org.w3c.dom.traversal
Interface NodeIterator

All Known Implementing Classes:

NodeIteratorImpl

public interface NodeIterator

NodeIterators are used to step through a set of nodes, e.g. the set of nodes in a NodeList, the document subtree governed by a particular node, the results of a query, or any other set of nodes. The set of nodes to be iterated is determined by the implementation of the NodeIterator. DOM Level 2 specifies a single NodeIterator implementation for document-order traversal of a document subtree. Instances of these iterators are created by calling DocumentTraversal.createNodeIterator().

Since:

DOM Level 2

Method Summary

void	detach() Detaches the iterator from the set which it iterated over, releasing any computational resources and placing the iterator in the INVALID state.
boolean	getExpandEntityReferences() The value of this flag determines whether the children of entity reference nodes are visible to the iterator.
NodeFilter	getFilter() The filter used to screen nodes.
Node	getRoot() The root node of the Iterator, as specified when it was created.
int	getWhatToShow() This attribute determines which node types are presented via the iterator.
Node	nextNode() Returns the next node in the set and advances the position of the iterator in the set.
Node	previousNode() Returns the previous node in the set and moves the position of the iterator backwards in the set.

Method Detail

getRoot

public Node getRoot()

The root node of the Iterator, as specified when it was created.

getWhatToShow

public int getWhatToShow()

This attribute determines which node types are presented via the iterator. The available set of constants is defined in the NodeFilter interface.

getFilter

public NodeFilter getFilter()

The filter used to screen nodes.

getExpandEntityReferences

public boolean getExpandEntityReferences()

The value of this flag determines whether the children of entity reference nodes are visible to the iterator. If false, they will be skipped over.
To produce a view of the document that has entity references expanded and does not expose the entity reference node itself, use the whatToShow flags to hide the entity reference node and set expandEntityReferences to true when creating the iterator. To produce a view of the document that has entity reference nodes but no entity expansion, use the whatToShow flags to show the entity reference node and set expandEntityReferences to false.

nextNode

public Node nextNode()
              throws DOMException

Returns the next node in the set and advances the position of the iterator in the set. After a NodeIterator is created, the first call to nextNode() returns the first node in the set.

Returns:

The next Node in the set being iterated over, or null if there are no more members in that set.

Throws:

DOMException - INVALID_STATE_ERR: Raised if this method is called after the detach method was invoked.

previousNode

public Node previousNode()
                  throws DOMException

Returns the previous node in the set and moves the position of the iterator backwards in the set.

Returns:

The previous Node in the set being iterated over, ornull if there are no more members in that set.

Throws:

DOMException - INVALID_STATE_ERR: Raised if this method is called after the detach method was invoked.

detach

public void detach()

Detaches the iterator from the set which it iterated over, releasing any computational resources and placing the iterator in the INVALID state. Afterdetach has been invoked, calls to nextNode orpreviousNode will raise the exception INVALID_STATE_ERR.