org.apache.xalan.xsltc.dom
Class MultiValuedNodeHeapIterator

java.lang.Object
  |
  +--org.apache.xml.dtm.ref.DTMAxisIteratorBase
        |
        +--org.apache.xalan.xsltc.dom.MultiValuedNodeHeapIterator
Direct Known Subclasses:
KeyIndex.KeyIndexIterator, UnionIterator

public abstract class MultiValuedNodeHeapIterator
extends DTMAxisIteratorBase

MultiValuedNodeHeapIterator takes a set of multi-valued heap nodes and produces a merged NodeSet in document order with duplicates removed.

Each multi-valued heap node (which might be a DTMAxisIterator, but that's not necessary) generates DTM node handles in document order. The class maintains the multi-valued heap nodes in a heap, not surprisingly, sorted by the next DTM node handle available form the heap node.

After a DTM node is pulled from the heap node that's at the top of the heap, the heap node is advanced to the next DTM node handle it makes available, and the heap nature of the heap is restored to ensure the next DTM node handle pulled is next in document order overall.


Inner Class Summary
 class MultiValuedNodeHeapIterator.HeapNode
          An abstract representation of a set of nodes that will be retrieved in document order.
 
Constructor Summary
MultiValuedNodeHeapIterator()
           
 
Method Summary
 DTMAxisIterator cloneIterator()
           
 void gotoMark()
           
 int next()
           
 DTMAxisIterator reset()
           
 void setMark()
           
 DTMAxisIterator setStartNode(int node)
           
 
Methods inherited from class org.apache.xml.dtm.ref.DTMAxisIteratorBase
getAxis, getLast, getNodeByPosition, getPosition, getStartNode, includeSelf, isDocOrdered, isReverse, setRestartable
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

MultiValuedNodeHeapIterator

public MultiValuedNodeHeapIterator()
Method Detail

cloneIterator

public DTMAxisIterator cloneIterator()
Overrides:
cloneIterator in class DTMAxisIteratorBase

next

public int next()

setStartNode

public DTMAxisIterator setStartNode(int node)

setMark

public void setMark()

gotoMark

public void gotoMark()

reset

public DTMAxisIterator reset()
Overrides:
reset in class DTMAxisIteratorBase


Copyright 2006 Apache XML Project. All Rights Reserved.