sax2xmlreaderimpl.hpp

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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: SAX2XMLReaderImpl.hpp 569031 2007-08-23 15:05:28Z amassari $
 */

#if !defined(SAX2XMLReaderImpl_HPP)
#define SAX2XMLReaderImpl_HPP

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

XERCES_CPP_NAMESPACE_BEGIN


class ContentHandler;
class LexicalHandler;
class DeclHandler;
class GrammarResolver;
class XMLGrammarPool;
class XMLResourceIdentifier;
class PSVIHandler;

/**
  * 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 XMemory
    , public SAX2XMLReader
    , public XMLDocumentHandler
    , public XMLErrorReporter
    , public XMLEntityHandler
    , public DocTypeHandler
{
public :
    // -----------------------------------------------------------------------
    //  Constructors and Destructor
    // -----------------------------------------------------------------------
    /** @name Constructors and Destructor */
    //@{
    /** The default constructor */
	SAX2XMLReaderImpl(
                            MemoryManager* const  manager = XMLPlatformUtils::fgMemoryManager
                          , XMLGrammarPool* const gramPool = 0 
                          );

    /** The destructor */	
	~SAX2XMLReaderImpl() ;
   //@}

    //-----------------------------------------------------------------------
    // Implementation of SAX2XMLReader Interface
    //-----------------------------------------------------------------------
    //-----------------------------------------------------------------------
    // 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 ;

    /**
      * 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 entity resolver.
      *
      * @return A pointer to the installed entity resolver object.
      */
    virtual XMLEntityResolver* getXMLEntityResolver() const ;

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

    /**
      * This method returns the installed PSVI handler.
      *
      * @return A pointer to the installed PSVI handler object.
      */
    virtual PSVIHandler* getPSVIHandler() const ;

	/**
     * 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 ;

	/**
     * 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://xerces.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 ;

  /**
    * 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) ;

  /**
    * 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.
    *
    * <i>Any previously set entity resolver is merely dropped, since the parser
    * does not own them.  If both setEntityResolver and setXMLEntityResolver
    * are called, then the last one is used.</i>
    *
    * @param resolver The object for resolving entities.
    * @see EntityResolver#EntityResolver
    * @see DefaultHandler#DefaultHandler
    */
    virtual void setEntityResolver(EntityResolver* const resolver) ;
    
  /** Set the entity resolver
    *
    * This method allows applications to install their own entity
    * resolver. By installing an entity resolver, the applications
    * can trap and potentially redirect references to external
    * entities.
    *
    * <i>Any previously set entity resolver is merely dropped, since the parser
    * does not own them.  If both setEntityResolver and setXMLEntityResolver
    * are called, then the last one is used.</i>
    *
    * @param resolver  A const pointer to the user supplied entity
    *                  resolver.
    *
    * @see #getXMLEntityResolver
    */
    virtual void setXMLEntityResolver(XMLEntityResolver* 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 installs the user specified PSVI handler on
    * the parser.
    *
    * @param handler A pointer to the PSVI handler to be called
    *                when the parser comes across 'PSVI' events
    *                as per the schema specification.
    */
    virtual void setPSVIHandler(PSVIHandler* const handler);

  /**
    * Set the state of any feature in a SAX2 XMLReader.
    * Supported features in SAX2 for xerces-c are:
    * <br>(See http://xerces.apache.org/xerces-c/program-sax2.html#SAX2Features for detail description).
    *
    * <br>http://xml.org/sax/features/validation (default: false)
    * <br>http://xml.org/sax/features/namespaces (default: true)
    * <br>http://xml.org/sax/features/namespace-prefixes (default: false)
    * <br>http://apache.org/xml/features/validation/dynamic (default: false)
    * <br>http://apache.org/xml/features/validation/reuse-grammar (default: false)
    * <br>http://apache.org/xml/features/validation/schema (default: true)
    * <br>http://apache.org/xml/features/validation/schema-full-checking (default: false)
    * <br>http://apache.org/xml/features/nonvalidating/load-external-dtd (default: true)
    * <br>http://apache.org/xml/features/continue-after-fatal-error (default: false)
    * <br>http://apache.org/xml/features/validation-error-as-fatal (default: false)
    * <br>http://apache.org/xml/features/validation/reuse-validator (Deprecated) (default: false)
    *
    * @param name The unique identifier (URI) of the feature.
    * @param value The requested state of the feature (true or false).
    * @exception SAXNotRecognizedException If the requested feature is not known.
    * @exception SAXNotSupportedException Feature modification is not supported during parse
    *
    */
	virtual void setFeature(const XMLCh* const name, const bool value) ;

  /**
    * Set the value of any property in a SAX2 XMLReader.
    * Supported properties in SAX2 for xerces-c are:
    * <br>(See http://xerces.apache.org/xerces-c/program-sax2.html#SAX2Properties for detail description).
    *
    * <br>http://apache.org/xml/properties/schema/external-schemaLocation
    * <br>http://apache.org/xml/properties/schema/external-noNamespaceSchemaLocation.
    *
    * It takes a void pointer as the property value.  Application is required to initialize this void
    * pointer to a correct type.  See http://xerces.apache.org/xerces-c/program-sax2.html#SAX2Properties
    * to learn exactly what type of property value each property expects for processing.
    * Passing a void pointer that was initialized with a wrong type will lead to unexpected result.
    * If the same property is set more than once, the last one takes effect.
    *
    * @param name The unique identifier (URI) of the property being set.
    * @param value The requested value for the property.  See
    *            http://xerces.apache.org/xerces-c/program-sax2.html#SAX2Properties to learn
    *            exactly what type of property value each property expects for processing.
    *            Passing a void pointer that was initialized with a wrong type will lead
    *            to unexpected result.
    * @exception SAXNotRecognizedException If the requested property is not known.
    * @exception SAXNotSupportedException Property modification is not supported during parse
    */
	virtual void setProperty(const XMLCh* const name, void* value) ;

  /**
    * 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