Package net.sf.saxon.expr.flwor
Class WhileClausePull
java.lang.Object
net.sf.saxon.expr.flwor.TuplePull
net.sf.saxon.expr.flwor.WhileClausePull
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.
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionvoid
close()
Close the tuple stream, indicating that although not all tuples have been read, no further tuples are required and resources can be releasedboolean
nextTuple
(XPathContext context) Move on to the next tuple.
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Constructor Details
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WhileClausePull
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Method Details
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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- Specified by:
nextTuple
in classTuplePull
- 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
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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
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