abstractdomparser.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: AbstractDOMParser.hpp 568078 2007-08-21 11:43:25Z amassari $
 *
 */
#if !defined(ABSTRACTDOMPARSER_HPP)
#define ABSTRACTDOMPARSER_HPP

#include <xercesc/dom/DOMDocument.hpp>
#include <xercesc/framework/XMLDocumentHandler.hpp>
#include <xercesc/framework/XMLErrorReporter.hpp>
#include <xercesc/framework/XMLEntityHandler.hpp>
#include <xercesc/util/SecurityManager.hpp>
#include <xercesc/util/ValueStackOf.hpp>
#include <xercesc/validators/DTD/DocTypeHandler.hpp>
#include <xercesc/dom/DOMDocumentType.hpp>
#include <xercesc/validators/DTD/DTDElementDecl.hpp>
#include <xercesc/framework/XMLBufferMgr.hpp>
#include <xercesc/framework/psvi/PSVIHandler.hpp>

XERCES_CPP_NAMESPACE_BEGIN

class XMLPScanToken;
class XMLScanner;
class XMLValidator;
class DOMDocumentImpl;
class DOMDocumentTypeImpl;
class DOMElement;
class GrammarResolver;
class XMLGrammarPool;
class PSVIHandler;

/**
  * This class implements the Document Object Model (DOM) interface.
  * It is used as a base for DOM parsers (i.e. XercesDOMParser, DOMBuilder).
  */
class PARSERS_EXPORT AbstractDOMParser :

    public XMemory
    , public XMLDocumentHandler
    , public XMLErrorReporter
    , public XMLEntityHandler
    , public DocTypeHandler
    , public PSVIHandler
{
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 Detructor
    // -----------------------------------------------------------------------
    /** @name Destructor */
    //@{

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

    //@}

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

    /** @name Utility methods */
    //@{
    /** Reset the parser
      *
      * This method resets the state of the DOM driver and makes
      * it ready for a fresh parse run.
      */
    void reset();

    /** Adopt the DOM document
      *
      * This method returns the DOMDocument object representing the
      * root of the document tree.
      *
      * The caller will adopt the DOMDocument and thus is responsible to
      * call DOMDocument::release() to release the associated memory.
      * The parser will not delete it.   The ownership is transferred
      * from the parser to the caller.
      *
      * @return The adopted DOMDocument object which represents the entire
      *         XML document.
      */
    DOMDocument* adoptDocument();

    //@}


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

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

    /** Get the DOM document
      *
      * This method returns the DOMDocument object representing the
      * root of the document tree. This object provides the primary
      * access to the document's data.
      *
      * The returned DOMDocument object is owned by the parser.
      *
      * @return The DOMDocument object which represents the entire
      *         XML document.
      */
    DOMDocument* getDocument();

    /** Get a const reference to the validator
      *
      * This method returns a reference to the parser's installed
      * validator.
      *
      * @return A const reference to the installed validator object.
      */
    const XMLValidator& getValidator() const;

    /**
      * This method returns an enumerated value that indicates the current
      * validation scheme set on this parser.
      *
      * @return The ValSchemes value current set on this parser.
      * @see #setValidationScheme
      */
    ValSchemes getValidationScheme() const;

    /** Get the 'do schema' flag
      *
      * This method returns the state of the parser's schema processing
      * flag.
      *
      * @return true, if the parser is currently configured to
      *         understand schema, false otherwise.
      *
      * @see #setDoSchema
      */
    bool getDoSchema() const;

    /** Get the 'full schema constraint checking' flag
      *
      * This method returns the state of the parser's full schema constraint
      * checking flag.
      *
      * @return true, if the parser is currently configured to
      *         have full schema constraint checking, false otherwise.
      *
      * @see #setValidationSchemaFullChecking
      */
    bool getValidationSchemaFullChecking() const;

    /** Get the identity constraint checking' flag
      *
      * This method returns the state of the parser's identity constraint
      * checking flag.
      *
      * @return true, if the parser is currently configured to
      *         have identity constraint checking, false otherwise.
      *
      * @see setIdentityConstraintChecking
      */
    bool getIdentityConstraintChecking() const;

    /** Get error count from the last parse operation.
      *
      * This method returns the error count from the last parse
      * operation. Note that this count is actually stored in the
      * scanner, so this method simply returns what the
      * scanner reports.
      *
      * @return number of errors encountered during the latest
      *			parse operation.
      *
      */
    int getErrorCount() const;

    /** Get the 'do namespaces' flag
      *
      * This method returns the state of the parser's namespace processing
      * flag.
      *
      * @return true, if the parser is currently configured to
      *         understand namespaces, false otherwise.
      *
      * @see #setDoNamespaces
      */
    bool getDoNamespaces() const;

    /** Get the 'exit on first error' flag
      *
      * This method returns the state of the parser's
      * exit-on-First-Fatal-Error flag. If this flag is true, then the
      * parse will exit the first time it sees any non-wellformed XML or
      * any validity error. The default state is true.
      *
      * @return true, if the parser is currently configured to
      *         exit on the first fatal error, false otherwise.
      *
      * @see #setExitOnFirstFatalError
      */
    bool getExitOnFirstFatalError() const;

    /**
      * This method returns the state of the parser's
      * validation-constraint-fatal flag.
      *
      * @return true, if the parser is currently configured to
      *         set validation constraint errors as fatal, false
      *         otherwise.
      *
      * @see #setValidationContraintFatal
      */
    bool getValidationConstraintFatal() const;

    /** Get the 'include entity references' flag
      *
      * This method returns the flag that specifies whether the parser is
      * creating entity reference nodes in the DOM tree being produced.
      *
      * @return  The state of the create entity reference node
      *               flag.
      * @see #setCreateEntityReferenceNodes
      */
    bool  getCreateEntityReferenceNodes()const;

   /** Get the 'include ignorable whitespace' flag.
      *
      * This method returns the state of the parser's include ignorable
      * whitespace flag.
      *
      * @return 'true' if the include ignorable whitespace flag is set on
      *         the parser, 'false' otherwise.
      *
      * @see #setIncludeIgnorableWhitespace
      */
    bool getIncludeIgnorableWhitespace() const;

   /** Get the set of Namespace/SchemaLocation that is specified externaly.
      *
      * This method returns the list of Namespace/SchemaLocation that was
      * specified using setExternalSchemaLocation.
      *
      * The parser owns the returned string, and the memory allocated for
      * the returned string 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.
      *
      * @return a pointer to the list of Namespace/SchemaLocation that was
      *         specified externally.  The pointer spans the same life-time as
      *         the parser.  A null pointer is returned if nothing
      *         was specified externally.
      *
      * @see #setExternalSchemaLocation(const XMLCh* const)
      */
    XMLCh* getExternalSchemaLocation() const;

   /** Get the noNamespace SchemaLocation that is specified externaly.
      *
      * This method returns the no target namespace XML Schema Location
      * that was specified using setExternalNoNamespaceSchemaLocation.
      *
      * The parser owns the returned string, and the memory allocated for
      * the returned string 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.
      *
      * @return a pointer to the no target namespace Schema Location that was
      *         specified externally.  The pointer spans the same life-time as
      *         the parser.  A null pointer is returned if nothing
      *         was specified externally.
      *
      * @see #setExternalNoNamespaceSchemaLocation(const XMLCh* const)
      */
    XMLCh* getExternalNoNamespaceSchemaLocation() const;

   /** Get the SecurityManager instance attached to this parser.
      *
      * This method returns the security manager 
      * that was specified using setSecurityManager.
      *
      * The SecurityManager instance must have been specified by the application; 
      * this should not be deleted until after the parser has been deleted (or
      * a new SecurityManager instance has been supplied to the parser).
      * 
      * @return a pointer to the SecurityManager instance 
      *         specified externally.  A null pointer is returned if nothing
      *         was specified externally.
      *
      * @see #setSecurityManager(const SecurityManager* const)
      */
    SecurityManager* getSecurityManager() const;

    /** Get the 'Loading External DTD' flag
      *
      * This method returns the state of the parser's loading external DTD
      * flag.
      *
      * @return false, if the parser is currently configured to
      *         ignore external DTD completely, true otherwise.
      *
      * @see #setLoadExternalDTD
      * @see #getValidationScheme
      */
    bool getLoadExternalDTD() const;

    /** Get the 'create comment node' flag
      *
      * This method returns the flag that specifies whether the parser is
      * creating comment nodes in the DOM tree being produced.
      *