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ParentNode Class Reference

Inheritance diagram for ParentNode:

List of all members.

Public Methods
	ParentNode (DocumentImpl *ownerDocument)
	ParentNode (const ParentNode &other)
virtual DocumentImpl *	getOwnerDocument ()
virtual void	setOwnerDocument (DocumentImpl *doc)
virtual NodeListImpl *	getChildNodes ()
virtual NodeImpl *	getFirstChild ()
virtual NodeImpl *	getLastChild ()
virtual unsigned int	getLength ()
virtual bool	hasChildNodes ()
virtual NodeImpl *	insertBefore (NodeImpl *newChild, NodeImpl *refChild)
virtual NodeImpl *	item (unsigned int index)
virtual NodeImpl *	removeChild (NodeImpl *oldChild)
virtual NodeImpl *	replaceChild (NodeImpl *newChild, NodeImpl *oldChild)
virtual void	setReadOnly (bool isReadOnly, bool deep)
virtual void	normalize ()
virtual DocumentImpl *	getDocument ()
Public Attributes
DocumentImpl *	ownerDocument
ChildNode *	firstChild
Protected Methods
void	cloneChildren (const NodeImpl &other)
ChildNode *	lastChild ()
void	lastChild (ChildNode *)
Protected Attributes
int	fCachedLength
ChildNode *	fCachedChild
int	fCachedChildIndex

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Detailed Description

ParentNode inherits from ChildImpl and adds the capability of having child nodes. Not every node in the DOM can have children, so only nodes that can should inherit from this class and pay the price for it.

ParentNode, just like NodeImpl, also implements NodeList, so it can return itself in response to the getChildNodes() query. This eliminiates the need for a separate ChildNodeList object. Note that this is an IMPLEMENTATION DETAIL; applications should _never_ assume that this identity exists.

While we have a direct reference to the first child, the last child is stored as the previous sibling of the first child. First child nodes are marked as being so, and getNextSibling hides this fact.

Note: Not all parent nodes actually need to also be a child. At some point we used to have ParentNode inheriting from NodeImpl and another class called ChildAndParentNode that inherited from ChildNode. But due to the lack of multiple inheritance a lot of code had to be duplicated which led to a maintenance nightmare. At the same time only a few nodes (Document, DocumentFragment, Entity, and Attribute) cannot be a child so the gain is memory wasn't really worth it. The only type for which this would be the case is Attribute, but we deal with there in another special way, so this is not applicable.

WARNING: Some of the code here is partially duplicated in AttrImpl, be careful to keep these two classes in sync!

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Member Data Documentation

ChildNode* ParentNode::fCachedChild [protected]

Last requested child.

int ParentNode::fCachedChildIndex [protected]

Last requested child index.

int ParentNode::fCachedLength [protected]

Cached node list length.

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The documentation for this class was generated from the following files:

• ParentNode.hpp
• ParentNode.cpp

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