler.
    * @see ErrorHandler#ErrorHandler
    * @see SAXException#SAXException
    * @see HandlerBase#HandlerBase
    */
    virtual void setErrorHandler(ErrorHandler* const handler) ;

	/**
	  * This method sets a Feature as per the SAX2 spec (such as
	  * do validation)
	  *
	  * @param name The name of the feature to be set
	  * @param value true if the feature should be enabled.
	  */
	virtual void setFeature(const XMLCh* const name, const bool value);

	/**
	  * This method gets a Feature as per the SAX2 spec (such as
	  * do validation)
	  *
	  * @param name The name of the feature to be set
	  * @param value true if the feature should be enabled.
	  */
	virtual bool getFeature(const XMLCh* const name) const;

	/**
	  * Set the value of a property.
	  *
	  * @param name The property name, which is any fully-qualified URI.
	  * @param value The requested value for the property.
	  */
	virtual void setProperty(const XMLCh* const name, void* value);

	/**
	  * Gets the value of a property.
	  *
	  * @param name The property name, which is any fully-qualified URI.
	  */
	virtual void* getProperty(const XMLCh* const name) const;
	//@}

    // -----------------------------------------------------------------------
    //  Implementation of the XMLErrorReporter interface
    // -----------------------------------------------------------------------

    /** @name Implementation of the XMLErrorReporter Interface. */
    //@{
    /**
      * This method is used to report back errors found while parsing the
      * XML file. The driver will call the corresponding user installed
      * SAX Error Handler methods: 'fatal', 'error', 'warning' depending
      * on the severity of the error. This classification is defined by
      * the XML specification.
      *
      * @param errCode An integer code for the error.
      * @param msgDomain A const pointer to an Unicode string representing
      *                  the message domain to use.
      * @param errType An enumeration classifying the severity of the error.
      * @param errorText A const pointer to an Unicode string representing
      *                  the text of the error message.
      * @param systemId  A const pointer to an Unicode string representing
      *                  the system id of the XML file where this error
      *                  was discovered.
      * @param publicId  A const pointer to an Unicode string representing
      *                  the public id of the XML file where this error
      *                  was discovered.
      * @param lineNum   The line number where the error occurred.
      * @param colNum    The column number where the error occurred.
      * @see ErrorHandler
      */
    virtual void error
    (
        const   unsigned int                errCode
        , const XMLCh* const                msgDomain
        , const XMLErrorReporter::ErrTypes  errType
        , const XMLCh* const                errorText
        , const XMLCh* const                systemId
        , const XMLCh* const                publicId
        , const unsigned int                lineNum
        , const unsigned int                colNum
    );

    /**
      * This method allows the user installed Error Handler
      * callback to 'reset' itself.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      */
    virtual void resetErrors();
    //@}


    // -----------------------------------------------------------------------
    //  Implementation of the XMLEntityHandler interface
    // -----------------------------------------------------------------------

    /** @name Implementation of the XMLEntityHandler Interface. */
    //@{
    /**
      * This method is used to indicate the end of parsing of an external
      * entity file.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      * @param inputSource A const reference to the InputSource object
      *                    which points to the XML file being parsed.
      * @see InputSource
      */
    virtual void endInputSource(const InputSource& inputSource);

    /**
      * This method allows an installed XMLEntityHandler to further
      * process any system id's of enternal entities encountered in
      * the XML file being parsed, such as redirection etc.
      *
      * <b><font color="#FF0000">This method always returns 'false'
      * for this SAX driver implementation.</font></b>
      *
      * @param systemId  A const pointer to an Unicode string representing
      *                  the system id scanned by the parser.
      * @param toFill    A pointer to a buffer in which the application
      *                  processed system id is stored.
      * @return 'true', if any processing is done, 'false' otherwise. 
      */
    virtual bool expandSystemId
    (
        const   XMLCh* const    systemId
        ,       XMLBuffer&      toFill
    );

    /**
      * This method allows the installed XMLEntityHandler to reset
      * itself.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      */
    virtual void resetEntities();

    /**
      * This method allows a user installed entity handler to further
      * process any pointers to external entities. The applications
      * can implement 'redirection' via this callback. The driver
      * should call the SAX EntityHandler 'resolveEntity' method.
      *
      * @param publicId A const pointer to a Unicode string representing the
      *                 public id of the entity just parsed.
      * @param systemId A const pointer to a Unicode string representing the
      *                 system id of the entity just parsed.
      * @return The value returned by the SAX resolveEntity method or
      *         NULL otherwise to indicate no processing was done.
      * @see EntityResolver
      */
    virtual InputSource* resolveEntity
    (
        const   XMLCh* const    publicId
        , const XMLCh* const    systemId
    );

    /**
      * This method is used to indicate the start of parsing an
      * external entity file.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      * @param inputSource A const reference to the InputSource object
      *                    which points to the external entity 
      *                    being parsed.
      */
    virtual void startInputSource(const InputSource& inputSource);
    //@}

    // -----------------------------------------------------------------------
    //  Implementation of the DocTypeHandler Interface
    // -----------------------------------------------------------------------

    /** @name Implementation of the DocTypeHandler Interface */
    //@{
    /**
      * This method is used to report an attribute definition.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX
      * driver implementation.</font></b>
      *
      * @param elemDecl A const reference to the object containing information
      *                 about the element whose attribute definition was just
      *                 parsed.
      * @param attDef   A const reference to the object containing information
      *                 attribute definition.
      * @param ignore   The flag indicating whether this attribute definition
      *                 was ignored by the parser or not.
      */
    virtual void attDef
    (
        const   DTDElementDecl& elemDecl
        , const DTDAttDef&      attDef
        , const bool            ignoring
    );

    /**
      * This method is used to report a comment occurring within the DTD.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      * @param comment  A const pointer to a Unicode string representing the
      *                 text of the comment just parsed.
      */
    virtual void doctypeComment
    (
        const   XMLCh* const    comment
    );

    /**
      * This method is used to report the DOCTYPE declaration.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      * @param elemDecl A const reference to the object containing information
      *                 about the root element definition declaration of the
      *                 XML document being parsed.
      * @param publicId A const pointer to a Unicode string representing the
      *                 public id of the DTD file.
      * @param systemId A const pointer to a Unicode string representing the
      *                 system id of the DTD file.
      * @param hasIntSubset A flag indicating if this XML file contains any
      *                     internal subset.
      */
    virtual void doctypeDecl
    (
        const   DTDElementDecl& elemDecl
        , const XMLCh* const    publicId
        , const XMLCh* const    systemId
        , const bool            hasIntSubset
    );

    /**
      * This method is used to report any PI declarations
      * occurring inside the DTD definition block.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      * @param target A const pointer to a Unicode string representing the
      *               target of the PI declaration.
      * @param data   A const pointer to a Unicode string representing the
      *               data of the PI declaration. See the PI production rule
      *               in the XML specification for details.
      */
    virtual void doctypePI
    (
        const   XMLCh* const    target
        , const XMLCh* const    data
    );

    /**
      * This method is used to report any whitespaces
      * occurring inside the DTD definition block.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      * @param chars  A const pointer to a Unicode string representing the
      *               whitespace characters.
      * @param length The length of the whitespace Unicode string.
      */
    virtual void doctypeWhitespace
    (
        const   XMLCh* const    chars
        , const unsigned int    length
    );

    /**
      * This method is used to report an element declarations
      * successfully scanned by the parser.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      * @param decl   A const reference to the object containing element
      *               declaration information.
      * @param isIgnored The flag indicating whether this definition was
      *                  ignored by the parser or not.
      */
    virtual void elementDecl
    (
        const   DTDElementDecl& decl
        , const bool            isIgnored
    );

    /**
      * This method is used to report the end of an attribute
      * list declaration for an element.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      * @param elemDecl A const reference to the object containing element
      *                 declaration information.
      */
    virtual void endAttList
    (
        const   DTDElementDecl& elemDecl
    );

    /**
      * This method is used to report the end of the internal subset.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      */
    virtual void endIntSubset();

    /**
      * This method is used to report the end of the external subset.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      */
    virtual void endExtSubset();

    /**
      * This method is used to report any entity declarations.
      * For unparsed entities, this driver will invoke the
      * SAX DTDHandler::unparsedEntityDecl callback.
      *
      * @param entityDecl A const reference to the object containing
      *                   the entity declaration information.
      * @param isPEDecl  The flag indicating whether this was a
      *                  parameter entity declaration or not.
      * @param isIgnored The flag indicating whether this definition
      *                  was ignored by the parser or not.
      *
      * @see DTDHandler#unparsedEntityDecl
      */
    virtual void entityDecl
    (
        const   DTDEntityDecl&  entityDecl
        , const bool            isPEDecl
        , const bool            isIgnored
    );

    /**
      * This method allows the user installed DTD handler to
      * reset itself.
      */
    virtual void resetDocType();

    /**
      * This method is used to report any notation declarations.
      * If there is a user installed DTDHandler, then the driver will
      * invoke the SAX DTDHandler::notationDecl callback.
      *
      * @param notDecl A const reference to the object containing the notation
      *                declaration information.
      * @param isIgnored The flag indicating whether this definition was ignored
      *                  by the parser or not.
      *
      * @see DTDHandler#notationDecl
      */
    virtual void notationDecl
    (
        const   XMLNotationDecl&    notDecl
        , const bool                isIgnored
    );

    /**
      * This method is used to indicate the start of an element's attribute
      * list declaration.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      * @param elemDecl A const reference to the object containing element
      *                 declaration information.
      */
    virtual void startAttList
    (
        const   DTDElementDecl& elemDecl
    );

    /**
      * This method is used indicate the start of the internal subset.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      */
    virtual void startIntSubset();

    /**
      * This method is used indicate the start of the external subset.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      */
    virtual void startExtSubset();

    /**
      * This method is used to report the TextDecl. Refer to the XML
      * specification for the syntax of a TextDecl.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      * @param versionStr A const pointer to a Unicode string representing
      *                   the version number of the 'version' clause.
      * @param encodingStr A const pointer to a Unicode string representing
      *                    the encoding name of the 'encoding' clause.
      */
    virtual void TextDecl
    (
        const   XMLCh* const    versionStr
        , const XMLCh* const    encodingStr
    );
    //@}

    // -----------------------------------------------------------------------
    //  Validator: setters and getters
    // -----------------------------------------------------------------------
    /** @name Validator: setters and getters (Xerces-C specific) */
    //@{
    /**
	  * This method is used to set a validator.
	  *
	  * <b>SAX2XMLReader assumes responsibility for the validator.  It will be
	  * deleted when the XMLReader is destroyed.</b>
	  *
	  * @param valueToAdopt A pointer to the validator that the reader should use.
	  *
	  */
	virtual void setValidator(XMLValidator* valueToAdopt);

    /**
	  * This method is used to get the current validator.
	  *
	  * <b>SAX2XMLReader assumes responsibility for the validator.  It will be
	  * deleted when the XMLReader is destroyed.</b>
	  *
	  * @return A pointer to the validator.  An application should not deleted
	  * the object returned.
	  *
	  */
	virtual XMLValidator* getValidator() const;
    //@}

private :
    // -----------------------------------------------------------------------
    //  Unimplemented constructors and operators
    // -----------------------------------------------------------------------
    SAX2XMLReaderImpl(const SAX2XMLReaderImpl&);
    void operator=(const SAX2XMLReaderImpl&);

    // -----------------------------------------------------------------------
    //  Private data members
    //
    //  fAttrList
    //      A temporary implementation of the basic SAX2 Attributes
    //      interface. We use this one over and over on each startElement
    //      event to allow SAX-like access to the element attributes.
    //
    //  fDocHandler
    //      The installed SAX content handler, if any. Null if none.
    //
	//  fnamespacePrefix
	//      Indicates whether the namespace-prefix feature is on or off.
	//  
	//  fautoValidation
	//      Indicates whether automatic validation is on or off
	//
	//  fValidation
	//      Indicates whether the 'validation' core features is on or off
	//
	//  freuseValidator
	//      Tells the parser whether it should reuse the validator or not
	//
	//	fStringBuffers
	//		Any temporary strings we need are pulled out of this pool
	//
	//	fPrefixes 
	//		A Stack of the current namespace prefixes that need calls to
	//		endPrefixMapping
	//
	//	fPrefixCounts
	//		A Stack of the number of prefixes that need endPrefixMapping
	//		calls for that element
    // -----------------------------------------------------------------------
	VecAttributesImpl		   fAttrList ;
	ContentHandler*			   fDocHandler ;
	RefVectorOf<XMLAttr>*      tempAttrVec ;

	bool                       fnamespacePrefix;
	bool                       fautoValidation;
	bool                       fValidation;
	bool                       freuseValidator;

	XMLBufferMgr			   fStringBuffers ;
	RefStackOf<XMLBuffer> *    fPrefixes ;
	ValueStackOf<unsigned int> * prefixCounts ;

    DTDHandler*                fDTDHandler;
    unsigned int               fElemDepth;
    EntityResolver*            fEntityResolver;
    ErrorHandler*              fErrorHandler;
    unsigned int               fAdvDHCount;
    XMLDocumentHandler**       fAdvDHList;
    unsigned int               fAdvDHListSize;
    bool                       fParseInProgress;
    XMLScanner*                fScanner;
    XMLValidator*              fValidator;
	
	// internal function used to set the state of validation: always, never, or auto
	void setValidationScheme(const ValSchemes newScheme);
    void setDoNamespaces(const bool newState);
    bool getDoNamespaces() const;

};


// ---------------------------------------------------------------------------
//  SAX2XMLReader: Getter methods
// ---------------------------------------------------------------------------
inline ContentHandler* SAX2XMLReaderImpl::getContentHandler() const
{
    return fDocHandler;
}

inline DTDHandler* SAX2XMLReaderImpl::getDTDHandler() const 
{
	return fDTDHandler ;
}

inline EntityResolver* SAX2XMLReaderImpl::getEntityResolver() const  
{
	return fEntityResolver;
}

inline ErrorHandler* SAX2XMLReaderImpl::getErrorHandler() const
{
	return fErrorHandler;
}

inline XMLValidator* SAX2XMLReaderImpl::getValidator() const
{
	return fValidator;
}

#endif 
