Package net.sf.saxon.expr.flwor

## Class 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`

    - #### close

          public void close()

      Close the tuple stream, indicating that no more tuples will be supplied
      Overrides:
        `close` in class `TuplePull`