net.sf.saxon.tinytree
Class TinyTreeEventIterator

java.lang.Object
  net.sf.saxon.tinytree.TinyTreeEventIterator

All Implemented Interfaces:

LocationProvider, EventIterator, PullEvent

public class TinyTreeEventIterator
extends Object
implements EventIterator, LocationProvider

This implementation of the Saxon event-pull interface starts from a document, element, text, comment, or processing-instruction node in a TinyTree, and returns the events corresponding to that node and its descendants (including their attributes and namespaces). The class performs the same function as the general-purpose Decomposer class, but is specialized to exploit the TinyTree data structure: in particular, it never materializes any Node objects.

Constructor Summary

TinyTreeEventIterator(TinyNodeImpl startNode, PipelineConfiguration pipe)
Create a TinyTreeEventIterator to return events associated with a tree or subtree

Method Summary

int	getColumnNumber(long locationId) Get location information: the column number of the current start element event
int	getLineNumber(long locationId) Get location information: the line number of the current start element event
String	getSystemId(long locationId) Get location information: the system Id of the current start element event
boolean	isFlatSequence() Determine whether the EventIterator returns a flat sequence of events, or whether it can return nested event iterators
PullEvent	next() Get the next event

Methods inherited from class java.lang.Object

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

Constructor Detail

TinyTreeEventIterator

public TinyTreeEventIterator(TinyNodeImpl startNode,
                             PipelineConfiguration pipe)

Create a TinyTreeEventIterator to return events associated with a tree or subtree

Parameters:

startNode - the root of the tree or subtree. Must be a document or element node.

pipe - the Saxon pipeline configuration

Throws:

IllegalArgumentException - if the start node is an attribute or namespace node.

Method Detail

next

public PullEvent next()
               throws XPathException

Get the next event

Specified by:

next in interface EventIterator

Returns:

a PullEvent object representing the next event, or null when the sequence is exhausted

Throws:

XPathException - if a dynamic evaluation error occurs

isFlatSequence

public boolean isFlatSequence()

Determine whether the EventIterator returns a flat sequence of events, or whether it can return nested event iterators

Specified by:

isFlatSequence in interface EventIterator

Returns:

true if the next() method is guaranteed never to return an EventIterator

getSystemId

public String getSystemId(long locationId)

Get location information: the system Id of the current start element event

Specified by:

getSystemId in interface LocationProvider

Parameters:

locationId - in this case, the node number in the tiny tree

Returns:

the system Id of the node: that is its base URI, before taking xml:base into account

getLineNumber

public int getLineNumber(long locationId)

Get location information: the line number of the current start element event

Specified by:

getLineNumber in interface LocationProvider

Parameters:

locationId - in this case, the node number in the tiny tree

Returns:

the line number of the node if known, or -1 otherwise

getColumnNumber

public int getColumnNumber(long locationId)

Get location information: the column number of the current start element event

Specified by:

getColumnNumber in interface LocationProvider

Parameters:

locationId - in this case, the node number in the tiny tree

Returns:

the column number of the node if known, or -1 otherwise