contenthandler.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) 1999-2000 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
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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,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * 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: ContentHandler.hpp,v $
 * Revision 1.3  2003/03/07 18:10:30  tng
 * Return a reference instead of void for operator=
 *
 * Revision 1.2  2002/11/04 14:55:45  tng
 * C++ Namespace Support.
 *
 * Revision 1.1.1.1  2002/02/01 22:22:09  peiyongz
 * sane_include
 *
 * Revision 1.4  2000/12/14 18:50:05  tng
 * Fix API document generation warning: "Warning: end of member group without matching begin"
 *
 * 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 18:02:34  jpolast
 * initial checkin of sax2 implementation
 * submitted by Simon Fell ([e-mail])
 * and Joe Polastre ([e-mail])
 *
 *
 */


#ifndef CONTENTHANDLER_HPP
#define CONTENTHANDLER_HPP

#include <xercesc/util/XercesDefs.hpp>

XERCES_CPP_NAMESPACE_BEGIN

class Attributes;
class Locator;

/**
  * Receive notification of general document events.
  *
  * <p>This is the main interface that most SAX2 applications
  * implement: if the application needs to be informed of basic parsing
  * events, it implements this interface and registers an instance with
  * the SAX2 parser using the setDocumentHandler method.  The parser
  * uses the instance to report basic document-related events like
  * the start and end of elements and character data.</p>
  *
  * <p>The order of events in this interface is very important, and
  * mirrors the order of information in the document itself.  For
  * example, all of an element's content (character data, processing
  * instructions, and/or subelements) will appear, in order, between
  * the startElement event and the corresponding endElement event.</p>
  *
  * <p>Application writers who do not want to implement the entire
  * interface while can derive a class from Sax2HandlerBase, which implements
  * the default functionality; parser writers can instantiate
  * Sax2HandlerBase to obtain a default handler.  The application can find
  * the location of any document event using the Locator interface
  * supplied by the Parser through the setDocumentLocator method.</p>
  *
  * @see Parser#setDocumentHandler
  * @see Locator#Locator
  * @see Sax2HandlerBase#Sax2HandlerBase
  */

class SAX2_EXPORT ContentHandler
{
public:
    /** @name Constructors and Destructor */
    //@{
    /** Default constructor */
    ContentHandler()
    {
    }

    /** Destructor */
    virtual ~ContentHandler()
    {
    }
    //@}

    /** @name The virtual document handler interface */

    //@{
   /**
    * Receive notification of character data.
    *
    * <p>The Parser will call this method to report each chunk of
    * character data.  SAX parsers may return all contiguous character
    * data in a single chunk, or they may split it into several
    * chunks; however, all of the characters in any single event
    * must come from the same external entity, so that the Locator
    * provides useful information.</p>
    *
    * <p>The application must not attempt to read from the array
    * outside of the specified range.</p>
    *
    * <p>Note that some parsers will report whitespace using the
    * ignorableWhitespace() method rather than this one (validating
    * parsers must do so).</p>
    *
    * @param chars The characters from the XML document.
    * @param length The number of characters to read from the array.
    * @exception SAXException Any SAX exception, possibly
    *            wrapping another exception.
    * @see #ignorableWhitespace
    * @see Locator#Locator
    */
    virtual void characters
    (
        const   XMLCh* const    chars
        , const unsigned int    length
    ) = 0;

  /**
    * Receive notification of the end of a document.
    *
    * <p>The SAX parser will invoke this method only once, and it will
    * be the last method invoked during the parse.  The parser shall
    * not invoke this method until it has either abandoned parsing
    * (because of an unrecoverable error) or reached the end of
    * input.</p>
    *
    * @exception SAXException Any SAX exception, possibly
    *            wrapping another exception.
    */
    virtual void endDocument () = 0;

  /**
    * Receive notification of the end of an element.
    *
    * <p>The SAX parser will invoke this method at the end of every
    * element in the XML document; there will be a corresponding
    * startElement() event for every endElement() event (even when the
    * element is empty).</p>
    *
    * @param uri The URI of the asscioated namespace for this element
	* @param localname The local part of the element name
	* @param qname The QName of this element
    * @exception SAXException Any SAX exception, possibly