Class WhileClausePull

java.lang.Object
net.sf.saxon.expr.flwor.TuplePull
net.sf.saxon.expr.flwor.WhileClausePull

public class WhileClausePull extends TuplePull
This class represents the tuple stream delivered as the output of a while clause in a FLWOR expression: that is, it returns all the tuples in its input stream that satisfy a specified predicate, until it finds one that doesn't. It does not change the values of any variables in the tuple stream.
  • Constructor Details

  • Method Details

    • 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 although not all tuples have been read, no further tuples are required and resources can be released
      Overrides:
      close in class TuplePull