DOM_DocumentFragment.hpp
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- /*
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 1999-2002 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
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- *
- * 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
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- *
- * 5. Products derived from this software may not be called "Apache",
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- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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- * 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/>.
- */
- /*
- * $Id: DOM_DocumentFragment.hpp,v 1.3 2002/11/04 15:04:44 tng Exp $
- */
- #ifndef DOM_DocumentFragment_HEADER_GUARD_
- #define DOM_DocumentFragment_HEADER_GUARD_
- #include <xercesc/util/XercesDefs.hpp>
- #include "DOM_Node.hpp"
- XERCES_CPP_NAMESPACE_BEGIN
- class DocumentFragmentImpl;
- /**
- * <code>DocumentFragment</code> is a "lightweight" or "minimal"
- * <code>Document</code> object.
- *
- * It is very common to want to be able to
- * extract a portion of a document's tree or to create a new fragment of a
- * document. Imagine implementing a user command like cut or rearranging a
- * document by moving fragments around. It is desirable to have an object
- * which can hold such fragments and it is quite natural to use a Node for
- * this purpose. While it is true that a <code>Document</code> object could
- * fulfil this role, a <code>Document</code> object can potentially be a
- * heavyweight object, depending on the underlying implementation. What is
- * really needed for this is a very lightweight object.
- * <code>DocumentFragment</code> is such an object.
- * <p>Furthermore, various operations -- such as inserting nodes as children
- * of another <code>Node</code> -- may take <code>DocumentFragment</code>
- * objects as arguments; this results in all the child nodes of the
- * <code>DocumentFragment</code> being moved to the child list of this node.
- * <p>The children of a <code>DocumentFragment</code> node are zero or more
- * nodes representing the tops of any sub-trees defining the structure of the
- * document. <code>DocumentFragment</code> nodes do not need to be
- * well-formed XML documents (although they do need to follow the rules
- * imposed upon well-formed XML parsed entities, which can have multiple top
- * nodes). For example, a <code>DocumentFragment</code> might have only one
- * child and that child node could be a <code>Text</code> node. Such a
- * structure model represents neither an HTML document nor a well-formed XML
- * document.
- * <p>When a <code>DocumentFragment</code> is inserted into a
- * <code>Document</code> (or indeed any other <code>Node</code> that may take
- * children) the children of the <code>DocumentFragment</code> and not the
- * <code>DocumentFragment</code> itself are inserted into the
- * <code>Node</code>. This makes the <code>DocumentFragment</code> very
- * useful when the user wishes to create nodes that are siblings; the
- * <code>DocumentFragment</code> acts as the parent of these nodes so that the
- * user can use the standard methods from the <code>Node</code> interface,
- * such as <code>insertBefore()</code> and <code>appendChild()</code>.
- */
- class CDOM_EXPORT DOM_DocumentFragment: public DOM_Node {
- public:
- /** @name Constructors and assignment operators */
- //@{
- /**
- * Default constructor for <code>DOM_DocumentFragment</code>. The resulting object does not
- * refer to an actual Document Fragment 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 Document Fragment node.
- * <p>
- * New document fragment nodes are created by DOM_Document::createDocumentFragment().
- *
- */
- DOM_DocumentFragment();
- /**
- * Copy constructor. Creates a new <code>DOM_DocumentFragment</code> that refers to the
- * same underlying node as the original. See also DOM_Node::clone(),
- * which will copy the actual Document fragment node, rather than just creating a new
- * reference to the original node.
- *
- * @param other The object to be copied
- */
- DOM_DocumentFragment(const DOM_DocumentFragment &other);
- /**
- * Assignment operator
- *
- * @param other The object to be copied
- */
- DOM_DocumentFragment & operator = (const DOM_DocumentFragment &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_DocumentFragment & operator = (const DOM_NullPtr *val);
- //@}
- /** @name Destructor */
- //@{
- /**
- * Destructor. The object being destroyed is the reference
- * object, not the underlying Comment node itself.
- *
- */
- ~DOM_DocumentFragment();
- //@}
- protected:
- DOM_DocumentFragment(DocumentFragmentImpl *);
- friend class DOM_Document;
- friend class RangeImpl;
- };
- XERCES_CPP_NAMESPACE_END
- #endif