net.sf.saxon.expr.flwor

Class TraceClause

java.lang.Object

net.sf.saxon.expr.flwor.Clause

net.sf.saxon.expr.flwor.TraceClause

public class TraceClause
extends Clause

A "trace" clause in a FLWOR expression, added by a TraceCodeInjector for diagnostic tracing, debugging, profiling or similar purposes.

Field Summary

Fields inherited from class net.sf.saxon.expr.flwor.Clause

COUNT, FOR, GROUPBYCLAUSE, LET, ORDERBYCLAUSE, TRACE, WHERE, WINDOW

Constructor Summary

Constructors

Constructor and Description
TraceClause(Clause target, NamespaceResolver nsResolver) Create a traceClause

Method Summary

Modifier and Type	Method and Description
void	addToPathMap(PathMap pathMap, PathMap.PathMapNodeSet pathMapNodeSet) Collect information about the navigation paths followed by this clause, for document projection purposes
TraceClause	copy(FLWORExpression flwor, RebindingMap rebindings) Create a copy of this clause
void	explain(ExpressionPresenter out) Diagnostic print of expression structure.
int	getClauseKey() Get a keyword identifying what kind of clause this is
NamespaceResolver	getNamespaceResolver() Get the namespace bindings from the static context of the clause
TuplePull	getPullStream(TuplePull base, XPathContext context) Get a tuple stream that implements the functionality of this clause, taking its input from another tuple stream which this clause modifies
TuplePush	getPushStream(TuplePush destination, XPathContext context) Get a push-mode tuple stream that implements the functionality of this clause, supplying its output to another tuple stream
void	processOperands(OperandProcessor processor) Process the subexpressions of this clause
void	setNamespaceResolver(NamespaceResolver nsResolver) Set the namespace bindings from the static context of the clause
java.lang.String	toString()

Methods inherited from class net.sf.saxon.expr.flwor.Clause

containsNonInlineableVariableReference, gatherVariableReferences, getConfiguration, getLocation, getPackageData, getRangeVariables, isRepeated, optimize, refineVariableType, setLocation, setPackageData, setRepeated, toShortString, typeCheck

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

TraceClause

public TraceClause(Clause target,
                   NamespaceResolver nsResolver)

Create a traceClause

Parameters:

target - the clause whose evaluation is being traced

Method Detail

getNamespaceResolver

public NamespaceResolver getNamespaceResolver()

Get the namespace bindings from the static context of the clause

Returns:

a namespace resolver that reflects the in scope namespaces of the clause

setNamespaceResolver

public void setNamespaceResolver(NamespaceResolver nsResolver)

Set the namespace bindings from the static context of the clause

Parameters:

nsResolver - a namespace resolver that reflects the in scope namespaces of the clause

getClauseKey

public int getClauseKey()

Description copied from class: Clause

Get a keyword identifying what kind of clause this is

Specified by:

getClauseKey in class Clause

Returns:

the kind of clause

copy

public TraceClause copy(FLWORExpression flwor,
                        RebindingMap rebindings)

Description copied from class: Clause

Create a copy of this clause

Specified by:

copy in class Clause

Parameters:

flwor - the new FLWORExpression to contain the copied clause

Returns:

the copied clause

getPullStream

public TuplePull getPullStream(TuplePull base,
                               XPathContext context)

Get a tuple stream that implements the functionality of this clause, taking its input from another tuple stream which this clause modifies

Specified by:

getPullStream in class Clause

Parameters:

base - the input tuple stream

context - the dynamic evaluation context

Returns:

the output tuple stream

getPushStream

public TuplePush getPushStream(TuplePush destination,
                               XPathContext context)

Get a push-mode tuple stream that implements the functionality of this clause, supplying its output to another tuple stream

Specified by:

getPushStream in class Clause

Parameters:

destination - the output tuple stream

context - the dynamic evaluation context

Returns:

the push tuple stream that implements the functionality of this clause of the FLWOR expression

processOperands

public void processOperands(OperandProcessor processor)
                     throws XPathException

Process the subexpressions of this clause

Specified by:

processOperands in class Clause

Parameters:

processor - the expression processor used to process the subexpressions

Throws:

XPathException - if any error is detected

addToPathMap

public void addToPathMap(PathMap pathMap,
                         PathMap.PathMapNodeSet pathMapNodeSet)

Description copied from class: Clause

Collect information about the navigation paths followed by this clause, for document projection purposes

Specified by:

addToPathMap in class Clause

Parameters:

pathMap - the path map in which the data is to be collected

pathMapNodeSet - the path map node set representing the paths to the context item

explain

public void explain(ExpressionPresenter out)
             throws XPathException

Diagnostic print of expression structure. The abstract expression tree is written to the supplied output destination.

Specified by:

explain in class Clause

Parameters:

out - the expression presenter used to display the structure

Throws:

XPathException

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object