Package net.sf.saxon.expr.flwor
Class DiagnosticClausePull
- java.lang.Object
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- net.sf.saxon.expr.flwor.TuplePull
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- net.sf.saxon.expr.flwor.DiagnosticClausePull
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public class DiagnosticClausePull extends TuplePull
Implements the trace clause in a FLWOR expression. This is a Saxon extension that displays the value of a user-specified expression as the tuple stream is evaluated
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Field Summary
Fields Modifier and Type Field Description (package private) TuplePull
base
(package private) DiagnosticClause
diagClause
(package private) int
tupleSeq
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Constructor Summary
Constructors Constructor Description DiagnosticClausePull(TuplePull base, DiagnosticClause diagClause)
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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 releasedboolean
nextTuple(XPathContext context)
Move on to the next tuple.
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Field Detail
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base
TuplePull base
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diagClause
DiagnosticClause diagClause
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tupleSeq
int tupleSeq
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Constructor Detail
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DiagnosticClausePull
public DiagnosticClausePull(TuplePull base, DiagnosticClause diagClause)
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Method Detail
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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 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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