XML::DOM::NamedNodeMapUser Contributed Perl DocumentaXML::DOM::NamedNodeMap(3)NAMEXML::DOM::NamedNodeMap - A hash table interface for XML::DOM
DESCRIPTION
Objects implementing the NamedNodeMap interface are used to represent
collections of nodes that can be accessed by name. Note that
NamedNodeMap does not inherit from NodeList; NamedNodeMaps are not
maintained in any particular order. Objects contained in an object
implementing NamedNodeMap may also be accessed by an ordinal index, but
this is simply to allow convenient enumeration of the contents of a
NamedNodeMap, and does not imply that the DOM specifies an order to
these Nodes.
Note that in this implementation, the objects added to a NamedNodeMap
are kept in order.
METHODS
getNamedItem (name)
Retrieves a node specified by name.
Return Value: A Node (of any type) with the specified name, or
undef if the specified name did not identify any node in the map.
setNamedItem (arg)
Adds a node using its nodeName attribute.
As the nodeName attribute is used to derive the name which the node
must be stored under, multiple nodes of certain types (those that
have a "special" string value) cannot be stored as the names would
clash. This is seen as preferable to allowing nodes to be aliased.
Parameters:
arg A node to store in a named node map.
The node will later be accessible using the value of the nodeName
attribute of the node. If a node with that name is already present
in the map, it is replaced by the new one.
Return Value: If the new Node replaces an existing node with the
same name the previously existing Node is returned, otherwise undef
is returned.
DOMExceptions:
* WRONG_DOCUMENT_ERR
Raised if arg was created from a different document than the
one that created the NamedNodeMap.
* NO_MODIFICATION_ALLOWED_ERR
Raised if this NamedNodeMap is readonly.
* INUSE_ATTRIBUTE_ERR
Raised if arg is an Attr that is already an attribute of
another Element object. The DOM user must explicitly clone
Attr nodes to re-use them in other elements.
removeNamedItem (name)
Removes a node specified by name. If the removed node is an Attr
with a default value it is immediately replaced.
Return Value: The node removed from the map or undef if no node
with such a name exists.
DOMException:
* NOT_FOUND_ERR
Raised if there is no node named name in the map.
item (index)
Returns the indexth item in the map. If index is greater than or
equal to the number of nodes in the map, this returns undef.
Return Value: The node at the indexth position in the NamedNodeMap,
or undef if that is not a valid index.
getLength
Returns the number of nodes in the map. The range of valid child
node indices is 0 to length-1 inclusive.
Additional methods not in the DOM Spec
getValues
Returns a NodeList with the nodes contained in the NamedNodeMap.
The NodeList is "live", in that it reflects changes made to the
NamedNodeMap.
When this method is called in a list context, it returns a regular
perl list containing the values. Note that this list is not "live".
E.g.
@list = $map->getValues; # returns a perl list
$nodelist = $map->getValues; # returns a NodeList (object ref.)
for my $val ($map->getValues) # iterate over the values
getChildIndex (node)
Returns the index of the node in the NodeList as returned by get-
Values, or -1 if the node is not in the NamedNodeMap.
dispose
Removes all circular references in this NamedNodeMap and its
descendants so the objects can be claimed for garbage collection.
The objects should not be used afterwards.
perl v5.8.8 2002-02-09 XML::DOM::NamedNodeMap(3)
