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 Description

AccumulatorData(Accumulator acc)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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