Class 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.
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      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
      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 although not all tuples have been read, no further tuples are required and resources can be released
        Overrides:
        close in class TuplePull