sax2xmlreader.hpp

基于属性证书的访问控制源代码,由c++编写,包括openssl,xercesc等

/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999-2001 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.
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 * 5. Products derived from this software may not be called "Apache",
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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/>.
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/*
 * $Log: SAX2XMLReader.hpp,v $
 * Revision 1.10  2003/03/07 18:10:30  tng
 * Return a reference instead of void for operator=
 *
 * Revision 1.9  2003/01/09 19:07:27  tng
 * [Bug 15802] Add "const" qualifier to getURIText.
 *
 * Revision 1.8  2002/12/23 15:23:18  knoaman
 * Added a public api to various parsers to return the src offset within the input
 * source.
 *
 * Revision 1.7  2002/11/04 14:55:45  tng
 * C++ Namespace Support.
 *
 * Revision 1.6  2002/07/11 18:29:09  knoaman
 * Grammar caching/preparsing - initial implementation.
 *
 * Revision 1.5  2002/07/04 15:35:44  tng
 * API Documentation typo fix.
 *
 * Revision 1.4  2002/06/27 18:46:53  tng
 * API Documentation Update.
 *
 * Revision 1.3  2002/06/17 15:39:49  tng
 * To be consistent, SAX2 is updated with:
 * 1. the progressive parse methods should use the fReuseGrammar flag set from setFeature instead of using parameter
 * 2. add feature "http://apache.org/xml/features/continue-after-fatal-error", and users should use setFeature instead of setExitOnFirstFatalError
 * 3. add feature "http://apache.org/xml/features/validation-error-as-fatal", and users should use setFeature instead of setValidationConstraintFatal
 *
 * Revision 1.2  2002/05/30 16:22:53  tng
 * Add feature to optionally ignore external DTD.
 *
 * Revision 1.1.1.1  2002/02/01 22:22:09  peiyongz
 * sane_include
 *
 * Revision 1.18  2002/01/28 18:45:40  knoaman
 * Update documentation for SAX2 feature 'namespace-prefixes'.
 *
 * Revision 1.17  2002/01/28 17:08:33  knoaman
 * SAX2-ext's DeclHandler support.
 *
 * Revision 1.16  2002/01/18 16:31:26  tng
 * Break program.xml which takes too long to load, into program-sax.xml, program-sax2.xml, program-dom.xml, program-idom.xml.
 *
 * Revision 1.15  2002/01/02 15:36:54  tng
 * Some documentation update.
 *
 * Revision 1.14  2001/11/20 18:51:44  tng
 * Schema: schemaLocation and noNamespaceSchemaLocation to be specified outside the instance document.  New methods setExternalSchemaLocation and setExternalNoNamespaceSchemaLocation are added (for SAX2, two new properties are added).
 *
 * Revision 1.13  2001/11/14 14:15:59  tng
 * Update SAX2 feature documentation.
 *
 * Revision 1.12  2001/09/12 13:03:43  tng
 * [Bug 3155] SAX2 does not offer progressive parse.
 *
 * Revision 1.11  2001/08/01 19:11:02  tng
 * Add full schema constraint checking flag to the samples and the parser.
 *
 * Revision 1.10  2001/06/27 17:40:16  knoaman
 * Fix for bug #2353.
 *
 * Revision 1.9  2001/06/19 16:44:31  tng
 * Add installAdvDocHandler to SAX2XMLReader as the code is there already.
 *
 * Revision 1.8  2001/06/04 21:03:07  jberry
 * Add pure virtual getErrorCount to SAX2XMLReader interface.
 *
 * Revision 1.7  2001/05/11 13:26:25  tng
 * Copyright update.
 *
 * Revision 1.6  2001/02/15 15:56:31  tng
 * Schema: Add setSchemaValidation and getSchemaValidation for DOMParser and SAXParser.
 * Add feature "http://apache.org/xml/features/validation/schema" for SAX2XMLReader.
 * New data field  fSchemaValidation in XMLScanner as the flag.
 *
 * Revision 1.5  2001/01/12 21:22:00  tng
 * Documentation Enhancement: Add list of SAX2 feature strings that are supported.
 *
 * Revision 1.4  2000/12/22 15:17:04  tng
 * SAX2-ext's LexicalHandler support added by David Bertoni.
 *
 * Revision 1.3  2000/08/09 22:19:29  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  2000/08/07 18:21:27  jpolast
 * change SAX_EXPORT module to SAX2_EXPORT
 *
 * Revision 1.1  2000/08/02 18:02:35  jpolast
 * initial checkin of sax2 implementation
 * submitted by Simon Fell ([e-mail])
 * and Joe Polastre ([e-mail])
 *
 *
 */

#ifndef SAX2XMLReader_HPP
#define SAX2XMLReader_HPP

#include <xercesc/util/XercesDefs.hpp>
#include <xercesc/util/XMLUniDefs.hpp>
#include <xercesc/framework/XMLValidator.hpp>
#include <xercesc/framework/XMLPScanToken.hpp>

XERCES_CPP_NAMESPACE_BEGIN

class ContentHandler ;
class DTDHandler;
class EntityResolver;
class ErrorHandler;
class InputSource;
class LexicalHandler;
class DeclHandler;
class XMLDocumentHandler;
class Grammar;

class SAX2_EXPORT SAX2XMLReader
{
public:
    // -----------------------------------------------------------------------
    //  Class types
    // -----------------------------------------------------------------------
    /** @name Public constants */
    //@{

    /** ValScheme enum used in setValidationScheme
      *    Val_Never:  Do not report validation errors.
      *    Val_Always: The parser will always report validation errors.
      *    Val_Auto:   The parser will report validation errors only if a grammar is specified.
      *
      * @see #setValidationScheme
      */
    enum ValSchemes
    {
        Val_Never
        , Val_Always
        , Val_Auto
    };
    //@}


    // -----------------------------------------------------------------------
    //  Constructors and Destructor
    // -----------------------------------------------------------------------
    /** @name Constructors and Destructor */
    //@{
    /** The default constructor */
    SAX2XMLReader()
    {
    }
    /** The destructor */
    virtual ~SAX2XMLReader()
    {
    }
    //@}

    //-----------------------------------------------------------------------
    // The XMLReader interface
    //-----------------------------------------------------------------------
    /** @name Implementation of SAX 2.0 XMLReader interface's. */
    //@{

    /**
      * This method returns the installed content handler.
      *
      * @return A pointer to the installed content handler object.
      */
    virtual ContentHandler* getContentHandler() const = 0 ;

    /**
      * This method returns the installed DTD handler.
      *
      * @return A pointer to the installed DTD handler object.
      */
    virtual DTDHandler* getDTDHandler() const = 0;

    /**
      * This method returns the installed entity resolver.
      *
      * @return A pointer to the installed entity resolver object.
      */
    virtual EntityResolver* getEntityResolver() const = 0 ;

    /**
      * This method returns the installed error handler.
      *
      * @return A pointer to the installed error handler object.
      */
    virtual ErrorHandler* getErrorHandler() const = 0 ;

	/**
     * Query the current state of any feature in a SAX2 XMLReader.
	  *
	  * @param name The unique identifier (URI) of the feature being set.
	  * @return The current state of the feature.
     * @exception SAXNotRecognizedException If the requested feature is not known.
	  */
	virtual bool getFeature(const XMLCh* const name) const = 0;

	/**
     * Query the current value of a property in a SAX2 XMLReader.
     *
     * The parser owns the returned pointer.  The memory allocated for
     * the returned pointer will be destroyed when the parser is deleted.
     *
     * To ensure assessiblity of the returned information after the parser
     * is deleted, callers need to copy and store the returned information
     * somewhere else; otherwise you may get unexpected result.  Since the returned
     * pointer is a generic void pointer, see
     * http://xml.apache.org/xerces-c/program-sax2.html#SAX2Properties to learn
     * exactly what type of property value each property returns for replication.
     *
     * @param name The unique identifier (URI) of the property being set.
     * @return     The current value of the property.  The pointer spans the same
     *             life-time as the parser.  A null pointer is returned if nothing
     *             was specified externally.
     * @exception  SAXNotRecognizedException If the requested property is not known.
     */
	virtual void* getProperty(const XMLCh* const name) const = 0 ;

  /**
    * Allow an application to register a document event handler.
    *
    * If the application does not register a document handler, all
    * document 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 document handler.
    * @see DocumentHandler#DocumentHandler
    * @see HandlerBase#HandlerBase
    */
    virtual void setContentHandler(ContentHandler* const handler) = 0;

  /**
    * 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) = 0;

  /**
    * 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