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java.lang.Object
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+--net.sf.saxon.expr.ComputedExpression
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+--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(VariableDeclaration declaration)
Constructor |
|
| Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
Type-check the expression. |
int |
computeCardinality()
Get the static cardinality |
void |
display(int level,
NamePool pool,
java.io.PrintStream out)
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. |
Value |
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 |
getIntrinsicDependencies()
Determine the intrinsic dependencies of an expression, that is, those which are not derived from the dependencies of its subexpressions. |
ItemType |
getItemType()
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 |
promote(PromotionOffer offer)
Promote this expression if possible |
void |
setStaticType(SequenceType type,
Value value,
int properties)
Set static type. |
Expression |
simplify(StaticContext env)
Simplify the expression. |
| Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
public VariableReference(VariableDeclaration declaration)
declaration - the variable declaration to which this variable refers| Method Detail |
public Expression simplify(StaticContext env)
simplify in interface Expressionsimplify in class ComputedExpression
public void setStaticType(SequenceType type,
Value value,
int properties)
setStaticType in interface BindingReference
public Expression analyze(StaticContext env,
ItemType contextItemType)
throws XPathException
analyze 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
XPathExceptionpublic void fixup(Binding binding)
fixup in interface BindingReferencepublic ItemType getItemType()
getItemType in interface Expressionpublic int computeCardinality()
computeCardinality in class ComputedExpressionpublic boolean equals(java.lang.Object other)
equals in class java.lang.Objectpublic int hashCode()
hashCode in class java.lang.Objectpublic 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 detected
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 Value evaluateVariable(XPathContext c)
throws XPathException
XPathExceptionpublic Binding getBinding()
public void display(int level,
NamePool pool,
java.io.PrintStream out)
display in interface Expressionlevel - indentation level for this expressionpool - NamePool used to expand any names appearing in the expressionout - Output destination
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