Package net.sf.saxon.expr.flwor

## Class SingularityPull

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

-     public class SingularityPull
      extends TuplePull

  The "singularity" tuple stream delivers a single empty tuple. It is the base tuple stream for the outermost for/let clause in a FLWOR expression

- - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `SingularityPull()` |

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `boolean` | `nextTuple​(XPathContext context)` | Move on to the next tuple.

    - ### Methods inherited from class net.sf.saxon.expr.flwor.TuplePull

      `close`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### SingularityPull

          public SingularityPull()

  - ### Method Detail

    - #### nextTuple

          public boolean nextTuple​(XPathContext context)

      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.