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

#if !defined(XMLATTR_HPP)
#define XMLATTR_HPP

#include <xercesc/util/PlatformUtils.hpp>
#include <xercesc/util/QName.hpp>
#include <xercesc/framework/XMLAttDef.hpp>
#include <xercesc/validators/datatype/DatatypeValidator.hpp>

XERCES_CPP_NAMESPACE_BEGIN

/**
 *  This class defines the information about an attribute that will come out
 *  of the scanner during parsing. This information does not depend upon the
 *  type of validator because it is not tied to any scheme/DTD type info. Its
 *  just the raw XML 1.0 information that will be reported about an attribute
 *  in the startElement() callback method of the XMLDocumentHandler class.
 *  Hence it is not intended to be extended or derived from. Its designed to
 *  be used as is.
 *
 *  The 'specified' field of this class indicates whether the attribute was
 *  actually present or whether it was faulted in because it had a fixed or
 *  default value.
 *
 *  The code receiving this information can ask its validator for more info
 *  about the attribute, i.e. get its declaration from the DTD/Schema info.
 *
 *  Because of the heavy use (and reuse) of instances of this class, and the
 *  number of string members it has, this class takes pains to not reallocate
 *  string members unless it has to. It keeps up with how long each buffer
 *  is and only reallocates if the new value won't fit.
 */
class XMLPARSER_EXPORT XMLAttr : public XMemory
{
public:
    // -----------------------------------------------------------------------
    //  Constructors and Destructor
    // -----------------------------------------------------------------------
    /** @name Constructors */
    //@{

    /**
      * The default constructor just setsup an empty attribute to be filled
      * in the later. Though the initial state is a reasonable one, it is
      * not documented because it should not be depended on.
      *
      * @param  manager     The configurable memory manager
      */
    XMLAttr(MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager);

    /**
      * This is the primary constructor which takes all of the information
      * required to construct a complete attribute object.
      *
      * @param  uriId       The id into the validator's URI pool of the URI
      *                     that the prefix mapped to. Only used if namespaces
      *                     are enabled/supported.
      *
      * @param  attrName    The base name of the attribute, i.e. the part
      *                     after any prefix.
      *
      * @param  attrPrefix  The prefix, if any, of this attribute's name. If
      *                     this is empty, then uriID is meaningless as well.
      *
      * @param  attrValue   The value string of the attribute, which should
      *                     be fully normalized by XML rules!
      *
      * @param  type        The type of the attribute. This will indicate
      *                     the type of normalization done and constrains
      *                     the value content. Make sure that the value
      *                     set meets the constraints!
      *
      * @param  specified   Indicates whether the attribute was explicitly
      *                     specified or not. If not, then it was faulted
      *                     in from a FIXED or DEFAULT value.
      *
      * @param  manager     The configurable memory manager
      * @param datatypeValidator type used to validate the attribute, 
      *                         if it was validated by an XML Schema
      * @param isSchema         true if and only if this attribute was validated
      *                         by an XML Schema
      */
    XMLAttr
    (
          const unsigned int        uriId
        , const XMLCh* const        attrName
        , const XMLCh* const        attrPrefix
        , const XMLCh* const        attrValue
        , const XMLAttDef::AttTypes type = XMLAttDef::CData
        , const bool                specified = true
        , MemoryManager* const      manager = XMLPlatformUtils::fgMemoryManager
        , DatatypeValidator * datatypeValidator = 0
        , const bool isSchema = false
    );

    /**
      * This is the primary constructor which takes all of the information
      * required to construct a complete attribute object.
      *
      * @param  uriId       The id into the validator's URI pool of the URI
      *                     that the prefix mapped to. Only used if namespaces
      *                     are enabled/supported.
      *
      * @param  rawName     The raw name of the attribute.
      *
      * @param  attrValue   The value string of the attribute, which should
      *                     be fully normalized by XML rules!
      *
      * @param  type        The type of the attribute. This will indicate
      *                     the type of normalization done and constrains
      *                     the value content. Make sure that the value
      *                     set meets the constraints!
      *
      * @param  specified   Indicates whether the attribute was explicitly
      *                     specified or not. If not, then it was faulted
      *                     in from a FIXED or DEFAULT value.
      *
      * @param  manager     The configurable memory manager
      * @param datatypeValidator type used to validate the attribute, 
      *                         if it was validated by an XML Schema
      * @param isSchema         true if and only if this attribute was validated
      *                         by an XML Schema
      */
    XMLAttr
    (
        const unsigned int uriId
        , const XMLCh* const rawName
        , const XMLCh* const attrValue
        , const XMLAttDef::AttTypes type = XMLAttDef::CData
        , const bool specified = true
        , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager
        , DatatypeValidator * datatypeValidator = 0
        , const bool isSchema = false
    );

    //@}

    /** @name Destructor */
    //@{
    ~XMLAttr();
    //@}


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

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

    /**
      * This methode returns the attribute name in a QName format.
      */
    QName* getAttName() const;

    /**
      * This method gets a const pointer tot he name of the attribute. The
      * form of this name is defined by the validator in use.
      */
    const XMLCh* getName() const;

    /**
      * This method will get a const pointer to the prefix string of this
      * attribute. Since prefixes are optional, it may be zero.
      */
    const XMLCh* getPrefix() const;

    /**
      * This method will get the QName of this attribute, which will be the
      * prefix if any, then a colon, then the base name. If there was no
      * prefix, its the same as the getName() method.
      */
    const XMLCh* getQName() const;

    /**
      * This method will get the specified flag, which indicates whether
      * the attribute was explicitly specified or just faulted in.
      */
    bool getSpecified() const;

    /**
      * This method will get the type of the attribute. The available types
      * are defined by the XML specification.
      */
    XMLAttDef::AttTypes getType() const;

    /**
      * This method will get the value of the attribute. The value can be
      * be an empty string, but never null if the object is correctly
      * set up.
      */
    const XMLCh* getValue() const;

    /**
      * This method will get the id of the URI that this attribute's prefix
      * mapped to. If namespaces are not on, then its value is meaningless.
      */
    unsigned int getURIId() const;

    /**
     * @return the uri part of DOM Level 3 TypeInfo
     * @deprecated
     */
    const XMLCh* getValidatingTypeURI() const;

    /**
     * @return the name part of DOM Level 3 TypeInfo
     * @deprecated
     */
    const XMLCh* getValidatingTypeName() const;

    //@}


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

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

    /**
      * This method is called to set up a default constructed object after
      * the fact, or to reuse a previously used object.
      *
      * @param  uriId       The id into the validator's URI pool of the URI
      *                     that the prefix mapped to. Only used if namespaces
      *                     are enabled/supported.
      *
      * @param  attrName    The base name of the attribute, i.e. the part
      *                     after any prefix.
      *
      * @param  attrPrefix  The prefix, if any, of this attribute's name. If
      *                     this is empty, then uriID is meaningless as well.
      *
      * @param  attrValue   The value string of the attribute, which should
      *                     be fully normalized by XML rules according to the
      *                     attribute type.
      *
      * @param  type        The type of the attribute. This will indicate
      *                     the type of normalization done and constrains
      *                     the value content. Make sure that the value
      *                     set meets the constraints!
      * @param datatypeValidator type used to validate the attribute, 
      *                         if it was validated by an XML Schema
      * @param isSchema         true if and only if this attribute was validated
      *                         by an XML Schema
      *
      */
    void set
    (
        const   unsigned int        uriId
        , const XMLCh* const        attrName
        , const XMLCh* const        attrPrefix
        , const XMLCh* const        attrValue
        , const XMLAttDef::AttTypes type = XMLAttDef::CData
        , DatatypeValidator * datatypeValidator = 0
        , const bool isSchema = false
    );

    /**
      * This method is called to set up a default constructed object after
      * the fact, or to reuse a previously used object.
      *
      * @param  uriId       The id into the validator's URI pool of the URI
      *                     that the prefix mapped to. Only used if namespaces
      *                     are enabled/supported.
      *
      * @param  attrRawName The raw name of the attribute.
      *
      * @param  attrValue   The value string of the attribute, which should
      *                     be fully normalized by XML rules according to the
      *                     attribute type.
      *