Package org.apache.xml.dtm.ref
Class DTMNodeIterator
java.lang.Object
org.apache.xml.dtm.ref.DTMNodeIterator
- All Implemented Interfaces:
org.w3c.dom.traversal.NodeIterator
DTMNodeIterator
gives us an implementation of the
DTMNodeIterator which returns DOM nodes.
Please note that this is not necessarily equivlaent to a DOM
NodeIterator operating over the same document. In particular:
- If there are several Text nodes in logical succession (ie, across CDATASection and EntityReference boundaries), we will return only the first; the caller is responsible for stepping through them. (%REVIEW% Provide a convenience routine here to assist, pending proposed DOM Level 3 getAdjacentText() operation?)
- Since the whole XPath/XSLT architecture assumes that the source document is not altered while we're working with it, we do not promise to implement the DOM NodeIterator's "maintain current position" response to document mutation.
- Since our design for XPath NodeIterators builds a stateful filter directly into the traversal object, getNodeFilter() is not supported.
State: In progress!!
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Constructor Summary
ConstructorsConstructorDescriptionDTMNodeIterator
(DTMIterator dtmIterator) Public constructor: Wrap a DTMNodeIterator around an existing and preconfigured DTMIterator -
Method Summary
Modifier and TypeMethodDescriptionvoid
detach()
Detaches the NodeIterator from the set which it iterated over, releasing any computational resources and placing the iterator in the INVALID state.Access the wrapped DTMIterator.boolean
The value of this flag determines whether the children of entity reference nodes are visible to the iterator.org.w3c.dom.traversal.NodeFilter
Return a handle to the filter used to screen nodes.getRoot()
int
Return a mask describing which node types are presented via the iterator.nextNode()
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Constructor Details
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DTMNodeIterator
Public constructor: Wrap a DTMNodeIterator around an existing and preconfigured DTMIterator
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Method Details
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getDTMIterator
Access the wrapped DTMIterator. I'm not sure whether anyone will need this or not, but let's write it and think about it. -
detach
public void detach()Detaches the NodeIterator from the set which it iterated over, releasing any computational resources and placing the iterator in the INVALID state.- Specified by:
detach
in interfaceorg.w3c.dom.traversal.NodeIterator
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getExpandEntityReferences
public boolean getExpandEntityReferences()The value of this flag determines whether the children of entity reference nodes are visible to the iterator.- Specified by:
getExpandEntityReferences
in interfaceorg.w3c.dom.traversal.NodeIterator
- Returns:
- false, always (the DTM model flattens entity references)
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getFilter
public org.w3c.dom.traversal.NodeFilter getFilter()Return a handle to the filter used to screen nodes. This is ill-defined in Xalan's usage of Nodeiterator, where we have built stateful XPath-based filtering directly into the traversal object. We could return something which supports the NodeFilter interface and allows querying whether a given node would be permitted if it appeared as our next node, but in the current implementation that would be very complex -- and just isn't all that useful.- Specified by:
getFilter
in interfaceorg.w3c.dom.traversal.NodeIterator
- Throws:
DOMException
- -- NOT_SUPPORTED_ERROR because I can't think of anything more useful to do in this case
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getRoot
- Specified by:
getRoot
in interfaceorg.w3c.dom.traversal.NodeIterator
- Returns:
- The root node of the NodeIterator, as specified when it was created.
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getWhatToShow
public int getWhatToShow()Return a mask describing which node types are presented via the iterator.- Specified by:
getWhatToShow
in interfaceorg.w3c.dom.traversal.NodeIterator
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nextNode
- Specified by:
nextNode
in interfaceorg.w3c.dom.traversal.NodeIterator
- Returns:
- the next node in the set and advance the position of the iterator in the set.
- Throws:
DOMException
- - INVALID_STATE_ERR Raised if this method is called after the detach method was invoked.
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previousNode
- Specified by:
previousNode
in interfaceorg.w3c.dom.traversal.NodeIterator
- Returns:
- the next previous in the set and advance the position of the iterator in the set.
- Throws:
DOMException
- - INVALID_STATE_ERR Raised if this method is called after the detach method was invoked.
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