AccumulatorRule

java.lang.Object
- net.sf.saxon.expr.accum.AccumulatorRule

All Implemented Interfaces:

RuleTarget
```
public class AccumulatorRule
extends java.lang.Object
implements RuleTarget
```
This class represents one of the rules making up the definition of an accumulator

Constructor Summary

Constructors
Constructor Description

AccumulatorRule(Expression newValueExpression, SlotManager stackFrameMap, boolean postDescent)
Create a rule

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`export(ExpressionPresenter out)`	Output diagnostic explanation to an ExpressionPresenter
`Expression`	`getNewValueExpression()`
`SlotManager`	`getStackFrameMap()`
`boolean`	`isCapturing()`
`boolean`	`isPostDescent()`
`void`	`registerRule(Rule rule)`	Register a rule for which this is the target
`void`	`setCapturing(boolean capturing)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - AccumulatorRule
```
public AccumulatorRule(Expression newValueExpression,
                       SlotManager stackFrameMap,
                       boolean postDescent)
```
    Create a rule
    
    Parameters:
    
    newValueExpression - the expression that computes a new value of the accumulator function
    
    stackFrameMap - the stack frame used to evaluate this expression
- Method Detail
  - getNewValueExpression
```
public Expression getNewValueExpression()
```
  - export
```
public void export(ExpressionPresenter out)
            throws XPathException
```
    Description copied from interface: RuleTarget
    
    Output diagnostic explanation to an ExpressionPresenter
    
    Specified by:
    
    export in interface RuleTarget
    
    Parameters:
    
    out - the destination for the explanation
    
    Throws:
    
    XPathException - if output fails
  - getStackFrameMap
```
public SlotManager getStackFrameMap()
```
  - registerRule
```
public void registerRule(Rule rule)
```
    Register a rule for which this is the target
    
    Specified by:
    
    registerRule in interface RuleTarget
    
    Parameters:
    
    rule - a rule in which this is the target
  - setCapturing
```
public void setCapturing(boolean capturing)
```
  - isCapturing
```
public boolean isCapturing()
```
  - isPostDescent
```
public boolean isPostDescent()
```