Package org.apache.xml.dtm.ref

Class DTMTreeWalker

java.lang.Object
org.apache.xml.dtm.ref.DTMTreeWalker
Direct Known Subclasses:
TreeWalker2Result
public class DTMTreeWalker
extends 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 Details

    • m_dtm

      protected DTM m_dtm
      DomHelper for this TreeWalker

  • 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

    • setDTM

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

    • 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)
      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 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
      SAXException

    • traverse

      public void traverse​(int pos, int top) throws 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
      SAXException

    • startNode

      protected void startNode​(int node) throws SAXException
      Start processing given node
      Parameters:
      node - Node to process
      Throws:
      SAXException

    • endNode

      protected void endNode​(int node) throws SAXException
      End processing of given node
      Parameters:
      node - Node we just finished processing
      Throws:
      SAXException