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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.VariableReference
Variable reference: a reference to a variable. This may be an XSLT-defined variable, a range variable defined within the XPath expression, or a variable defined in some other static context.
| Field Summary |
| Fields inherited from class net.sf.saxon.expr.ComputedExpression |
locationId, staticProperties |
| Fields inherited from interface net.sf.saxon.expr.Expression |
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD |
| Constructor Summary | |
VariableReference()
|
|
VariableReference(VariableDeclaration declaration)
Constructor |
|
| Method Summary | |
int |
computeCardinality()
Get the static cardinality |
int |
computeSpecialProperties()
Determine the special properties of this expression |
VariableReference |
copy()
Create a clone copy of this VariableReference |
void |
display(int level,
java.io.PrintStream out,
Configuration config)
Diagnostic print of expression structure |
boolean |
equals(java.lang.Object other)
Test if this expression is the same as another expression. |
Item |
evaluateItem(XPathContext c)
Evaluate an expression as a single item. |
ValueRepresentation |
evaluateVariable(XPathContext c)
|
void |
fixup(Binding binding)
Fix up this variable reference to a Binding object, which enables the value of the variable to be located at run-time. |
Binding |
getBinding()
Get the object bound to the variable |
int |
getImplementationMethod()
An implementation of Expression must provide at least one of the methods evaluateItem(), iterate(), or process(). |
int |
getIntrinsicDependencies()
Determine the intrinsic dependencies of an expression, that is, those which are not derived from the dependencies of its subexpressions. |
ItemType |
getItemType(TypeHierarchy th)
Determine the data type of the expression, if possible |
int |
hashCode()
get HashCode for comparing two expressions |
SequenceIterator |
iterate(XPathContext c)
Get the value of this variable in a given context. |
Expression |
optimize(Optimizer opt,
StaticContext env,
ItemType contextItemType)
Type-check the expression. |
void |
process(XPathContext c)
Process the instruction, without returning any tail calls |
Expression |
promote(PromotionOffer offer)
Promote this expression if possible |
void |
refineVariableReference()
Replace this VariableReference where appropriate by a more efficient implementation. |
void |
setStaticType(SequenceType type,
Value value,
int properties)
Set static type. |
Expression |
typeCheck(StaticContext env,
ItemType contextItemType)
Type-check the expression. |
| Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
public VariableReference()
public VariableReference(VariableDeclaration declaration)
declaration - the variable declaration to which this variable refers| Method Detail |
public VariableReference copy()
public void setStaticType(SequenceType type,
Value value,
int properties)
setStaticType in interface BindingReference
public Expression typeCheck(StaticContext env,
ItemType contextItemType)
throws XPathException
typeCheck in interface Expressionenv - the static context of the expressioncontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPE
XPathException
public Expression optimize(Optimizer opt,
StaticContext env,
ItemType contextItemType)
throws XPathException
optimize in interface Expressionopt - the optimizer in use. This provides access to supporting functions; it also allows
different optimization strategies to be used in different circumstances.env - the static context of the expressioncontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPE
XPathExceptionpublic void fixup(Binding binding)
fixup in interface BindingReferencepublic void refineVariableReference()
public ItemType getItemType(TypeHierarchy th)
getItemType in interface Expressionth -
public int computeCardinality()
computeCardinality in class ComputedExpressionpublic int computeSpecialProperties()
computeSpecialProperties in class ComputedExpressionStaticProperty.NON_CREATIVE (unless the variable is assignable using saxon:assign)public boolean equals(java.lang.Object other)
public int hashCode()
public int getIntrinsicDependencies()
ComputedExpression
getIntrinsicDependencies in class ComputedExpression
public Expression promote(PromotionOffer offer)
throws XPathException
promote in interface Expressionpromote in class ComputedExpressionoffer - details of the offer, for example the offer to move
expressions that don't depend on the context to an outer level in
the containing expression
XPathException - if any error is detectedpublic int getImplementationMethod()
getImplementationMethod in interface ExpressiongetImplementationMethod in class ComputedExpression
public SequenceIterator iterate(XPathContext c)
throws XPathException
iterate in interface Expressioniterate in class ComputedExpressionc - the XPathContext which contains the relevant variable bindings
XPathException - if the variable is undefined
public Item evaluateItem(XPathContext c)
throws XPathException
ComputedExpression
evaluateItem in interface ExpressionevaluateItem in class ComputedExpressionc - The context in which the expression is to be evaluated
XPathException - if any dynamic error occurs evaluating the
expression
public void process(XPathContext c)
throws XPathException
ComputedExpression
process in interface Expressionprocess in class ComputedExpressionc - The dynamic context, giving access to the current node,
the current variables, etc.
XPathException
public ValueRepresentation evaluateVariable(XPathContext c)
throws XPathException
XPathExceptionpublic Binding getBinding()
public void display(int level,
java.io.PrintStream out,
Configuration config)
display in interface Expressionlevel - indentation level for this expressionout - Output destinationconfig -
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