DOM_Element.hpp
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上传日期:2007-01-10
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xml/soap/webservice
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C/C++
- /*
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 1999-2001 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Xerces" and "Apache Software Foundation" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * nor may "Apache" appear in their name, without prior written
- * permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation, and was
- * originally based on software copyright (c) 1999, International
- * Business Machines, Inc., http://www.ibm.com . For more information
- * on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
- /*
- * $Log: DOM_Element.hpp,v $
- * Revision 1.9 2001/05/11 13:25:20 tng
- * Copyright update.
- *
- * Revision 1.8 2001/05/03 19:17:26 knoaman
- * TraverseSchema Part II.
- *
- * Revision 1.7 2000/03/02 19:53:55 roddey
- * This checkin includes many changes done while waiting for the
- * 1.1.0 code to be finished. I can't list them all here, but a list is
- * available elsewhere.
- *
- * Revision 1.6 2000/02/24 20:11:27 abagchi
- * Swat for removing Log from API docs
- *
- * Revision 1.5 2000/02/17 17:47:24 andyh
- * Update Doc++ API comments
- * NameSpace update to track W3C
- * Changes were made by Chih Hsiang Chou
- *
- * Revision 1.4 2000/02/06 07:47:29 rahulj
- * Year 2K copyright swat.
- *
- * Revision 1.3 2000/01/05 01:16:07 andyh
- * DOM Level 2 core, namespace support added.
- *
- * Revision 1.2 1999/12/21 07:47:06 robweir
- * Patches to support Xalan, where we need to create a
- * "special" DOM with subclassed Nodes.
- *
- * 1. Export the NodeImpl-derived classes
- * 2. Ensure that their constructors have at least protected access
- *
- * Revision 1.1.1.1 1999/11/09 01:08:57 twl
- * Initial checkin
- *
- * Revision 1.3 1999/11/08 20:44:17 rahul
- * Swat for adding in Product name and CVS comment log variable.
- *
- */
- #ifndef DOM_Element_HEADER_GUARD_
- #define DOM_Element_HEADER_GUARD_
- #include <util/XercesDefs.hpp>
- #include <dom/DOM_Node.hpp>
- class DOM_Attr;
- class DOM_NodeList;
- class ElementImpl;
- /**
- * By far the vast majority of objects (apart from text) that authors
- * encounter when traversing a document are <code>DOM_Element</code> nodes.
- *
- * Assume the following XML document:<elementExample id="demo">
- * <subelement1/>
- * <subelement2><subsubelement/></subelement2>
- * </elementExample>
- * <p>When represented using DOM, the top node is an <code>DOM_Element</code> node
- * for "elementExample", which contains two child <code>DOM_Element</code> nodes,
- * one for "subelement1" and one for "subelement2". "subelement1" contains no
- * child nodes.
- * <p>Elements may have attributes associated with them; since the
- * <code>DOM_Element</code> interface inherits from <code>DOM_Node</code>, the generic
- * <code>DOM_Node</code> interface method <code>getAttributes</code> may be used
- * to retrieve the set of all attributes for an element. There are methods on
- * the <code>DOM_Element</code> interface to retrieve either an <code>DOM_Attr</code>
- * object by name or an attribute value by name. In XML, where an attribute
- * value may contain entity references, an <code>DOM_Attr</code> object should be
- * retrieved to examine the possibly fairly complex sub-tree representing the
- * attribute value. On the other hand, in HTML, where all attributes have
- * simple string values, methods to directly access an attribute value can
- * safely be used as a convenience.
- */
- class CDOM_EXPORT DOM_Element: public DOM_Node {
- private:
- public:
- /** @name Constructors and assignment operator */
- //@{
- /**
- * Default constructor for DOM_Element. The resulting object does not
- * refer to an actual Element node; it will compare == to 0, and is similar
- * to a null object reference variable in Java. It may subsequently be
- * assigned to refer to an actual Element node.
- * <p>
- * New comment nodes are created by DOM_Document::createElement().
- *
- */
- DOM_Element();
- /**
- * Copy constructor. Creates a new <code>DOM_Element</code> that refers to the
- * same underlying actual element as the original.
- *
- * @param other The object to be copied
- */
- DOM_Element(const DOM_Element &other);
- /**
- * Assignment operator.
- *
- * @param other The object to be copied.
- */
- DOM_Element & operator = (const DOM_Element &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_Element & operator = (const DOM_NullPtr *val);
- //@}
- /** @name Destructor. */
- //@{
- /**
- * Destructor. The object being destroyed is the reference
- * object, not the underlying Element itself.
- *
- */
- ~DOM_Element();
- //@}
- /** @name Getter functions. */
- //@{
- /**
- * The name of the element.
- *
- * For example, in: <elementExample
- * id="demo"> ... </elementExample> , <code>tagName</code> has
- * the value <code>"elementExample"</code>. Note that this is
- * case-preserving in XML, as are all of the operations of the DOM.
- */
- DOMString getTagName() const;
- /**
- * Retrieves an attribute value by name.
- *
- * @param name The name of the attribute to retrieve.
- * @return The <code>DOM_Attr</code> value as a string, or the empty string if
- * that attribute does not have a specified or default value.
- */
- DOMString getAttribute(const DOMString &name) const;
- /**
- * Retrieves an <code>DOM_Attr</code> node by name.
- *
- * @param name The name (<CODE>nodeName</CODE>) of the attribute to retrieve.
- * @return The <code>DOM_Attr</code> node with the specified name (<CODE>nodeName</CODE>) or
- * <code>null</code> if there is no such attribute.
- */
- DOM_Attr getAttributeNode(const DOMString &name) const;
- /**
- * Returns a <code>NodeList</code> of all descendant elements with a given
- * tag name, in the order in which they would be encountered in a preorder
- * traversal of the <code>DOM_Element</code> tree.
- *
- * @param name The name of the tag to match on. The special value "*"
- * matches all tags.
- * @return A list of matching <code>DOM_Element</code> nodes.
- */
- DOM_NodeList getElementsByTagName(const DOMString &name) const;
- //@}
- /** @name Set functions. */
- //@{
- /**
- * Adds a new attribute.
- *
- * If an attribute with that name is already present
- * in the element, its value is changed to be that of the value parameter.
- * This value is a simple string, it is not parsed as it is being set. So
- * any markup (such as syntax to be recognized as an entity reference) is
- * treated as literal text, and needs to be appropriately escaped by the
- * implementation when it is written out. In order to assign an attribute
- * value that contains entity references, the user must create an
- * <code>DOM_Attr</code> node plus any <code>Text</code> and
- * <code>EntityReference</code> nodes, build the appropriate subtree, and
- * use <code>setAttributeNode</code> to assign it as the value of an
- * attribute.
- * @param name The name of the attribute to create or alter.
- * @param value Value to set in string form.
- * @exception DOMException
- * INVALID_CHARACTER_ERR: Raised if the specified name contains an
- * illegal character.
- * <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
- */
- void setAttribute(const DOMString &name,
- const DOMString &value);
- /**
- * Adds a new attribute.
- *
- * If an attribute with that name (<CODE>nodeName</CODE>) is already present
- * in the element, it is replaced by the new one.
- * @param newAttr The <code>DOM_Attr</code> node to add to the attribute list.
- * @return If the <code>newAttr</code> attribute replaces an existing
- * attribute, the replaced
- * <code>DOM_Attr</code> node is returned, otherwise <code>null</code> is
- * returned.
- * @exception DOMException
- * WRONG_DOCUMENT_ERR: Raised if <code>newAttr</code> was created from a
- * different document than the one that created the element.
- * <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
- * <br>INUSE_ATTRIBUTE_ERR: Raised if <code>newAttr</code> is already an
- * attribute of another <code>DOM_Element</code> object. The DOM user must
- * explicitly clone <code>DOM_Attr</code> nodes to re-use them in other
- * elements.
- */
- DOM_Attr setAttributeNode(DOM_Attr newAttr);
- //@}
- /** @name Functions which modify the Element. */
- //@{
- /**
- * Removes the specified attribute node.
- * If the removed <CODE>DOM_Attr</CODE>
- * has a default value it is immediately replaced. The replacing attribute
- * has the same namespace URI and local name, as well as the original prefix,
- * when applicable.
- *
- * @param oldAttr The <code>DOM_Attr</code> node to remove from the attribute
- * list.
- * @return The <code>DOM_Attr</code> node that was removed.
- * @exception DOMException
- * NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
- * <br>NOT_FOUND_ERR: Raised if <code>oldAttr</code> is not an attribute
- * of the element.
- */
- DOM_Attr removeAttributeNode(DOM_Attr oldAttr);
- /**
- * Removes an attribute by name.
- *
- * If the removed attribute
- * is known to have a default value, an attribute immediately appears
- * containing the default value as well as the corresponding namespace URI,
- * local name, and prefix when applicable.<BR>To remove an attribute by local
- * name and namespace URI, use the <CODE>removeAttributeNS</CODE> method.
- * @param name The name of the attribute to remove.
- * @exception DOMException
- * NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
- */
- void removeAttribute(const DOMString &name);
- //@}
- /** @name Functions introduced in DOM Level 2. */
- //@{
- /**
- * Retrieves an attribute value by local name and namespace URI.
- *
- * <p><b>"Experimental - subject to change"</b></p>
- *
- * @param namespaceURI The <em>namespace URI</em> of
- * the attribute to retrieve.
- * @param localName The <em>local name</em> of the
- * attribute to retrieve.
- * @return The <code>DOM_Attr</code> value as a string, or an <CODE>null</CODE> if
- * that attribute does not have a specified or default value.
- */
- DOMString getAttributeNS(const DOMString &namespaceURI,
- const DOMString &localName) const;
- /**
- * Adds a new attribute. If an attribute with the same
- * local name and namespace URI is already present on the element, its prefix
- * is changed to be the prefix part of the <CODE>qualifiedName</CODE>, and
- * its value is changed to be the <CODE>value</CODE> parameter. This value is
- * a simple string, it is not parsed as it is being set. So any markup (such
- * as syntax to be recognized as an entity reference) is treated as literal
- * text, and needs to be appropriately escaped by the implementation when it
- * is written out. In order to assign an attribute value that contains entity
- * references, the user must create an <CODE>DOM_Attr</CODE>
- * node plus any <CODE>DOM_Text</CODE> and <CODE>DOM_EntityReference</CODE>
- * nodes, build the appropriate subtree, and use
- * <CODE>setAttributeNodeNS</CODE> or <CODE>setAttributeNode</CODE> to assign
- * it as the value of an attribute.
- *
- * <p><b>"Experimental - subject to change"</b></p>
- *
- * @param namespaceURI The <em>namespace URI</em> of
- * the attribute to create or alter.
- * @param qualifiedName The <em>qualified name</em> of the
- * attribute to create or alter.
- * @param value The value to set in string form.
- * @exception DOMException
- * INVALID_CHARACTER_ERR: Raised if the specified qualified name contains an
- * illegal character.
- * <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
- * <br>
- * NAMESPACE_ERR: Raised if the <CODE>qualifiedName</CODE> is
- * malformed, if the <CODE>qualifiedName</CODE> has a prefix and the
- * <CODE>namespaceURI</CODE> is <CODE>null</CODE> or an empty string,
- * if the <CODE>qualifiedName</CODE> has a prefix that is "xml" and the
- * <CODE>namespaceURI</CODE> is different from
- * "http://www.w3.org/XML/1998/namespace", if the
- * <CODE>qualifiedName</CODE> has a prefix that is "xmlns" and the
- * <CODE>namespaceURI</CODE> is different from
- * "http://www.w3.org/2000/xmlns/", or if the
- * <CODE>qualifiedName</CODE> is "xmlns" and the
- * <CODE>namespaceURI</CODE> is different from
- * "http://www.w3.org/2000/xmlns/".
- */
- void setAttributeNS(const DOMString &namespaceURI,
- const DOMString &qualifiedName, const DOMString &value);
- /**
- * Removes an attribute by local name and namespace URI. If the
- * removed attribute has a default value it is immediately replaced.
- * The replacing attribute has the same namespace URI and local name, as well as
- * the original prefix.
- *
- * <p><b>"Experimental - subject to change"</b></p>
- *
- * @param namespaceURI The <em>namespace URI</em> of
- * the attribute to remove.
- * @param localName The <em>local name</em> of the
- * attribute to remove.
- * @exception DOMException
- * NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
- */
- void removeAttributeNS(const DOMString &namespaceURI,
- const DOMString &localName);
- /**
- * Retrieves an <code>DOM_Attr</code> node by local name and namespace URI.
- *
- * <p><b>"Experimental - subject to change"</b></p>
- *
- * @param namespaceURI The <em>namespace URI</em> of
- * the attribute to retrieve.
- * @param localName The <em>local name</em> of the
- * attribute to retrieve.
- * @return The <code>DOM_Attr</code> node with the specified attribute local
- * name and namespace URI or <code>null</code> if there is no such attribute.
- */
- DOM_Attr getAttributeNodeNS(const DOMString &namespaceURI,
- const DOMString &localName) const;
- /**
- * Adds a new attribute.
- *
- * If an attribute with that local name and namespace URI is already present
- * in the element, it is replaced by the new one.
- *
- * <p><b>"Experimental - subject to change"</b></p>
- *
- * @param newAttr The <code>DOM_Attr</code> node to add to the attribute list.
- * @return If the <code>newAttr</code> attribute replaces an existing
- * attribute with the same <em>local name</em> and <em>namespace URI</em>,
- * the replaced <code>DOM_Attr</code> node is
- * returned, otherwise <code>null</code> is returned.
- * @exception DOMException
- * WRONG_DOCUMENT_ERR: Raised if <code>newAttr</code> was created from a
- * different document than the one that created the element.
- * <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
- * <br>INUSE_ATTRIBUTE_ERR: Raised if <code>newAttr</code> is already an
- * attribute of another <code>DOM_Element</code> object. The DOM user must
- * explicitly clone <code>DOM_Attr</code> nodes to re-use them in other
- * elements.
- */
- DOM_Attr setAttributeNodeNS(DOM_Attr newAttr);
- /**
- * Returns a <code>DOM_NodeList</code> of all the <code>DOM_Element</code>s
- * with a given local name and namespace URI in the order in which they
- * would be encountered in a preorder traversal of the
- * <code>DOM_Document</code> tree, starting from this node.
- *
- * <p><b>"Experimental - subject to change"</b></p>
- *
- * @param namespaceURI The <em>namespace URI</em> of
- * the elements to match on. The special value "*" matches all
- * namespaces.
- * @param localName The <em>local name</em> of the
- * elements to match on. The special value "*" matches all local names.
- * @return A new <code>DOM_NodeList</code> object containing all the matched
- * <code>DOM_Element</code>s.
- */
- DOM_NodeList getElementsByTagNameNS(const DOMString &namespaceURI,
- const DOMString &localName) const;
- //@}
- protected:
- DOM_Element(ElementImpl *impl);
- friend class DOM_Document;
- friend class DOM_Attr;
- friend class TraverseSchema;
- };
- #endif