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java.lang.Objectorg.jaxen.util.PrecedingAxisIterator
public class PrecedingAxisIterator
Represents the XPath preceding axis.
The "preceding axis contains all nodes in the same document as the context
node that are before the context node in document order, excluding any ancestors
and excluding attribute nodes and namespace nodes."
This implementation of 'preceding' works like so:
the preceding axis includes preceding siblings of this node and
their descendants. Also, for each ancestor node of this node, it includes
all preceding siblings of that ancestor, and their descendants. Finally, it
includes the ancestor nodes themselves.
The reversed descendant-or-self axes that are required are calculated using a
stack of reversed 'child-or-self' axes. When asked for a node, it is always taken
from a child-or-self axis. If it was the last node on that axis, the node is returned.
Otherwise, this axis is pushed on the stack, and the process is repeated with the child-or-self
of the node. Eventually this recurses down to the last descendant of any node, then works
back up to the root.
Most object models could provide a faster implementation of the reversed 'children-or-self' used here.
| Constructor Summary | |
|---|---|
PrecedingAxisIterator(Object contextNode,
Navigator navigator)
Create a new preceding axis iterator. |
|
| Method Summary | |
|---|---|
boolean |
hasNext()
Returns true if there are any preceding nodes remaining; false otherwise. |
Object |
next()
Returns the next preceding node. |
void |
remove()
This operation is not supported. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public PrecedingAxisIterator(Object contextNode,
Navigator navigator)
throws UnsupportedAxisException
preceding axis iterator.
contextNode - the node to start fromnavigator - the object model specific navigator
UnsupportedAxisException| Method Detail |
|---|
public boolean hasNext()
hasNext in interface IteratorIterator.hasNext()
public Object next()
throws NoSuchElementException
next in interface IteratorNoSuchElementException - if no preceding nodes remainIterator.next()
public void remove()
throws UnsupportedOperationException
remove in interface IteratorUnsupportedOperationException - always
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