Represents the tuple stream delivered by an "group by" clause. This groups the tuple stream supplied
as its input, and outputs a new set of tuples one per group of the input tuples. No groups are output
until all the groups have been read.
All Methods Instance Methods Concrete Methods
Modifier and Type
Method and Description
Close the tuple stream, indicating that although not all tuples have been read,
no further tuples are required and resources can be released
( 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
public boolean nextTuple(
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
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
- if any error occurs
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