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java.lang.Object | +--net.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(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 refersMethod Detail |
public Expression simplify(StaticContext env)
simplify
in interface Expression
simplify
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 Expression
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
XPathException
public void fixup(Binding binding)
fixup
in interface BindingReference
public ItemType getItemType()
getItemType
in interface Expression
public int computeCardinality()
computeCardinality
in class ComputedExpression
public boolean equals(java.lang.Object other)
equals
in class java.lang.Object
public int hashCode()
hashCode
in class java.lang.Object
public int getIntrinsicDependencies()
ComputedExpression
getIntrinsicDependencies
in class ComputedExpression
public Expression promote(PromotionOffer offer) throws XPathException
promote
in interface Expression
promote
in class ComputedExpression
offer
- 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 SequenceIterator iterate(XPathContext c) throws XPathException
iterate
in interface Expression
iterate
in class ComputedExpression
c
- the XPathContext which contains the relevant variable bindings
XPathException
- if the variable is undefinedpublic Item evaluateItem(XPathContext c) throws XPathException
ComputedExpression
evaluateItem
in interface Expression
evaluateItem
in class ComputedExpression
c
- The context in which the expression is to be evaluated
XPathException
- if any dynamic error occurs evaluating the
expressionpublic Value evaluateVariable(XPathContext c) throws XPathException
XPathException
public Binding getBinding()
public void display(int level, NamePool pool, java.io.PrintStream out)
display
in interface Expression
level
- indentation level for this expressionpool
- NamePool used to expand any names appearing in the expressionout
- Output destination
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