net.sf.saxon.expr.accum

Class AccumulatorData

java.lang.Object

net.sf.saxon.expr.accum.AccumulatorData

All Implemented Interfaces:

IAccumulatorData

public class AccumulatorData
extends java.lang.Object
implements IAccumulatorData

Holds the values of an accumulator function for one non-streamed document

Constructor Summary

Constructors

Constructor and Description
AccumulatorData(Accumulator acc)

Method Summary

Modifier and Type	Method and Description
void	buildIndex(NodeInfo doc, XPathContext context) Build a data structure containing the values of the accumulator for each node in a document.
Accumulator	getAccumulator() Get the associated accumulator
Sequence	getValue(NodeInfo node, boolean postDescent) Get the value of the accumulator for a given node

Methods inherited from class java.lang.Object

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

Constructor Detail

AccumulatorData

public AccumulatorData(Accumulator acc)

Method Detail

getAccumulator

public Accumulator getAccumulator()

Get the associated accumulator

Specified by:

getAccumulator in interface IAccumulatorData

Returns:

the accumulator

buildIndex

public void buildIndex(NodeInfo doc,
                       XPathContext context)
                throws XPathException

Build a data structure containing the values of the accumulator for each node in a document. The data structure holds the value for all nodes where the value changes; the value for other nodes is obtained by interpolation

Parameters:

doc - the root of the tree for which the accumulator is to be evaluated

context - the dynamic evaluation context

Throws:

XPathException - if a dynamic error occurs while evaluating the accumulator

getValue

public Sequence getValue(NodeInfo node,
                         boolean postDescent)

Get the value of the accumulator for a given node

Specified by:

getValue in interface IAccumulatorData

Parameters:

node - the node in question

postDescent - false if the pre-descent value of the accumulator is required; false if the post-descent value is wanted.

Returns:

the value of the accumulator for this node