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88 lines
3.2 KiB
C++
88 lines
3.2 KiB
C++
//
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// DocumentFragment.h
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//
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// Library: XML
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// Package: DOM
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// Module: DOM
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//
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// Definition of the DOM DocumentFragment class.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef DOM_DocumentFragment_INCLUDED
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#define DOM_DocumentFragment_INCLUDED
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#include "Poco/DOM/AbstractContainerNode.h"
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#include "Poco/XML/XML.h"
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#include "Poco/XML/XMLString.h"
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namespace Poco
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{
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namespace XML
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{
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class XML_API DocumentFragment : public AbstractContainerNode
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/// DocumentFragment is a "lightweight" or "minimal" Document object. It is
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/// very common to want to be able to extract a portion of a document's tree
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/// or to create a new fragment of a document. Imagine implementing a user command
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/// like cut or rearranging a document by moving fragments around. It is desirable
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/// to have an object which can hold such fragments and it is quite natural
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/// to use a Node for this purpose. While it is true that a Document object
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/// could fulfill this role, a Document object can potentially be a heavyweight
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/// object, depending on the underlying implementation. What is really needed
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/// for this is a very lightweight object. DocumentFragment is such an object.
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///
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/// Furthermore, various operations -- such as inserting nodes as children of
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/// another Node -- may take DocumentFragment objects as arguments; this results
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/// in all the child nodes of the DocumentFragment being moved to the child
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/// list of this node.
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///
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/// The children of a DocumentFragment node are zero or more nodes representing
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/// the tops of any sub-trees defining the structure of the document. DocumentFragment
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/// nodes do not need to be well-formed XML documents (although they do need
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/// to follow the rules imposed upon well-formed XML parsed entities, which
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/// can have multiple top nodes). For example, a DocumentFragment might have
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/// only one child and that child node could be a Text node. Such a structure
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/// model represents neither an HTML document nor a well-formed XML document.
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///
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/// When a DocumentFragment is inserted into a Document (or indeed any other
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/// Node that may take children) the children of the DocumentFragment and not
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/// the DocumentFragment itself are inserted into the Node. This makes the DocumentFragment
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/// very useful when the user wishes to create nodes that are siblings; the
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/// DocumentFragment acts as the parent of these nodes so that the user can
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/// use the standard methods from the Node interface, such as insertBefore and
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/// appendChild.
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{
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public:
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// Node
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const XMLString & nodeName() const;
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unsigned short nodeType() const;
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protected:
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DocumentFragment(Document * pOwnerDocument);
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DocumentFragment(Document * pOwnerDocument, const DocumentFragment & fragment);
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~DocumentFragment();
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Node * copyNode(bool deep, Document * pOwnerDocument) const;
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private:
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static const XMLString NODE_NAME;
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friend class Document;
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};
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}
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} // namespace Poco::XML
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#endif // DOM_DocumentFragment_INCLUDED
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