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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * $Id: Parser.hpp 568078 2007-08-21 11:43:25Z amassari $
 */

#ifndef PARSER_HPP
#define PARSER_HPP

#include <xercesc/util/XercesDefs.hpp>

XERCES_CPP_NAMESPACE_BEGIN

class DTDHandler;
class EntityResolver;
class DocumentHandler;
class ErrorHandler;
class InputSource;

/**
  * Basic interface for SAX (Simple API for XML) parsers.
  *
  * All SAX parsers must implement this basic interface: it allows
  * applications to register handlers for different types of events
  * and to initiate a parse from a URI, or a character stream.
  *
  * All SAX parsers must also implement a zero-argument constructor
  * (though other constructors are also allowed).
  *
  * SAX parsers are reusable but not re-entrant: the application
  * may reuse a parser object (possibly with a different input source)
  * once the first parse has completed successfully, but it may not
  * invoke the parse() methods recursively within a parse.
  *
  * @see EntityResolver#EntityResolver
  * @see DTDHandler#DTDHandler
  * @see DocumentHandler#DocumentHandler
  * @see ErrorHandler#ErrorHandler
  * @see HandlerBase#HandlerBase
  * @see InputSource#InputSource
  */

#include <xercesc/util/XercesDefs.hpp>

class SAX_EXPORT Parser
{
public:
    /** @name Constructors and Destructor */
    // -----------------------------------------------------------------------
    //  Constructors and Destructor
    // -----------------------------------------------------------------------
    //@{
    /** The default constructor */
    Parser()
    {
    }
    /** The destructor */
    virtual ~Parser()
    {
    }
    //@}

    //-----------------------------------------------------------------------
    // The parser interface
    //-----------------------------------------------------------------------
    /** @name The parser interfaces */
    //@{
  /**
    * 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
    * HandlerBase).
    *
    * 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 HandlerBase#HandlerBase
    */
    virtual void setEntityResolver(EntityResolver* const resolver) = 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 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 setDocumentHandler(DocumentHandler* const handler) = 0;

  /**
    * 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) = 0;

  /**
    * Parse an XML document.
    *
    * The application can use this method to instruct the SAX parser
    * to begin parsing an XML document from any valid input
    * source (a character stream, a byte stream, or a URI).
    *
    * Applications may not invoke this method while a parse is in
    * progress (they should create a new Parser instead for each
    * additional XML document).  Once a parse is complete, an
    * application may reuse the same Parser object, possibly with a
    * different input source.
    *
    * @param source The input source for the top-level of the
    *               XML document.
    * @exception SAXException Any SAX exception, possibly
    *            wrapping another exception.
    * @exception XMLException An exception from the parser or client
    *            handler code.
    * @see InputSource#InputSource
    * @see #setEntityResolver
    * @see #setDTDHandler
    * @see #setDocumentHandler
    * @see #setErrorHandler
    */
    virtual void parse
    (
        const   InputSource&    source
    ) = 0;

  /**
    * Parse an XML document from a system identifier (URI).
    *
    * This method is a shortcut for the common case of reading a
    * document from a system identifier.  It is the exact equivalent
    * of the following:
    *
    * parse(new URLInputSource(systemId));
    *
    * If the system identifier is a URL, it must be fully resolved
    * by the application before it is passed to the parser.
    *
    * @param systemId The system identifier (URI).
    * @exception SAXException Any SAX exception, possibly
    *            wrapping another exception.
    * @exception XMLException An exception from the parser or client
    *            handler code.
    * @see #parse(InputSource)
    */
    virtual void parse
    (
        const   XMLCh* const    systemId
    ) = 0;

  /**
    * Parse an XML document from a system identifier (URI).
    *
    * This method is a shortcut for the common case of reading a
    * document from a system identifier.  It is the exact equivalent
    * of the following:
    *
    * parse(new URLInputSource(systemId));
    *
    * If the system identifier is a URL, it must be fully resolved
    * by the application before it is passed to the parser.
    *
    * @param systemId The system identifier (URI).
    * @exception SAXException Any SAX exception, possibly
    *            wrapping another exception.
    * @exception XMLException An exception from the parser or client
    *            handler code.
    * @see #parse(InputSource)
    */
    virtual void parse
    (
        const   char* const     systemId
    ) = 0;
    //@}


private :
    /* The copy constructor, you cannot call this directly */
    Parser(const Parser&);

    /* The assignment operator, you cannot call this directly */
    Parser& operator=(const Parser&);
};

XERCES_CPP_NAMESPACE_END

#endif