org.apache.xml.dtm.ref
Class DTMTreeWalker

java.lang.Object
  org.apache.xml.dtm.ref.DTMTreeWalker

Direct Known 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.

Field Summary

private org.xml.sax.ContentHandler	m_contentHandler Local reference to a ContentHandler
protected DTM	m_dtm DomHelper for this TreeWalker
(package private) boolean	nextIsRaw Flag indicating whether following text to be processed is raw text

Constructor Summary

DTMTreeWalker()
Constructor.

DTMTreeWalker(org.xml.sax.ContentHandler contentHandler, DTM dtm)
Constructor.

Method Summary

private void	dispatachChars(int node) Optimized dispatch of characters.
protected void	endNode(int node) End processing of given node
org.xml.sax.ContentHandler	getcontentHandler() Get the ContentHandler used for the tree walk.
void	setcontentHandler(org.xml.sax.ContentHandler ch) Set the ContentHandler used for the tree walk.
void	setDTM(DTM dtm) Set the DTM to be traversed.
protected void	startNode(int node) Start processing given node
void	traverse(int pos) Perform a non-recursive pre-order/post-order traversal, operating as a Visitor.
void	traverse(int pos, int top) Perform a non-recursive pre-order/post-order traversal, operating as a Visitor.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

m_contentHandler

private org.xml.sax.ContentHandler m_contentHandler

Local reference to a ContentHandler

m_dtm

protected DTM m_dtm

DomHelper for this TreeWalker

nextIsRaw

boolean nextIsRaw

Flag indicating whether following text to be processed is raw text

Constructor Detail

DTMTreeWalker

public DTMTreeWalker()

Constructor.

DTMTreeWalker

public DTMTreeWalker(org.xml.sax.ContentHandler contentHandler,
                     DTM dtm)

Constructor.

Parameters:

contentHandler - The implemention of the contentHandler operation (toXMLString, digest, ...)

Method Detail

setDTM

public void setDTM(DTM dtm)

Set the DTM to be traversed.

Parameters:

dtm - The Document Table Model to be used.

getcontentHandler

public org.xml.sax.ContentHandler getcontentHandler()

Get the ContentHandler used for the tree walk.

Returns:

the ContentHandler used for the tree walk

setcontentHandler

public void setcontentHandler(org.xml.sax.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.

Throws:

TransformerException

org.xml.sax.SAXException

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.

Throws:

TransformerException

org.xml.sax.SAXException

dispatachChars

private final void dispatachChars(int node)
                           throws org.xml.sax.SAXException

Optimized dispatch of characters.

Throws:

org.xml.sax.SAXException

startNode

protected void startNode(int node)
                  throws org.xml.sax.SAXException

Start processing given node

Parameters:

node - Node to process

Throws:

org.xml.sax.SAXException

endNode

protected void endNode(int node)
                throws org.xml.sax.SAXException

End processing of given node

Parameters:

node - Node we just finished processing

Throws:

org.xml.sax.SAXException