Package net.sf.saxon.expr.flwor
Class LetClause
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- net.sf.saxon.expr.flwor.Clause
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- net.sf.saxon.expr.flwor.LetClause
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public class LetClause extends Clause
A "let" clause in a FLWOR expression
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Nested Class Summary
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Nested classes/interfaces inherited from class net.sf.saxon.expr.flwor.Clause
Clause.ClauseName
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Constructor Summary
Constructors Constructor Description LetClause()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description voidaddToPathMap(PathMap pathMap, PathMap.PathMapNodeSet pathMapNodeSet)Collect information about the navigation paths followed by this clause, for document projection purposesLetClausecopy(FLWORExpression flwor, RebindingMap rebindings)Create a copy of this clausevoidexplain(ExpressionPresenter out)Diagnostic print of expression structure.voidgatherVariableReferences(ExpressionVisitor visitor, Binding binding, java.util.List<VariableReference> references)Build a list of all references to a variables declared in this clauseClause.ClauseNamegetClauseKey()Get a keyword identifying what kind of clause this isEvaluatorgetEvaluator()TuplePullgetPullStream(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 modifiesTuplePushgetPushStream(TuplePush destination, Outputter output, XPathContext context)Get a push-mode tuple stream that implements the functionality of this clause, supplying its output to another tuple streamLocalVariableBindinggetRangeVariable()LocalVariableBinding[]getRangeVariables()Get the number of variables bound by this clauseExpressiongetSequence()voidinitSequence(FLWORExpression flwor, Expression sequence)voidprocessOperands(OperandProcessor processor)Process the subexpressions of this clausevoidrefineVariableType(ExpressionVisitor visitor, java.util.List<VariableReference> references, Expression returnExpr)Supply improved type information to the expressions that contain references to the variables declared in this clausevoidsetRangeVariable(LocalVariableBinding binding)voidsetSequence(Expression sequence)java.lang.StringtoShortString()Get a short string representation of the clausejava.lang.StringtoString()voidtypeCheck(ExpressionVisitor visitor, ContextItemStaticInfo contextInfo)Type-check the expression-
Methods inherited from class net.sf.saxon.expr.flwor.Clause
containsNonInlineableVariableReference, getConfiguration, getLocation, getPackageData, getTraceInfo, isRepeated, optimize, setLocation, setPackageData, setRepeated
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Method Detail
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getClauseKey
public Clause.ClauseName getClauseKey()
Description copied from class:ClauseGet a keyword identifying what kind of clause this is- Specified by:
getClauseKeyin classClause- Returns:
- the kind of clause
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getEvaluator
public Evaluator getEvaluator()
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copy
public LetClause copy(FLWORExpression flwor, RebindingMap rebindings)
Description copied from class:ClauseCreate a copy of this clause
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initSequence
public void initSequence(FLWORExpression flwor, Expression sequence)
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setSequence
public void setSequence(Expression sequence)
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getSequence
public Expression getSequence()
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setRangeVariable
public void setRangeVariable(LocalVariableBinding binding)
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getRangeVariable
public LocalVariableBinding getRangeVariable()
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getRangeVariables
public LocalVariableBinding[] getRangeVariables()
Get the number of variables bound by this clause- Overrides:
getRangeVariablesin classClause- Returns:
- the number of variable bindings
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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:
getPullStreamin classClause- Parameters:
base- the input tuple streamcontext-- Returns:
- the output tuple stream
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getPushStream
public TuplePush getPushStream(TuplePush destination, Outputter output, XPathContext context)
Get a push-mode tuple stream that implements the functionality of this clause, supplying its output to another tuple stream- Specified by:
getPushStreamin classClause- Parameters:
destination- the output tuple streamoutput- the destination for the resultcontext-- Returns:
- the push tuple stream that implements the functionality of this clause of the FLWOR expression
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processOperands
public void processOperands(OperandProcessor processor) throws XPathException
Process the subexpressions of this clause- Specified by:
processOperandsin classClause- Parameters:
processor- the expression processor used to process the subexpressions- Throws:
XPathException- if any error is detected
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typeCheck
public void typeCheck(ExpressionVisitor visitor, ContextItemStaticInfo contextInfo) throws XPathException
Type-check the expression- Overrides:
typeCheckin classClause- Parameters:
visitor- the ExpressionVisitor, providing access to static context informationcontextInfo- static information about the dynamic context- Throws:
XPathException- if any error is detected
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gatherVariableReferences
public void gatherVariableReferences(ExpressionVisitor visitor, Binding binding, java.util.List<VariableReference> references)
Description copied from class:ClauseBuild a list of all references to a variables declared in this clause- Overrides:
gatherVariableReferencesin classClause- Parameters:
visitor- the expression visitorbinding- a variable declared in this clausereferences- the list of variable references, initially empty, to which the method will append
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refineVariableType
public void refineVariableType(ExpressionVisitor visitor, java.util.List<VariableReference> references, Expression returnExpr)
Description copied from class:ClauseSupply improved type information to the expressions that contain references to the variables declared in this clause- Overrides:
refineVariableTypein classClause- Parameters:
visitor- the expression visitorreferences- the list of variable referencesreturnExpr- the expression in the return clause
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addToPathMap
public void addToPathMap(PathMap pathMap, PathMap.PathMapNodeSet pathMapNodeSet)
Description copied from class:ClauseCollect information about the navigation paths followed by this clause, for document projection purposes- Specified by:
addToPathMapin classClause- Parameters:
pathMap- the path map in which the data is to be collectedpathMapNodeSet- the path map node set representing the paths to the context item
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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:
explainin classClause- Parameters:
out- the expression presenter used to display the structure- Throws:
XPathException
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toShortString
public java.lang.String toShortString()
Description copied from class:ClauseGet a short string representation of the clause- Overrides:
toShortStringin classClause- Returns:
- a recognizable string
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toString
public java.lang.String toString()
- Overrides:
toStringin classjava.lang.Object
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