WindowClausePull

java.lang.Object
- net.sf.saxon.expr.flwor.TuplePull
- - net.sf.saxon.expr.flwor.WindowClausePull

```
public class WindowClausePull
extends TuplePull
```
Implement a sliding or tumbling window clause of a FLWOR expression in tuple-pull mode. The entire window processing is activated once for each input tuple, and it generates one output tuple for each identified window.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`close()`	Close the tuple stream, indicating that no more tuples will be supplied
`boolean`	`nextTuple(XPathContext context)`	Move on to the next tuple.

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

- Method Detail
  - nextTuple
```
public boolean nextTuple(XPathContext context)
                  throws XPathException
```
    Move on to the next tuple. Before returning, this method must set all the variables corresponding to the "returned" tuple in the local stack frame associated with the context object
    
    Specified by:
    
    nextTuple in class TuplePull
    
    Parameters:
    
    context - the dynamic evaluation context
    
    Returns:
    
    true if another tuple has been generated; false if the tuple stream is exhausted. If the method returns false, the values of the local variables corresponding to this tuple stream are undefined.
    
    Throws:
    
    XPathException - if any error occurs
  - close
```
public void close()
```
    Close the tuple stream, indicating that no more tuples will be supplied
    
    Overrides:
    
    close in class TuplePull