org.apache.xml.dtm.ref

Class DTMTreeWalker

Known Direct Subclasses:
TreeWalker2Result

public class DTMTreeWalker
extends java.lang.Object

This class does a pre-order walk of the DTM tree, calling a ContentHandler interface as it goes. As such, it's more like the Visitor design pattern than like the DOM's TreeWalker. I think normally this class should not be needed, because of DTM#dispatchToEvents.

Constructor Summary

DTMTreeWalker()
Constructor.
DTMTreeWalker(ContentHandler contentHandler, DTM dtm)
Constructor.

Method Summary

ContentHandler
getcontentHandler()
Get the ContentHandler used for the tree walk.
void
setDTM(DTM dtm)
Set the DTM to be traversed.
void
setcontentHandler(ContentHandler ch)
Set the ContentHandler used for the tree walk.
void
traverse(int pos)
Perform a non-recursive pre-order/post-order traversal, operating as a Visitor. startNode (preorder) and endNode (postorder) are invoked for each node as we traverse over them, with the result that the node is written out to m_contentHandler.
void
traverse(int pos, int top)
Perform a non-recursive pre-order/post-order traversal, operating as a Visitor. startNode (preorder) and endNode (postorder) are invoked for each node as we traverse over them, with the result that the node is written out to m_contentHandler.

Constructor Details

DTMTreeWalker

public DTMTreeWalker()
Constructor.

DTMTreeWalker

public DTMTreeWalker(ContentHandler contentHandler,
                     DTM dtm)
Constructor.
Parameters:
contentHandler - The implemention of the contentHandler operation (toXMLString, digest, ...)

Method Details

getcontentHandler

public ContentHandler getcontentHandler()
Get the ContentHandler used for the tree walk.
Returns:
the ContentHandler used for the tree walk

setDTM

public void setDTM(DTM dtm)
Set the DTM to be traversed.
Parameters:
dtm - The Document Table Model to be used.

setcontentHandler

public void setcontentHandler(ContentHandler ch)
Set the ContentHandler used for the tree walk.
Parameters:
ch - the ContentHandler to be the result of the tree walk.

traverse

public void traverse(int pos)
            throws org.xml.sax.SAXException
Perform a non-recursive pre-order/post-order traversal, operating as a Visitor. startNode (preorder) and endNode (postorder) are invoked for each node as we traverse over them, with the result that the node is written out to m_contentHandler.
Parameters:
pos - Node in the tree at which to start (and end) traversal -- in other words, the root of the subtree to traverse over.

traverse

public void traverse(int pos,
                     int top)
            throws org.xml.sax.SAXException
Perform a non-recursive pre-order/post-order traversal, operating as a Visitor. startNode (preorder) and endNode (postorder) are invoked for each node as we traverse over them, with the result that the node is written out to m_contentHandler.
Parameters:
pos - Node in the tree where to start traversal
top - Node in the tree where to end traversal. If top==DTM.NULL, run through end of document.

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