DOM::NodeFilter Class Reference

#include <dom2_traversal.h>

Public Types
enum	AcceptCode { FILTER_ACCEPT = 1, FILTER_REJECT = 2, FILTER_SKIP = 3 }
enum	ShowCode {   SHOW_ALL = 0xFFFFFFFF, SHOW_ELEMENT = 0x00000001, SHOW_ATTRIBUTE = 0x00000002, SHOW_TEXT = 0x00000004,   SHOW_CDATA_SECTION = 0x00000008, SHOW_ENTITY_REFERENCE = 0x00000010, SHOW_ENTITY = 0x00000020, SHOW_PROCESSING_INSTRUCTION = 0x00000040,   SHOW_COMMENT = 0x00000080, SHOW_DOCUMENT = 0x00000100, SHOW_DOCUMENT_TYPE = 0x00000200, SHOW_DOCUMENT_FRAGMENT = 0x00000400,   SHOW_NOTATION = 0x00000800 }

Public Member Functions
	NodeFilter ()
	NodeFilter (const NodeFilter &other)
	NodeFilter (NodeFilterImpl *i)
virtual	~NodeFilter ()
virtual short	acceptNode (const Node &n)
CustomNodeFilter *	customNodeFilter ()
virtual NodeFilterImpl *	handle () const
virtual bool	isNull () const
virtual NodeFilter &	operator= (const NodeFilter &other)
void	setCustomNodeFilter (CustomNodeFilter *custom)

Static Public Member Functions
static NodeFilter	createCustom (CustomNodeFilter *custom)

Protected Attributes
NodeFilterImpl *	impl

Detailed Description

Filters are objects that know how to "filter out" nodes.

If an Iterator or TreeWalker is given a filter, before it returns the next node, it applies the filter. If the filter says to accept the node, the Iterator returns it; otherwise, the Iterator looks for the next node and pretends that the node that was rejected was not there.

The DOM does not provide any filters. Filter is just an interface that users can implement to provide their own filters.

Filters do not need to know how to iterate, nor do they need to know anything about the data structure that is being iterated. This makes it very easy to write filters, since the only thing they have to know how to do is evaluate a single node. One filter may be used with a number of different kinds of Iterators, encouraging code reuse.

To create your own custom NodeFilter, define a subclass of CustomNodeFilter which overrides the acceptNode() method and assign an instance of it to the NodeFilter. For more details see the CustomNodeFilter class

Definition at line 183 of file dom2_traversal.h.

Member Enumeration Documentation

enum DOM::NodeFilter::AcceptCode

The following constants are returned by the acceptNode() method:

Enumerator
FILTER_ACCEPT
FILTER_REJECT
FILTER_SKIP

Definition at line 203 of file dom2_traversal.h.

enum DOM::NodeFilter::ShowCode

These are the available values for the whatToShow parameter.

They are the same as the set of possible types for Node, and their values are derived by using a bit position corresponding to the value of NodeType for the equivalent node type.

Enumerator
SHOW_ALL
SHOW_ELEMENT
SHOW_ATTRIBUTE
SHOW_TEXT
SHOW_CDATA_SECTION
SHOW_ENTITY_REFERENCE
SHOW_ENTITY
SHOW_PROCESSING_INSTRUCTION
SHOW_COMMENT
SHOW_DOCUMENT
SHOW_DOCUMENT_TYPE
SHOW_DOCUMENT_FRAGMENT
SHOW_NOTATION

Definition at line 216 of file dom2_traversal.h.

Constructor & Destructor Documentation

NodeFilter::NodeFilter

(

)

Definition at line 137 of file dom2_traversal.cpp.

NodeFilter::NodeFilter

(

const NodeFilter &

other

)

Definition at line 142 of file dom2_traversal.cpp.

NodeFilter::NodeFilter

(

NodeFilterImpl *

i

)

Definition at line 148 of file dom2_traversal.cpp.

NodeFilter::~NodeFilter ( )

virtual

Definition at line 164 of file dom2_traversal.cpp.

Member Function Documentation

short NodeFilter::acceptNode ( const Node &  n )

virtual

Test whether a specified node is visible in the logical view of a TreeWalker or NodeIterator.

This function will be called by the implementation of TreeWalker and NodeIterator; it is not intended to be called directly from user code.

Parameters

n	The node to check to see if it passes the filter or not.

Returns

a constant to determine whether the node is accepted, rejected, or skipped, as defined above .

Definition at line 169 of file dom2_traversal.cpp.

NodeFilter NodeFilter::createCustom ( CustomNodeFilter *  custom )

static

Definition at line 197 of file dom2_traversal.cpp.

CustomNodeFilter * NodeFilter::customNodeFilter

(

)

Definition at line 181 of file dom2_traversal.cpp.

NodeFilterImpl * NodeFilter::handle ( ) const

virtual

not part of the DOM

Definition at line 187 of file dom2_traversal.cpp.

bool NodeFilter::isNull ( ) const

virtual

Definition at line 192 of file dom2_traversal.cpp.

NodeFilter & NodeFilter::operator= ( const NodeFilter &  other )

virtual

Definition at line 154 of file dom2_traversal.cpp.

void NodeFilter::setCustomNodeFilter

(

CustomNodeFilter *

custom

)

Definition at line 176 of file dom2_traversal.cpp.

Member Data Documentation

NodeFilterImpl* DOM::NodeFilter::impl

protected

Definition at line 260 of file dom2_traversal.h.

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

• dom2_traversal.h
• dom2_traversal.cpp