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

#if !defined(XercesDOMParser_HPP)
#define XercesDOMParser_HPP


#include <xercesc/parsers/AbstractDOMParser.hpp>

XERCES_CPP_NAMESPACE_BEGIN


class EntityResolver;
class ErrorHandler;
class Grammar;
class XMLEntityResolver;
class XMLResourceIdentifier;

 /**
  * This class implements the Document Object Model (DOM) interface.
  * It should be used by applications which choose to parse and
  * process the XML document using the DOM api's. This implementation
  * also allows the applications to install an error and an entitty
  * handler (useful extensions to the DOM specification).
  *
  * <p>It can be used to instantiate a validating or non-validating
  * parser, by setting a member flag.</p>
  */
class PARSERS_EXPORT XercesDOMParser : public AbstractDOMParser
{
public :
    // -----------------------------------------------------------------------
    //  Constructors and Detructor
    // -----------------------------------------------------------------------

    /** @name Constructors and Destructor */
    //@{
    /** Construct a XercesDOMParser, with an optional validator
      *
      * Constructor with an instance of validator class to use for
      * validation. If you don't provide a validator, a default one will
      * be created for you in the scanner.
      *
      * @param gramPool   Pointer to the grammar pool instance from 
      *                   external application.
      *                   The parser does NOT own it.
      *
      * @param valToAdopt Pointer to the validator instance to use. The
      *                   parser is responsible for freeing the memory.
      * @param  manager   Pointer to the memory manager to be used to
      *                   allocate objects.
      */
    XercesDOMParser
    (
          XMLValidator* const   valToAdopt = 0
        , MemoryManager* const  manager = XMLPlatformUtils::fgMemoryManager
        , XMLGrammarPool* const gramPool = 0        
    );

    /**
      * Destructor
      */
    virtual ~XercesDOMParser();

    //@}


    // -----------------------------------------------------------------------
    //  Getter methods
    // -----------------------------------------------------------------------

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

    /** Get a pointer to the error handler
      *
      * This method returns the installed error handler. If no handler
      * has been installed, then it will be a zero pointer.
      *
      * @return The pointer to the installed error handler object.
      */
    ErrorHandler* getErrorHandler();

    /** Get a const pointer to the error handler
      *
      * This method returns the installed error handler.  If no handler
      * has been installed, then it will be a zero pointer.
      *
      * @return A const pointer to the installed error handler object.
      */
    const ErrorHandler* getErrorHandler() const;

    /** Get a pointer to the entity resolver
      *
      * This method returns the installed entity resolver.  If no resolver
      * has been installed, then it will be a zero pointer.
      *
      * @return The pointer to the installed entity resolver object.
      */
    EntityResolver* getEntityResolver();

    /** Get a const pointer to the entity resolver
      *
      * This method returns the installed entity resolver. If no resolver
      * has been installed, then it will be a zero pointer.
      *
      * @return A const pointer to the installed entity resolver object.
      */
    const EntityResolver* getEntityResolver() const;

    /**
      * Get a pointer to the entity resolver
      *
      * This method returns the installed entity resolver.  If no resolver
      * has been installed, then it will be a zero pointer.
      *
      * @return The pointer to the installed entity resolver object.
      */
    XMLEntityResolver* getXMLEntityResolver();
 
    /**
      * Get a const pointer to the entity resolver
      *
      * This method returns the installed entity resolver. If no resolver
      * has been installed, then it will be a zero pointer.
      *
      * @return A const pointer to the installed entity resolver object.
      */
    const XMLEntityResolver* getXMLEntityResolver() const;

    /** Get the 'Grammar caching' flag
      *
      * This method returns the state of the parser's grammar caching when
      * parsing an XML document.
      *
      * @return true, if the parser is currently configured to
      *         cache grammars, false otherwise.
      *
      * @see #cacheGrammarFromParse
      */
    bool isCachingGrammarFromParse() const;

    /** Get the 'Use cached grammar' flag
      *
      * This method returns the state of the parser's use of cached grammar
      * when parsing an XML document.
      *
      * @return true, if the parser is currently configured to
      *         use cached grammars, false otherwise.
      *
      * @see #useCachedGrammarInParse
      */
    bool isUsingCachedGrammarInParse() const;

    /**
     * Retrieve the grammar that is associated with the specified namespace key
     *
     * @param  nameSpaceKey Namespace key
     * @return Grammar associated with the Namespace key.
     */
    Grammar* getGrammar(const XMLCh* const nameSpaceKey);

    /**
     * Retrieve the grammar where the root element is declared.
     *
     * @return Grammar where root element declared
     */
    Grammar* getRootGrammar();

    /**
     * Returns the string corresponding to a URI id from the URI string pool.
     *
     * @param uriId id of the string in the URI string pool.
     * @return URI string corresponding to the URI id.
     */
    const XMLCh* getURIText(unsigned int uriId) const;

    /**
     * Returns the current src offset within the input source.
     * To be used only while parsing is in progress.
     *
     * @return offset within the input source
     */
    unsigned int getSrcOffset() const;

    /** Get the 'ignore cached DTD grammar' flag
      *    
      * @return true, if the parser is currently configured to
      *         ignore cached DTD, false otherwise.
      *
      * @see #setIgnoreCachedDTD
      */
    bool getIgnoreCachedDTD() const;

    //@}


    // -----------------------------------------------------------------------
    //  Setter methods
    // -----------------------------------------------------------------------

    /** @name Setter methods */
    //@{

    /** Set the error handler
      *
      * This method allows applications to install their own error handler
      * to trap error and warning messages.
      *
      * <i>Any previously set handler is merely dropped, since the parser
      * does not own them.</i>
      *
      * @param handler  A const pointer to the user supplied error
      *                 handler.
      *
      * @see #getErrorHandler
      */
    void setErrorHandler(ErrorHandler* const handler);

    /** 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 handler  A const pointer to the user supplied entity
      *                 resolver.
      *
      * @see #getEntityResolver
      */
    void setEntityResolver(EntityResolver* const handler);

    /**
      * 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 set is used.</i>
      *
      * @param handler  A const pointer to the user supplied entity
      *                 resolver.
      *
      * @see #getXMLEntityResolver
      */
    void setXMLEntityResolver(XMLEntityResolver* const handler);

    /** Set the 'Grammar caching' flag
      *
      * This method allows users to enable or disable caching of grammar when
      * parsing XML documents. When set to true, the parser will cache the
      * resulting grammar for use in subsequent parses.
      *
      * If the flag is set to true, the 'Use cached grammar' flag will also be
      * set to true.
      *
      * The parser's default state is: false.
      *
      * @param newState The value specifying whether we should cache grammars
      *                 or not.
      *
      * @see #isCachingGrammarFromParse
      * @see #useCachedGrammarInParse
      */
    void cacheGrammarFromParse(const bool newState);

    /** Set the 'Use cached grammar' flag
      *
      * This method allows users to enable or disable the use of cached
      * grammars.  When set to true, the parser will use the cached grammar,
      * instead of building the grammar from scratch, to validate XML
      * documents.
      *
      * If the 'Grammar caching' flag is set to true, this mehod ignore the
      * value passed in.
      *
      * The parser's default state is: false.
      *
      * @param newState The value specifying whether we should use the cached
      *                 grammar or not.
      *
      * @see #isUsingCachedGrammarInParse
      * @see #cacheGrammarFromParse
      */
    void useCachedGrammarInParse(const bool newState);

    /** Set the 'ignore cached DTD grammar' flag
      *
      * This method gives users the option to ignore a cached DTD grammar, when
      * an XML document contains both an internal and external DTD, and the use
      * cached grammar from parse option is enabled. Currently, we do not allow
      * using cached DTD grammar when an internal subset is present in the
      * document. This option will only affect the behavior of the parser when
      * an internal and external DTD both exist in a document (i.e. no effect
      * if document has no internal subset).
      *
      * The parser's default state is false
      *
      * @param newValue The state to set
      */
    void setIgnoreCachedDTD(const bool newValue);

    //@}

    // -----------------------------------------------------------------------
    //  Utility methods
    // -----------------------------------------------------------------------

    /** @name Utility methods */
    //@{
    /** Reset the documents vector pool and release all the associated memory
      * back to the system.
      *
      * When parsing a document using a DOM parser, all memory allocated
      * for a DOM tree is associated to the DOM document.
      *
      * If you do multiple parse using the same DOM parser instance, then
      * multiple DOM documents will be generated and saved in a vector pool.
      * All these documents (and thus all the allocated memory)
      * won't be deleted until the parser instance is destroyed.
      *
      * If you don't need these DOM documents anymore and don't want to
      * destroy the DOM parser instance at this moment, then you can call this method
      * to reset the document vector pool and release all the allocated memory
      * back to the system.
      *
      * It is an error to call this method if you are in the middle of a
      * parse (e.g. in the mid of a progressive parse).
      *
      * @exception IOException An exception from the parser if this function
      *            is called when a parse is in progress.
      *
      */
    void resetDocumentPool();

    //@}

    // -----------------------------------------------------------------------