/* * Copyright 1999-2002,2004 The Apache Software Foundation. *  * Licensed 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: DOM_Attr.hpp,v 1.5 2004/09/08 13:55:42 peiyongz Exp $ */#ifndef DOM_Attr_HEADER_GUARD_#define DOM_Attr_HEADER_GUARD_#include <xercesc/util/XercesDefs.hpp>#include "DOM_Node.hpp"#include "DOM_Element.hpp"XERCES_CPP_NAMESPACE_BEGINclass AttrImpl;/*** The <code>DOM_Attr</code> class refers to an attribute of an XML element.** Typically the allowable values for the* attribute are defined in a documenttype definition.* <p><code>DOM_Attr</code> objects inherit the <code>DOM_Node</code>  interface, but* since attributes are not actually child nodes of the elements they are associated with, the* DOM does not consider them part of the document  tree.  Thus, the* <code>DOM_Node</code> attributes <code>parentNode</code>,* <code>previousSibling</code>, and <code>nextSibling</code> have a  null* value for <code>DOM_Attr</code> objects. The DOM takes the  view that* attributes are properties of elements rather than having a  separate* identity from the elements they are associated with;  this should make it* more efficient to implement such features as default attributes associated* with all elements of a  given type.  Furthermore, attribute nodes* may not be immediate children of a <code>DocumentFragment</code>. However,* they can be associated with <code>Element</code> nodes contained within a* <code>DocumentFragment</code>. In short, users of the DOM* need to be aware that  <code>Attr</code> nodes have some things in  common* with other objects inheriting the <code>Node</code> interface, but they* also are quite distinct.**/class DEPRECATED_DOM_EXPORT DOM_Attr: public DOM_Node {public:  /** @name Constructors and assignment operators */  //@{  /**    * Default constructor for DOM_Attr.  The resulting object does not    * refer to any Attribute; it will compare == to 0, and is similar    * to a null object reference variable in Java.    *    */    DOM_Attr();public:  /**    * Copy constructor.  Creates a new <code>DOM_Attr</code> that refers to the    *   same underlying Attribute as the original.  See also DOM_Node::clone(),    * which will copy an actual attribute, rather than just creating a new    * reference to the original attribute.    *    * @param other The source attribute reference object    */    DOM_Attr(const DOM_Attr &other);  /**    * Assignment operator    *    * @param other The source attribute object    */    DOM_Attr & operator = (const DOM_Attr &other);    /**      * Assignment operator.  This overloaded variant is provided for      *   the sole purpose of setting a DOM_Node reference variable to      *   zero.  Nulling out a reference variable in this way will decrement      *   the reference count on the underlying Node object that the variable      *   formerly referenced.  This effect is normally obtained when reference      *   variable goes out of scope, but zeroing them can be useful for      *   global instances, or for local instances that will remain in scope      *   for an extended time,  when the storage belonging to the underlying      *   node needs to be reclaimed.      *      * @param val   Only a value of 0, or null, is allowed.      */    DOM_Attr & operator = (const DOM_NullPtr *val);	//@}  /** @name Destructor */  //@{	  /**    * Destructor.  The object being destroyed is a reference to the Attribute    * "node", not the underlying attribute itself.    *    */    ~DOM_Attr();	//@}  /** @name Getter functions */  //@{    /**    * Returns the name of this attribute.    */    DOMString       getName() const;    /**    *    * Returns true if the attribute received its value explicitly in the    * XML document, or if a value was assigned programatically with    * the setValue function.  Returns false if the attribute value    * came from the default value declared in the document's DTD.    */    bool            getSpecified() const;    /**	* Returns the value of the attribute.	*    * The value of the attribute is returned as a string.    * Character and general entity references are replaced with their values.    */    DOMString       getValue() const;	//@}  /** @name Setter functions */  //@{    /**	* Sets the value of the attribute.  A text node with the unparsed contents    * of the string will be created.	*    * @param value The value of the DOM attribute to be set    */    void            setValue(const DOMString &value);	//@}    /** @name Functions introduced in DOM Level 2. */    //@{    /**     * The <code>DOM_Element</code> node this attribute is attached to or     * <code>null</code> if this attribute is not in use.     *     */    DOM_Element     getOwnerElement() const;    //@}protected:    DOM_Attr(AttrImpl *attr);    friend class DOM_Element;    friend class DOM_Document;};XERCES_CPP_NAMESPACE_END#endif