Java Doc for DeepNodeListImpl.java in  » XML » xerces-2_9_1 » org » apache » xerces » dom » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » xerces 2_9_1 » org.apache.xerces.dom 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.apache.xerces.dom.DeepNodeListImpl

All known Subclasses:   org.apache.html.dom.NameNodeListImpl,
DeepNodeListImpl
public class DeepNodeListImpl implements NodeList(Code)
This class implements the DOM's NodeList behavior for Element.getElementsByTagName()

The DOM describes NodeList as follows:

1) It may represent EITHER nodes scattered through a subtree (when returned by Element.getElementsByTagName), or just the immediate children (when returned by Node.getChildNodes). The latter is easy, but the former (which this class addresses) is more challenging.

2) Its behavior is "live" -- that is, it always reflects the current state of the document tree. To put it another way, the NodeLists obtained before and after a series of insertions and deletions are effectively identical (as far as the user is concerned, the former has been dynamically updated as the changes have been made).

3) Its API accesses individual nodes via an integer index, with the listed nodes numbered sequentially in the order that they were found during a preorder depth-first left-to-right search of the tree. (Of course in the case of getChildNodes, depth is not involved.) As nodes are inserted or deleted in the tree, and hence the NodeList, the numbering of nodes that follow them in the NodeList will change.

It is rather painful to support the latter two in the getElementsByTagName case. The current solution is for Nodes to maintain a change count (eventually that may be a Digest instead), which the NodeList tracks and uses to invalidate itself.

Unfortunately, this does _not_ respond efficiently in the case that the dynamic behavior was supposed to address: scanning a tree while it is being extended. That requires knowing which subtrees have changed, which can become an arbitrarily complex problem.

We save some work by filling the vector only as we access the item()s... but I suspect the same users who demanded index-based access will also start by doing a getLength() to control their loop, blowing this optimization out of the water.

NOTE: Level 2 of the DOM will probably _not_ use NodeList for its extended search mechanisms, partly for the reasons just discussed.
version:
   $Id: DeepNodeListImpl.java 447266 2006-09-18 05:57:49Z mrglavas $
since:
   PR-DOM-Level-1-19980818.



Field Summary
protected  intchanges
    
protected  booleanenableNS
    
protected  Vectornodes
    
protected  StringnsName
    
protected  NodeImplrootNode
    
protected  StringtagName
    

Constructor Summary
public  DeepNodeListImpl(NodeImpl rootNode, String tagName)
     Constructor.
public  DeepNodeListImpl(NodeImpl rootNode, String nsName, String tagName)
     Constructor for Namespace support.

Method Summary
public  intgetLength()
     Returns the length of the node list.
public  Nodeitem(int index)
     Returns the node at the specified index.
protected  NodenextMatchingElementAfter(Node current)
     Iterative tree-walker.

Field Detail
changes
protected int changes(Code)



enableNS
protected boolean enableNS(Code)



nodes
protected Vector nodes(Code)



nsName
protected String nsName(Code)



rootNode
protected NodeImpl rootNode(Code)



tagName
protected String tagName(Code)




Constructor Detail
DeepNodeListImpl
public DeepNodeListImpl(NodeImpl rootNode, String tagName)(Code)
Constructor.



DeepNodeListImpl
public DeepNodeListImpl(NodeImpl rootNode, String nsName, String tagName)(Code)
Constructor for Namespace support.




Method Detail
getLength
public int getLength()(Code)
Returns the length of the node list.



item
public Node item(int index)(Code)
Returns the node at the specified index.



nextMatchingElementAfter
protected Node nextMatchingElementAfter(Node current)(Code)
Iterative tree-walker. When you have a Parent link, there's often no need to resort to recursion. NOTE THAT only Element nodes are matched since we're specifically supporting getElementsByTagName().



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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