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

#if !defined(XMLELEMENTDECL_HPP)
#define XMLELEMENTDECL_HPP

#include <xercesc/framework/XMLAttr.hpp>
#include <xercesc/framework/XMLAttDefList.hpp>
#include <xercesc/util/XMLString.hpp>
#include <xercesc/util/PlatformUtils.hpp>
#include <xercesc/internal/XSerializable.hpp>

XERCES_CPP_NAMESPACE_BEGIN

class ContentSpecNode;
class XMLContentModel;

/**
 *  This class defines the core information of an element declaration. Each
 *  validator (DTD, Schema, etc...) will have its own information that it
 *  associations with the declaration of an element, but they must all share
 *  at least this core information, i.e. they must all derive from this
 *  class. The set of info enforced at this level is driven by the needs of
 *  XML 1.0 spec validation and well formedness checks.
 *
 *  This class defines some special element id values for invalid elements
 *  and PCDATA elements, as well as a string for the special PCDATA element
 *  name. All validators must honor these special values in order to allow
 *  content models to work generically (i.e. to let code know when its dealing
 *  with invalid or PCDATA element ids without having to know what type of
 *  validator its messing with.)
 */
class XMLPARSER_EXPORT XMLElementDecl : public XSerializable, public XMemory
{
 public:
    // -----------------------------------------------------------------------
    //  Class specific types
    //
    //  CreateReasons
    //      This type is used to store how an element declaration got into
    //      the grammar's element pool. They are faulted in for various
    //      reasons.
    //
    //  LookupOpts
    //      These are the values used by the attribute lookup methods.
    //
    //  CharDataOpts
    //      This is used to indicate how this type of element reacts to
    //      character data as content.
    // -----------------------------------------------------------------------
    enum CreateReasons
    {
        NoReason
        , Declared
        , AttList
        , InContentModel
        , AsRootElem
        , JustFaultIn
    };

    /**
     * @deprecated Use of addIfNotFound couldl produce undefined 
     * behaviour in multithreaded environments.
     */
    enum LookupOpts
    {
        AddIfNotFound
        , FailIfNotFound
    };

    enum CharDataOpts
    {
        NoCharData
        , SpacesOk
        , AllCharData
    };


    // -----------------------------------------------------------------------
    //  Public static data
    //
    //  fgInvalidElemId
    //      A value to represent an invalid element node id.
    //
    //  fgPCDataElemId
    //      This is the value to use to represent a PCDATA node when an
    //      element id is required.
    //
    //  fgPCDataElemName
    //      This is the value to use to represent a PCDATA node when an
    //      element name is required.
    // -----------------------------------------------------------------------
    static const unsigned int   fgInvalidElemId;
    static const unsigned int   fgPCDataElemId;
    static const XMLCh          fgPCDataElemName[];



    // -----------------------------------------------------------------------
    //  Destructor
    // -----------------------------------------------------------------------
    /** @name Destructor */
    //@{
    virtual ~XMLElementDecl();
    //@}


    // -----------------------------------------------------------------------
    //  The virtual element decl interface
    // -----------------------------------------------------------------------

    /** @name Virual ElementDecl interface */
    //@{

    /** Find an attribute by name or optionally fault it in.
      *
      * The derived class should look up the passed attribute in the list of
      * of attributes for this element. If namespaces are enabled, then it
      * should use the uriId/baseName pair, else it should use the qName. The
      * options allow the caller to indicate whether the attribute should be
      * defaulted in if not found. If it is defaulted in, then wasAdded should
      * be set, else it should be cleared. If its not found and the caller does
      * not want defaulting, then return a null pointer.
      * Note that, in a multithreaded environment, it is dangerous for a 
      * caller to invoke this method with options set to AddIfNotFound.
      *
      * @param  qName       This is the qName of the attribute, i.e. the actual
      *                     lexical name found.
      *
      * @param  uriId       This is the id of the URI of the namespace to which
      *                     this attribute mapped. Only valid if namespaces are
      *                     enabled.
      *
      * @param  baseName    This is the base part of the name, i.e. after any
      *                     prefix.
      *
      * @param  prefix      The prefix, if any, of this attribute's name. If
      *                     this is empty, then uriID is meaningless as well.
      *
      * @param  options     Indicates the lookup options.
      *
      * @param  wasAdded    Should be set if the attribute is faulted in, else
      *                     cleared.
      */
    virtual XMLAttDef* findAttr
    (
        const   XMLCh* const    qName
        , const unsigned int    uriId
        , const XMLCh* const    baseName
        , const XMLCh* const    prefix
        , const LookupOpts      options
        ,       bool&           wasAdded
    )   const = 0;

    /** Get a list of attributes defined for this element.
      *
      * The derived class should return a reference to some member object which
      * implements the XMLAttDefList interface. This object gives the scanner the
      * ability to look through the attributes defined for this element.
      *
      * It is done this way for efficiency, though of course this is not thread
      * safe. The scanner guarantees that it won't ever call this method in any
      * nested way, but the outside world must be careful about when it calls
      * this method, and optimally never would.
      */
    virtual XMLAttDefList& getAttDefList() const = 0;

    /** The character data options for this element type
      *
      * The derived class should return an appropriate character data opts value
      * which correctly represents its tolerance towards whitespace or character
      * data inside of its instances. This allows the scanner to do all of the
      * validation of character data.
      */
    virtual CharDataOpts getCharDataOpts() const = 0;

    /** Indicate whether this element type defined any attributes
      *
      * The derived class should return a boolean that indicates whether this
      * element has any attributes defined for it or not. This is an optimization
      * that allows the scanner to skip some work if no attributes exist.
      */
    virtual bool hasAttDefs() const = 0;

    /** Reset the flags on the attribute definitions.
      *
      * This method is called by the scanner at the beginning of each scan
      * of a start tag, asking this element decl to reset the 'declared' flag
      * of each of its attribute defs. This allows the scanner to mark each
      * one as declared yet or not.
      */
    virtual bool resetDefs() = 0;

    /** Get a pointer to the content spec node
      *
      * This method will return a const pointer to the content spec node object
      * of this element.
      *
      * @return A const pointer to the element's content spec node
      */
    virtual const ContentSpecNode* getContentSpec() const = 0;

    /** Get a pointer to the content spec node
      *
      * This method is identical to the previous one, except that it is non
      * const.
      */
    virtual ContentSpecNode* getContentSpec() = 0;

    /** Set the content spec node object for this element type
      *
      * This method will adopt the based content spec node object. This is called
      * by the actual validator which is parsing its DTD or Schema or whatever
      * and store it on the element decl object via this method.
      *
      * @param  toAdopt This method will adopt the passed content node spec
      *         object. Any previous object is destroyed.
      */
    virtual void setContentSpec(ContentSpecNode* toAdopt) = 0;

    /** Get a pointer to the abstract content model
      *
      * This method will return a const pointer to the content model object
      * of this element. This class is a simple abstraction that allows an
      * element to define and use multiple, specialized content model types
      * internally but still allow the outside world to do simple stuff with
      * them.
      *
      * @return A pointer to the element's content model, via the basic
      * abstract content model type.
      */
    virtual XMLContentModel* getContentModel() = 0;

    /** Set the content model object for this element type
      *
      * This method will adopt the based content model object. This is called
      * by the actual validator which is parsing its DTD or Schema or whatever
      * a creating an element decl. It will build what it feels is the correct
      * content model type object and store it on the element decl object via
      * this method.
      *
      * @param  newModelToAdopt This method will adopt the passed content model
      *         object. Any previous object is destroyed.
      */
    virtual void setContentModel(XMLContentModel* const newModelToAdopt) = 0;

    /** Geta formatted string of the content model
      *
      * This method is a convenience method which will create a formatted
      * representation of the content model of the element. It will not always
      * exactly recreate the original model, since some normalization or
      * or reformatting may occur. But, it will be a technically accurate
      * representation of the original content model.
      *
      * @return A pointer to an internal buffer which contains the formatted
      *         content model. The caller does not own this buffer and should
      *         copy it if it needs to be kept around.
      */
    virtual const XMLCh* getFormattedContentModel ()   const = 0;

    //@}


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

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

    /** Get the base name of this element type.
      *
      * Return the base name part of the element's name. This is the
      * same regardless of whether namespaces are enabled or not.
      *
      * @return A const pointer to the base name of the element decl.
      */
    const XMLCh* getBaseName() const;
    XMLCh* getBaseName();

    /** Get the URI id of this element type.
      *
      * Return the URI Id of this element.
      *
      * @return The URI Id of the element decl, or the emptyNamespaceId if not applicable.
      */
    unsigned int getURI() const;

    /** Get the QName of this element type.
      *
      * Return the QName part of the element's name.  This is the
      * same regardless of whether namespaces are enabled or not.
      *
      * @return A const pointer to the QName of the element decl.
      */