org.apache.xml.utils

Class TreeWalker

java.lang.Object

org.apache.xml.utils.TreeWalker

public class TreeWalker
extends Object

This class does a pre-order walk of the DOM tree, calling a ContentHandler interface as it goes.

Field Summary

Fields

Modifier and Type	Field and Description
protected DOMHelper	m_dh DomHelper for this TreeWalker

Constructor Summary

Constructors

Constructor and Description
TreeWalker(ContentHandler contentHandler) Constructor.
TreeWalker(ContentHandler contentHandler, DOMHelper dh) Constructor.
TreeWalker(ContentHandler contentHandler, DOMHelper dh, String systemId) Constructor.

Method Summary

Modifier and Type	Method and Description
protected void	endNode(Node node) End processing of given node
ContentHandler	getContentHandler() Get the ContentHandler used for the tree walk.
void	setContentHandler(ContentHandler ch) Get the ContentHandler used for the tree walk.
protected void	startNode(Node node) Start processing given node
void	traverse(Node pos) Perform a pre-order traversal non-recursive style.
void	traverse(Node pos, Node top) Perform a pre-order traversal non-recursive style.
void	traverseFragment(Node pos) Perform a pre-order traversal non-recursive style.

Methods inherited from class java.lang.Object

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

Field Detail

m_dh

protected DOMHelper m_dh

DomHelper for this TreeWalker

Constructor Detail

TreeWalker

public TreeWalker(ContentHandler contentHandler,
                  DOMHelper dh,
                  String systemId)

Constructor.

Parameters:

contentHandler - The implemention of the

systemId - System identifier for the document. contentHandler operation (toXMLString, digest, ...)

TreeWalker

public TreeWalker(ContentHandler contentHandler,
                  DOMHelper dh)

Constructor.

Parameters:

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

TreeWalker

public TreeWalker(ContentHandler contentHandler)

Constructor.

Parameters:

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

Method Detail

getContentHandler

public ContentHandler getContentHandler()

Get the ContentHandler used for the tree walk.

Returns:

the ContentHandler used for the tree walk

setContentHandler

public void setContentHandler(ContentHandler ch)

Get the ContentHandler used for the tree walk.

traverse

public void traverse(Node pos)
              throws SAXException

Perform a pre-order traversal non-recursive style. Note that TreeWalker assumes that the subtree is intended to represent a complete (though not necessarily well-formed) document and, during a traversal, startDocument and endDocument will always be issued to the SAX listener.

Parameters:

pos - Node in the tree where to start traversal

Throws:

TransformerException

SAXException

traverseFragment

public void traverseFragment(Node pos)
                      throws SAXException

Perform a pre-order traversal non-recursive style. In contrast to the traverse() method this method will not issue startDocument() and endDocument() events to the SAX listener.

Parameters:

pos - Node in the tree where to start traversal

Throws:

TransformerException

SAXException

traverse

public void traverse(Node pos,
                     Node top)
              throws SAXException

Perform a pre-order traversal non-recursive style. Note that TreeWalker assumes that the subtree is intended to represent a complete (though not necessarily well-formed) document and, during a traversal, startDocument and endDocument will always be issued to the SAX listener.

Parameters:

pos - Node in the tree where to start traversal

top - Node in the tree where to end traversal

Throws:

TransformerException

SAXException

startNode

protected void startNode(Node node)
                  throws SAXException

Start processing given node

Parameters:

node - Node to process

Throws:

SAXException

endNode

protected void endNode(Node node)
                throws SAXException

End processing of given node

Parameters:

node - Node we just finished processing

Throws:

SAXException