Sum.SumFold

java.lang.Object
- net.sf.saxon.functions.Sum.SumFold

All Implemented Interfaces:

Fold

Enclosing class:

Sum
```
public static class Sum.SumFold
extends java.lang.Object
implements Fold
```
Implementation of Fold class to do the summation in push mode

Constructor Summary

Constructors
Constructor Description

SumFold(XPathContext context, AtomicValue zeroValue)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`isFinished()`	Ask whether the computation has completed.
`void`	`processItem(Item item)`	Process one item in the input sequence, returning a new copy of the working data
`Sequence`	`result()`	Compute the final result of the function, when all the input has been processed

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

- Constructor Detail
  - SumFold
```
public SumFold(XPathContext context,
               AtomicValue zeroValue)
```
- Method Detail
  - processItem
```
public void processItem(Item item)
                 throws XPathException
```
    Process one item in the input sequence, returning a new copy of the working data
    
    Specified by:
    
    processItem in interface Fold
    
    Parameters:
    
    item - the item to be processed from the input sequence
    
    Throws:
    
    XPathException - if a dynamic error occurs
  - isFinished
```
public boolean isFinished()
```
    Ask whether the computation has completed. A function that can deliver its final result without reading the whole input should return true; this will be followed by a call on result() to deliver the final result.
    
    Specified by:
    
    isFinished in interface Fold
    
    Returns:
    
    true if the result of the function is now available even though not all items in the sequence have been processed
  - result
```
public Sequence result()
```
    Compute the final result of the function, when all the input has been processed
    
    Specified by:
    
    result in interface Fold
    
    Returns:
    
    the result of the function